Uicollectionview reload without scroll. Ask Question Asked 11 years ago.

Uicollectionview reload without scroll For more flexibility, you can subclass UICollectionViewLayout to create advanced There are two methods for dequeueing views. yourCollectionView. 4. Trying to reloadData and then performing an animated scroll to a new position makes sense (and seems to work) as long as the reload makes the collection bigger. Diffable data source changes. itemIdentifier(for: indexPath) else { UICollectionView: reload data, without removing an in-cell animation. Wrapping code you want executed after your cells are loaded in dispatch_async(dispatch_get_main and calling that after your call to reloadData will achieve Hi John, thanks for the response. I need the user to scroll through all the cells Next / Back without considering the selected one – kAiN. Initially I fetch only 100 messages. So the cells aren't actually loaded (cellForRowAtIndexPath: isn't called) after reloadData returns. How do you scroll to the bottom of a UICollectionView? 28. The below works fine if I want to scroll to the bottom when the status bar is touched. But you can call right afterwards and it'll force a scroll to top with or without animation : collectionview. As the user scrolls, I fetch some more messages and then reload the collection view. As a recap, for references type items, we can leverage the snapshot’s reloadItems(_:) method If you just want to reload a single item, update your data source's data and then call reloadItems(at:) passing in the index path for the item. inside tableview's row I have horizontal scrolling UICollectionView. When I scroll down the collectionViewController, the collectionView cells of the the header collecti (UICollectionView *)collectionView { return 1; } - (NSInteger)collectionView:(UICollectionView 90 days in Switzerland. I must say that personally I don't This year at WWDC, some significant improvements and changes were announced for UICollectionView and UITableView. First, the scrolling is too laggy. 7. I want clear UICollectionView during each game without loading UIViewController again. Ask Question Asked 7 years, 2 months ago. firstIndex(of: current) { collectionView?. How can I resize the cell size of UICollectionView without reload methods? Just want to call following method on some event. Modified 6 years, 6 months ago. If you want to preserve UICollectionView scroll position when you fetch new items, it is better to insert the new items instead of reloading the entire section (or maybe the entire I want to made "infinite scroll" in both directions (up and down) that will show weeks with dates. Another option, if a cell is currently Using [MSCollectionViewCalendarLayout invalidateLayoutCache] won't do any good because it's slow and it breaks the scrolling to date function of the custom layout. I tried expanding the view inside but it didn't work. scrollToItem(at: IndexPath(item: idx, section: 0), at: . collectionViewLayout. Here are my codes: Here is the Model: import UIKit class AppCategory: NSObject { var name: String Which law(s) bans Diffable UICollectionView without fade animation on reload UI Frameworks UIKit UIKit You’re now watching this thread. I am attempting to update a single cell inside a UICollectionView, specifically I am just trying to update an image in that specific cell detonated by cell. pagingEnabled =YES. I want the CollectionView to adjust scroll position with animation. dataSource = self collectionView. I'm quite new to programming so i expect i have many things wrong, but that's how we learn. Unilateral Direction Scrolling in a UICollectionView? 3. That's how you reload a cell for a given index path. The collectionview scroll to the first page,But I want collectionView still keep the second page. I show my content in view I want when I tap on a cell it should expand like showed in the image below but without reloading the UITableView. Ask Question Asked 6 years, 10 months ago. Since the addition of the UIRefreshControl class in iOS 6, pull-to-refresh has become very easy to add to table views, collection views, and even scroll views. This is happening without animation. The problem is when the reload data is called the collection view only call . I turned scrolling off - I want to see ALL of the cells in the collection view without scrolling. invalidateLayout(), a weird height to cell is added. Basically I cannot figure out how to simply update the current cells without having a problem. 2 and i have a collectionview inside cell ia hve a label. First, the reload operations are performed without animation because no cell movement is involved: I had many original png sizes before, and it was very choppy when png original size was greater than ~1000x1000 (many crashes on first scroll). UI collection view not displayed in iOS 7. My custom UICollectionViewCells are of size 200x200. The collectionview consists of 10 cells. I would like to scroll to Item then insert it with custom animation but if I scroll to Item before inserting it the app crash. In this function I want to get the indexpaths, indexPathsForVisibleItems, that are This causes the collection view to discard any currently visible items and redisplay them. – I'm trying to figure out how to scroll all the way to the bottom of a UICollectionView when the screen first loads. Made the height of UICollectionView with +2 pixel than the height of the cell. collection-view cell two button and one UIView was designed. Thanks! Edit: I managed to disable scrolling and it worked. item == 0) and tutorialCell (all other cells) which has a tableView and can scroll its content vertically. This is a LazyTable solution from Apple , and everythings work on tableview but for CollectionView Image only CollectionView Image only apear if i scroll. Follow answered Oct 13, 2016 at 20:31 UICollectionView scroll issue with paging enabled after tap. Click again to stop watching or visit rather than the expected reload action type. when a user clicks on the correct cell, I draw another imageView in that cell (a correctCircle let's call it). This is my cellForItemAtIndexPath -setCollectionViewLayout: or -setCollectionViewLayout:animated: won't cause your UICollectionView reload its data. - (NSInteger) collectionView:(UICollectionView *)collectionView Auto layout has special behavior for scroll views. Scroll down on a CollectionView in iOS; Tap the status bar; The CollectionView should scroll to the top but it does not; Link to public reproduction project repository That's not a bug. At this stage the system will consider the large I have a probem when trying to reload a UICollectionview in iOS. Not answered yet by anybody. Ask Question Asked 4 years, 7 months ago. Objective-C UICollectionView Scroll Up/Down. Apple introduced a better way to reload a cell in WWDC21. Note:- I am not loading images from any link(API), It is from images. It seems, UICollectionView uses the estimated size to calculate the items to load in first view. but only a few that fills the size of the screen and when you scroll down the list these items are going to be reused to display your elements. 0; NSInteger count = [self I'm using a UICollectionView to scroll through a set of thumbnails quickly. The structure of the three classes is below. constraintTableViewHeight. Can anyone provide any pointers? Also I cannot scroll the view if there are more cells that will fit in the view. My code almost works without setting contentInset, but setting the contentInset seems prevent any scrolling from happening - (void)viewDidLayoutSubviews { [super viewDidLayoutSubviews]; CGFloat itemWidth = self. I've also set a UIRefreshControl for the UICollectionView which applies a NSDiffableDataSourceSnapshot when I pull down to refresh. Subclass UICollectionViewFlowLayout To Refresh On Rotation. (Imaging old MS solitaire card dealt) I've searched around for "custom UICollectionView reload animatation" and seen solutions such as I am wondering why my collection view automatically load data without calling imageCollectionView. viewDidLayoutSubviews() // Scroll to currently opened outline if let current = currentPage, let idx = pages?. stopAnimating() The code below gets called from my collection view and prints out 50 cells starting with the label of count 0 to count 49. Cell prefetching is enabled by default. Each is populated with a name from an array. How to make UICollectionView scroll from bottom for chat application after reload data? Related. Then when reusing outer collection view cells you can reset the scroll position in collectionView(collectionView:, cellForItemAt indexPath:) method. horizontal Before inserting the items, I calculate the indexPath of currently visible items AFTER the insertion (adding the number of inserted items) and scroll to that index without animation in the completion block of the batch update. If the level is unlocked the cell displays the level (a custom UIView), else it displays an image. The cell kind of blinks when it reloads. It should reload the whole collection view but it does not do it. UICollectionView scrollToItemAtIndexPath. 0. But what about animation? ReloadData method I am trying to follow the following post on reload a cell in a UICollectionView: UICollectionView update a single cell. That means if you're at the bottom of a 30 element scrollview, it'll stay at the bottom. If you only want to update the layout you can also try [self. Make I am trying to update the content of the cells in a UICollectionView based on what the user inputs into a textField in the header. I used scrollViewDidScroll for detecting the moment when I need to update my data source If you’re appending new data to your existing array without ensuring that the UICollectionView is reloading correctly, you might end up displaying the same items multiple To lay out UICollectionView cells in a simple grid, you can use UICollectionViewFlowLayout directly. If you want to change your cell style or update the data, call [self. I am going to invoke reloadData method to reload the whole collection view to fit my needs. Here is code for UICollectionView: I have a UICollectionView within a UIViewController with paging enabled. So your data is duplicate. Modified 4 years, 7 months ago. I have download sample project of UICollectionVIew. I scroll my collection view to the top and would like to perform an action once the scrolling is finished. Viewed 43k times Part of Mobile Development Collective UICollectionview horizontal scroll single cell not reloading. This should be the accepted answer b/c OP asked "scrolling has stopped" -- without both methods in place the user can easily scroll the collection view down and release finger without flicking and Im having a hard time to make UICollectionView Images load after data getting parsed. scheduledTimer(timeInterval: kAutoScrollDuration, target: self, selector: #selector(self. Maintain scroll position in UICollectionView when scrolling up. This only works if I delay the scrolling, but then it flickers, because it's first scrolling up a little UICollectionView reload data Issue; ios UICollectionView cells not refreshing after scroll; UILabel overloading in UICollectionView; I have a CollectionView with custom UIViews in the cell, On reloadData its re-adding the custom UIViews and not removing the ones already being shown. I'm able to scroll to the bottom when the status bar is touched, but I'd like to be able to do that automatically when the view loads as well. CollectionView: Changing scroll direction of each section individually. Running this on a I see two ways, first: load a really big data to data source array and just scroll without frequent collection view reload. In result of so many reloads/view updates my collection view is not scrolling smoothly. myCollectionView reloadSections:[NSIndexSet indexSetWithIndex:0]]; to refresh the collectionview and it shows all cells, you can try it. xcassets file or supporting Files. Modified 6 years, As I don't want to refresh every time the collection view scrolls this falls under the "do some So to update the data i reload collection view cells on corresponding response and the same for banner and bottom views. However, calling prepareLayout directly between invalidate and reload causes the sizes to be recalculated during reload as I would expect reloadData now enqueues the loading of the cells on the main thread (even if called from the main thread). I have a simple UICollectionView with the cells in a grid. This should be unnoticeable. For some strange reason collectionView. reloadDataForCollectionView = { [weak self] completed in DispatchQueue. UICollectionViewCell Only Updates After Scrolling. So how Prior to this, reloading a table or collection view cell can be easily done by calling one of the following functions: reloadRows(at:with:) // For reloading table view cell The current scroll position of UICollectionView will be reset, after calling collectionView. Go read Technical Note TN2154: UIScrollView And Autolayout. I'd set the estimated size too high which was resulting in wrong calculations for number of items to load in first screen. When scrolling programmatically, just set the end contentOffset. I have 2 types of Collection View Items: welcomeCell which is always a first and single cell in Onboarding (indexPath. Thus, though I managed to assign all the properties to my UICollectionViewCell class that I get from the server, once I run the project the data will not appear on cells unless I scroll my UITableView. [self. scrollDirection = . Reload to refresh your session. A UISearchBar should be placed at the very top of the collectionView and scroll with its content. After each click (wait 2 secs) the question should be updated, I have a function that To trigger an automatic reload of headers your Section object should be Hashable and should have all the necessary properties stored to create a unique hash for the Section. If you want to change your UICollectionView layout to another, call With some help from @NicholasHart, I think I understand the problem. override func viewDidLayoutSubviews() { super. How can I accomplish this? See code below. delegate = self collectionView. When reloading shrinks the collection, however, the starting point for an animated scroll might not exist anymore. Once delayed and once without delay. When Normally a UICollectionView has no transition effects when you scroll from one item to another. Can we obtain the power set of a finite set without the Axiom of Power Set? more hot questions Question feed Subscribe to RSS Question feed To subscribe to this If the server has new data, I need to insert it at the beginning of the array datasource since it is the newest data. When you do, I'll look and update my answer. – Jelly. Wanna do it in viewWillAppear() method. The animation jumps when applying the snapshot (note this happens even when the navigator bar title isn't large. UICollectionView scrolling changes the selected cells. I'd like to reload UICollectionView with some interesting animation. from page 1 I would recommend doing it in collectionView: willDisplay: Then you can be sure that the collection view delegate delivers something. I think your problem is that viewModel. collectionViewLayout invalidateLayout] instead of . About; Products OverflowAI; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; When I scroll down the UICollectionView very fast, and press "refresh" while the Collection View is still scrolling, I've got "cell leftovers" which do not belong to anybody and just stay on the screen. main. If you’ve opted in to email or web notifications, you’ll be notified when there’s activity. Its height should be equal to total of all UICollectionViewCells. Actually I personally up voted recent 2 answers cause i find it working but in my case, this is Need to reload the collection view on each scroll end (Not a big deal if the visible cells are minimal). Flickering issue with UICollectionView while reloading. How to do that ? So, I tried finding a more cleaner way to achieve this and I came up reloading the whole UICollectionView after the performBatchUpdate (completion block) and it is working great. Commented Oct 13, 2016 at 13:46. bounds. 3. The problem I am having is that when I scroll up/down the scroll is really choppy and thus not a very good user experience. Commented Apr 16, 2016 at 17:33. Ask Question Asked 6 years, 6 months ago. How to maintain the scrolling speed after reloading the UICollectionView so user doesn't feel jerk? Because you reused UITableViewCell so you must alway reload your UICollectionView. It doesn't really affect the user scrolling and I made it almost unnoticeable with: UICollectionView: reload data, without removing In my case (vertical scroll, with cells disappearing in first view), cells were disappearing due to incorrect estimated size. var data = [DataModel]() override func viewDidLoad() { collectionView. Prior to iOS 15, we can reload a cell with reference type item using the snapshot’s reloadItems(_:) method like so:. I am using a collection to delete a item I am just deleting an item from datasource and then reloading the CollectionView. It won't let me scroll further before it bounces back up. So my question is how can I reload the UICollectionView to let it shows only the selected indices without generating a new array that contains the selected UIImages (indices). But in UICollectionView there's just reloadSections. reloadRows(at: [IndexPath(row: index, section: 0)], with: I have a collection view and when something changes I update the data source and reload the cell in which the change occurs. 1 and Xcode 8. Cell without problem only Images gives me a trouble. Details described in Advanced Scroll View Tech I have to trigger the download processes for all cells which are all visible and non visible without scrolling the collection view. Clearing SortDescriptions and adding them again manually I'm using swift 2. zero, animated: true) objective-c [yourCollectionView setContentOffset:CGPointZero animated:YES]; Share. Right now I accomplish this by inserting a section above my current section, but it actually inserts, scrolls up, and then I have to manually scroll down. Whenever user double tap on the collection view's cell it sends event back to the viewcontroller to update the datasource. The problem is that the lower I scroll - the slower the like button changes its color when tapped on. Im using UICollectionView for my project. reloadData() or collectionView. UICollectionView scroll outside it's view. x to 1 pixel more/less than it should. Ask Question Asked 11 years ago. Can I exit/enter at airport without You should watch the WWDC 2011 session video "Advanced ScrollView Techniques", they talk about infinite scrolling, and I'm pretty sure it's possible to use that with UICollectionViews. contentSize. 27. Introduction. When you lay your view out in story board, you can put your UICollectionView embedded in a UIScrollView. performWithoutAnimation { self?. Learn how to use UICollectionView, with highly reusable UIKit I have created a User Onboarding as a Collection View with 5 cells (pages). This might affect you drastically if you're loading something asynchronously without caching (Which is a bad practice and data should be cached outside the cells) Doesn't work if you want infinite scroll in both directions Reloading Reference Type Items. Once I UICollectionView Reloading cells but not deleting old ones. UICollectionView, scrolling to an Item without knowing its NSIndexPath. reloadSections(NSIndexSet(index: 1), withRowAnimation In my application UICollection scroll horizontally. I then need to refresh the UICollectionView so that it knows new data has been inserted in the beginning / at the top. width/3. here is a reload I am able to load Images in UICollectionView, using following code, but the problem is, It will load images after the screen is Scrolled. Viewed 419 times Part of Mobile Development Collective 0 I have a view that's a collection view subview. height or Without those methods given, you won't have much luck here. You signed out in another tab or window. UICollectionView scroll to item at Index. 2. cellForItemAtIndexPath. Is this there something I'm doing wrong or is this supposed to happen? //Test scrollToItem func collectionView(_ collectionView: After going through the solutions here on STO and other blogs, none seem to truly fix the UICollectionView issues others definitely seem to still have to this day! Avoiding the reload functions initially loads the CollectionVC with no issues and scrolling down to the bottom no issues as well, but the moment I scroll up, random cells go missing. And in completion block set it to actual value. Could anyone suggest a good way to get data from apis and load into collection view and other views without affecting user interaction. collectionView beginUpdates] is not a thing in a Hi Timothy, cellForRowAtIndexPath loads the cells that are visible in the view, in my case the first nine. Here i attached the collectionview image: Here my code: I'm working on an app that has a UICollectionView with an infinite scroll. Scroll down on a CollectionView in iOS; Tap the status bar; The CollectionView should scroll to the top but it does not; Link to public reproduction project repository To lay out UICollectionView cells in a simple grid, you can use UICollection View Flow Layout directly. Can we obtain the power set of a finite set without the Axiom of Power Set? Why does one have to avoid hard braking, full-throttle starts and rapid acceleration with a new How do I make UICollectionView scroll horizontally within UIScrollView; If adding UICollectionView inside UIScrollView is not a good idea, what component do I use for the layout I want to achieve? (if you can just help with the idea) How to temporarily disable a primary IP without losing other IPs on the same interface Is it a "shifting of the burden of proof" if I show I have an UICollectionView and a custom UICollectionViewCell to display my content, which should be refreshed every second. It recenters while you scroll, and places the new items after the current visible items (or before, depending on the scroll direction). The problem was as I have made a collection view with cells arranged in rows in columns using a great tutorial. And it i also had similar problem , i just replaced [self. Stack Overflow. viewModel. It works great when collection view loads for first time, however when I try to reload the collection view using either collectionView. To maintain the scroll position I set the content offset but scrolling gets stopped. However you can accomplish this very easily without creating a custom layout or using a third party library. (Side note: you do this by disabling scrolling within the UITextView since it is already inside of another scrollable view). That's why all Section objects and Item objects should be Hashable and they should return a unique hash to allow DiffableDataSource to manage their reload only if their values were I have a weird issue in iOS 12 when using solution as explained here. So, a constraint between the edge of a scroll view and a descendant of the scroll view affects the scroll view's content size. the other data like label or other apears on. Viewed 900 times Part of Mobile Development Collective 0 My app is listening to a socket event which tells it when there's been an update to the data which is currently being displayed by the collectionView on screen. Thanks. if we have a callectionview in out tableviewcell then reloading cause callectionview scroll reset what we can do in this situation if we use begin and I've added a UICollectionView as a subview to my ViewController. I found the method reloadSections:, but I don't know why it doesn't work. Is there any way to initiate download for all the cells without scrolling? I am using UITableView in one of my app. itemIdentifier(for: indexPath) else { Cell rendering is therefore spread across multiple layout passes, resulting in a smoother scrolling experience. I am using it to display levels in a game. The default implementation returns false, or, if the size and origin change, it returns true. If you app only need to support iOS 15 and above, you can proceed to this article: Table and Collection View Cells Reload Improvements in iOS 15 In iOS 13, Apple introduced diffable data source and snapshot, defining the modern era of table view and collection view. I have EU residency and never got any stamps in passport. It seems like the image below. 0 var timer = Timer. viewDidLayoutSubviews() let layout = UICollectionViewFlowLayout() layout. This all works fine, but the problem is that an animation happens and it is noticeable to the user. Have the scrollview set up to scroll horizontally and the I have a collectionView and I have two problems. collectionView reloadData] and UICollectionViewDataSource protocol methods will be called. 1. imageView. I think for some performance reason or it is something else. When I used to reloadData() it updates only visible cells, the remaining cells will update after scrolling down. When scrolled to the bounds, reload the data and scroll the collectionView to the center. I'm trying to create an UICollectionView which can scroll horizontally and vertically. So how do I resize an UICollectionView depending on its cells. I have added a button to a toolbar in the main view controller that calls collectionView. Ideally I would like for the user to press the like button and nothing else to happen besides that button turning to "Unlike" and the number of Make a UICollectionView infinitely scrolling by looping through content - masonlamy/infinite-uicollectionview. Learn how to use UICollectionView, with highly reusable UIKit components and some MVVM pattern without the going nuts with index path calculations. See comment Why func collectionView(collectionView: Why func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout same collectionviewcontroller but Based on Mr. But, but, My collection view cell blinks every time I reload data. There are lots of ways to write animations for UICollectionView, but using a UICollectionViewLayout subclass is by far the simplest one. Each cell has a like button. But what about animation? ReloadData method In iOS 13, Apple introduced a major update to the UICollectionView API: UICollectionViewDiffableDataSource. count >= 4 { activity. I have created custom cell in code and in that cell I am adding UI elements UICollectionView reloads data but doesn't display new cells. I have looked at other similar questions here but none of their answers have seemed to work. I want to clear UICollectionView because my images overlap if don't have clear UICollectionView in new game. Each cell loaded two button. If you use refreshNow to reload UICollectionView, at the cell have refreshNow = false, UICollectionView will display like cell that it 's reused => wrong Udate rep: See , in picture uitableviewcell 1 will reuse at index 6. When I use reloadData method, header and footer section also reloads, so that's what I want. g. So I select 90x90 (or the like) on the UICollectionView and display the original pngs (no matter the size). UICollectionView CellForItemAtIndexPath not getting called. (ex: Image 1 of the album) I don't understand what's happening because in my refresh method I have: The moment you configure your collection view or reload it, you need to add a timer for autoscrolling. reloadData() } } } Delete cell from UICollectionView without reloading from top [closed] Ask Question Asked 11 years, 8 months ago. Everything loaded as expected without any scrolling! Share. The best way to implement rotation support is to subclass UICollectionViewFlowLayout and override shouldInvalidateLayout. Often users can update this list by using Pull-to-Refresh technique or by pressing the update button. The problem is that when I keep adding cells and I reach the bottom row, I can only see part of the 200x200 cell. . let kAutoScrollDuration: CGFloat = 4. ViewController. If the collection data shrinks as a result of the reload, the collection view adjusts its scrolling offsets accordingly. SetContentOffset(CGPoint. When i start scrolling, the upcoming cells wont be filled in, instead scrollViewDidEndDragging is called, which will call loadImagesForOnscreenRows, like in tableviews. Here are my codes: Here is the Model: import UIKit class AppCategory: NSObject { var name: String? var apps: [App]? Which law(s) bans medical exams without a prescription? How to interpret odds ratio for variables that range from 0 to 1 Has the UN ever made peace between I'm trying to reload only data section, not header or footer (supplementary view), of UICollectionView. invalidateLayout(). myProfileCollectionView. top, animated: false) // In order to only run the scroll once, without locking the view I am reloading a tableView section using this code - self. I can't use collectionView. This works fine. Last Cell in UICollectionView is clipped. Two seconds of my app. Jump Start To speed things up, I created an Xcode project that fetches This code works well in Swift 3. Hot Network Questions Did Superdana manufacture a 66 AC outlet power strip/surge protector? Configure Linux to regularly sync cached data to disk Wouldn't the ban of TikTok violate freedom of speech? Can you make 5 x 3 “magic” rectangles? Hollow shape produced by Geometry Nodes is filled That said, when the user taps a new color, say purple (and resets the defined rString, bString & gString) after selecting 3 cells and making them green, I want to reload the color they're using without wiping the initial 3 selected green cells from the Collection View. Improve this answer. – vikingosegundo. setContentOffset(CGPoint. reloadData() self. UIcollectionview Load Favorites Favorites count: 1 Reload CollectionView Get number of section, 1 The datamodel has 1 item, reloading CollectonView, cellForRowAtIndex not called? Selecting another tab, random which, then heading back to the CollectionView tab, without changing any data. nextPage), userInfo: nil, repeats: true) RunLoop. I even tried implementing an extension to the UICollectionView which goes through each cell in the section trying to reload its data but that I have a UICollectionView with size: 768x1024 with a navbar on top. Xamarin iOS collectionView reloadData not As others have already said, the UICollectionView can only scroll one direction using a flow layout. Now we come to the part as to how they have managed the infinite flow, and trust me my friend, it took me It'll reload it all shouldn't do any scrolling. It is possible that the reloadData hasn't completed for the call without delay to have any indexpaths to work with. reloadData() for my scenario. constant = self. How do I refresh the view? Is there something wrong with the way I am dequeuing the cell? I would like to animate the reload of a collection view such that when a cell is selected I get an animation similar to dealing cards in a solitaire game. Zero, false); i also had similar problem , i just replaced [self. UICollectionView: reload data calls numberOfItemsInSection but not cellForItemAtIndexPath. Everybody knows how to update UITableView by calling the reloadData method on the tableView instance. myCollectionView reloadData] with [self. I do not want to reload UICollectionView or any of its section or row. Ask Question Asked 9 years, 6 months ago. I know that I ultimately want something that looks like this: [self. You should watch the WWDC 2011 session video "Advanced ScrollView Techniques", they talk about infinite scrolling, and I'm pretty sure it's possible to use that with UICollectionViews. I want to change a label text value in UICollection view on a button click without using reloading whole uiCollection view. Horizontal and Vertical infinite scrolling feature for UICollectionView with Paging, NSProxy delegate, Reactive extension, SectionModel & AnimatableSectionModel support - arnauddorgans/Infi Skip to content UICollectionview scroll buttom to refresh. Creating a button to scroll UICollectionView. Here my example: func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) { /// this is done to set the index on start to 1 to have at index 0 the last image to I once encountered this problem and asked once. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I have an UICollectionView and a custom UICollectionViewCell to display my content, which should be refreshed every second. Inside the Label I add a button whose background is an image. numberOfSections can be called at any time and must return a value consistent with other operations you are planning on the collection view. Reusing own code at work without losing licence Let's say I have a UICollectionView that displaying array of UIImages and the user can select multiple images. Modified 9 years, 6 months ago. Without Scroll it will just display only Empty Cells. Tables and collections have nearly identical APIs for diffable data sources. when user click one button the particular cell should be reload and the UIView will be displayed in that cell only other cell not displayed. I have a complex list view (each row contains another sub-listview) and when I call Refresh(), selection in sub-rows disappears. Modified 6 years, 10 months ago. I want to add the next behaviour: user scrolls tableView content I'm working on a project in swift 3 and it contains a UICollectionView inside a UITableView. NSCollectionView How to scroll to selected item. numberOfSections returns 11 before you have called the update closure, which means that you have an inconsistency when you insert the sections. After updation of datasource I am reloading that particular row using : tableView. Strange behavior when user scrolls the list of UIViewCollectionCells in my app (the data in each cell changes randomly) 0. UICollectionView not refreshing. The workaround what i did is making the CollectionView height adjust such that the cell will be visible properly. I have a UICollectionView of 20 cells with an imageView inside of them. 2. Just to update one label in a particular item in I am implementing a chat app using UICollectionView. This is my code: - (NSInteger)collectionView: please give the code for how you are calling the reload data and scroll. reloadData(). You switched accounts on another tab or window. Scroll UICollectionView to bottom. Does anyone know how can I Prevent If you'd like to perform some code after your collectionView has completed it's reloadData() method, then try this (Swift): self. Commented May 17, 2019 at 11:43. UICollectionView It works but the animation is kind of glitchy and the scroll happening at the same time. – Ajeet. Bean's answer, here is an elegant way using UICollectionView extension: but you do not need that if you scroll without animation and the timer loop is really small and also the value you increment with is small it should look smooth. What is the right thing to do here? Thanks Updated: 16 June 2021. Hot Network Add this piece of code after reloading the collection view: swift. Data prefetching provides a mechanism whereby you’re notified of the data requirements of a collection view in Is it possible to 'refresh'(update) a view without explicit Refresh() method call? The problem is that it recreates a whole collection, and on UI, selected row becomes unselected. frame height was not correct - I'm pretty sure my math is. Most of our apps present lists or grids of some data by using UITableView or UICollectionView. Is there any way to achieve this easily? UICollectionView: Scroll to top and perform action when scrolling finished. Using UICollectionView I add a Label to a cell as a subView with the scroll direction set to horizontal. Note: I removed all the subviews from UICollectionView like below, but it didn't work After a lot of R&D I have come up with an answer for you, and the answer is :-RSDayFlow which is developed using DayFlow I have gone through most of the part of it and I recommend, if you want to make calendar app, use the DayFlow Library, its good. I want a do it without using it. ) Here are the relevant snippets of code If you want to keep the scroll position for each horizontal collection view you must keep an array of scroll positions in your UIViewController and update it when inner collection view gets scrolled. func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { // Get selected hero using index path guard let selectedHero = dataSource. UICollectionView scroll to specific section. The content of the cells depends if a level is unlocked. collectionView reloadData] is not really an option because it makes the whole collection view flash. iOS UICollectionView subview pan move without scrolling. While there are plenty of guides and technical how-to’s out there when it comes to UIKit’s UICollectionView (introduced in iOS 6!), there aren’t a ton that I’ve seen that Delete Cell from UICollectionView Without Reloading. async { UIView. In UITableView there's a method called reloadSections:withRowAnimation. A constraint between the edge of a scroll view and a view outside the scroll view affects the scroll view's When I am reloading the CollectionView, I want to reload it without the animation. collectionView. Steps to Reproduce. register(UINib(nibName: "MyCell", bundle: nil), forCellWithReuseIdentifier: "MyCell") getData() } func getData() { someAsyncMethodToGetData() { (data) in // Using CloudKit so I think this is necessary, but tried it with and without Initially I fetch only 100 messages. addTimer(timer, forMode: I use UIPageControl and make UICollectionView. tableView. In the screenshot, you can see the bottom row being cut off, I'm trying to find out why (I spent all day on trying to figure out why collectionView. Background I try to implement an infinite scroll feature. You can watch 10252: Make blazing fast lists and collection views for all the details, but I want to highlight some of them here. So I need to measure the time it takes to perform the scrolling. for the second list and for the last index in the second list. For some odd reason if I scroll the view in one direction and then come back the buttons image seems to either have left remnants to the right of the button. What I have tried till now. But i get some issue with it: cellForItemAtIndexPath is not working when i call reloadData and scroll. 3. scroll to the second page, and tap a button which will call 'reloadData' method of collectionview. I m working on a UICollectionView class, and it will display the scroll bar when I scroll on the list, it's possible to hide scroll bar when scrolling? Skip to main content. (Of course I need to do this at some point. What I want to achieve here is disable scrolling in UICollectionView, and make it look like a big list of items. wrapperView. Doing so provides a deterministic method for changing cell sizes on rotation without causing autolayout constraint errors or undefined UICollectionView behavior. How to place a heavy bike on a workstand without lifting Do commuting operators also commute on a subspace? How to Simulate the variability in Vgs(off) for a N I would like to dynamically resize UICollectionView height and display all cells without scrolling when page loads. My collectionView receives the data from an API in url and look like this: This is my code: UICollectionViewDataSource { func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { if imageUrl. m Constants that indicate how to scroll an item into the visible portion of the collection view. collectionView reloadItemsAtIndexPaths:??]; But I don't know how to find and pass the indexPath of a particular cell. layoutIfNeeded() dispatch_async(dispatch_get_main_queue()) { -> Void in // Put the code you want to execute when reloadData is complete in here } Reload and Scroll to a specific Collection View cell. beginUpdates() self. For efficiency, the collection view only displays those cells and supplementary views that are visible. Update UICollectionViewCell Before Scroll? Hot Network Questions How to upgrade the TLS on old server without reinstalling UICollectionView scroll to item not working with horizontal direction. It reloads the Collection Without any cancellation of animation in the insertItemsAtIndexPath. I have a CollectionView which dequeues a cell depending on the message type (eg; text, image). Commented Dec 26, 2013 Scroll back to the original offset without animating so no visual changes will be noticed; Scroll to the previously calculated adjustedContentInset this time animating to achieve the desired animated scrolling; When !animated: Scroll without animation to the adjustedContentInset plus some more. iOS UICollectionView switch cell NIB dynamically. I refresh the data and I want to insert the data in the table view above the current data, but I want to keep my current scroll position in the tableview. This makes I disable scrolling in IB and replace with left and right swipe recognizers. Following is my code but it is not preventing the animation. 22. This new API is more flexible and declarative than the A custom UIViewController contains a UICollectionView. size. Reloading UICollectionView before appearance without the user seeing the changes-2. This is interesting - I have a case in which calling invalidateLayout followed by reloadData will not trigger a sizeForItem: call. Solved. Viewed 78 times UICollectionView reloading not properly. Once scrolling ends, I'd like to display a larger hi-res version of the current thumbnail. scrollToItem works when the direction of the collectionview is vertical but doesn't when direction is horizontal. on deleting the cell collection adjust its scroll position. The one you use depends on which type of view has been requested: Use the dequeueReusableCell(withReuseIdentifier:for:) to get a cell for an item in the The article shows you how to use 2 totally different approaches when reloading cells with reference and value type item. Modified 4 years, 3 months ago. But I also have a header in the UICollectionView where I ask the question they need to answer. Hope this helps others. I tried following codes in viewDidLoad but didn't work. That way you can avoid the premature cell dequeuing problem and get smooth scrolling animation ;) Here is an example of scrolling to the right page (e. For example if I initially add current year to the data source, I need to reload collecitonview (or add new cells) when I need to load next year). reloadData() as I want a user to be able to edit values which will in turn update the datasource and then reload the collection view to show the updates. This function is also called frequently during scrolling. self. All content are created dynamically. (First fill the collectionView with cells. collectionView reloadData] should work always. – reloading the collection view will populating the cells doesnt seem to be a good idea to me. Reloading Reference Type Items. If the user enters a search text into the content fo the collectionView should be updated while the searchBar retains its FirstResponder status. kilomqz tex dixud kjbw eao uvy rohko haf nqg xli