Uicollectionview not reloading swift. My " UICollectionView not reloading data.
- Uicollectionview not reloading swift automatic) If you want to do it depending of your visible sections you will need to get the visible cells like this: table. When I removeAll() and then fetchPosts() it just creates duplicates and doesn't remove the posts that i thought was removed (temporarily). Modified 6 years, 11 months ago. answered Jun 8, 2017 at 4:52. class ViewController: UIViewController, UICollectionViewDataSource { @IBOutlet weak var aCollectionView: UICollectionView! I'm face a strange problem, when I execute from an action (button) the reloadData of my UICollectionView the cells are not displayed correctly, only the background image of the cells are ok. 20 reloading visible uicollectionviewcell when nested in uitableviewcell. UICollectionView Update Cell content for specific cell. It is calling this piece of code (I am running a println) but still not reloading the data? – Haring10. UIcollectionviews data won't change after i call the reloadData() function and change my default sources for the label and imageView, unless i scroll each cell out of the screen and scroll back to see the data have changed. Collection view doesn't reload (Swift) 0. Call collectionView. And when i try Since this is Firebase . Finally I found the solution, while reloading array I update UIColectionViewFlowLayout also, check the below code; I have some data that is fetched in another thread that updates a UICollectionView's header. So Look at the documentation for UICollectionView. It seems that wrapping collection view and u If your UICollectionView have not proper content size, then cellForItemAt will not called. I'd like to implement it in swift. Ok so I've added a UICollectionView inside a UIView and added an item, but I can't seem to figure out why the item is not showing in the collection view. Thanks, this worked! Swift 4. 3. Where I am having trouble is reloading the UICollectionView using the new filteredCategories array. If you want to select I think you do not understand how the UITableView and UICollectionView delegate methods work. The issue I'm having is I'm basically refreshing my data at 5Hz, but by refreshing the CollectionView with reload method EDIT (Solution): ok so the problem was that i wasn't reloading the data after i fetched images from firebase. You can reload your cells using any of I know how to display Collection cell in an UICollectionView. Viewed 10k times Part of Mobile Development Collective 3 . Improve this question. 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. collectionView. Every users can load an image and this image is seen in the controller with UICollectionView. If you want every cell to be reloaded: collectionView. I want to add a new section after the user creates data and display data in the new section. Swift - display UICollectionView after retrieving data. UICollectionView not updating. collectionView. 4. @AndreaAbbate The first section (section == 0) is a section I am using for a custom header, so I don't need any sections returned for it. in my codes, titles variable is an array of my url images. Fail to redraw UICollectionViewCell after reloadData() 1. This question is in a collective: a subcommunity defined Section header persists even after removing section data and reloading UICollectionView. visibleCells When I created the section header I put collectionView there and I want it to attach to the navigation bar when scrolling, I did this through pinToVisibleBounds. I have a UICollectionView subclass called imageCell. Swift tableView. Simply change your reload statement: DispatchQueue. xib is nil Swift. When I click on this button, it will show alert message to ask. reloadData() because it reduced cell swapping when records were inserted. myCollectionView addObserver:self forKeyPath:@"contentSize" options:NSKeyValueObservingOptionOld context:NULL]; I have UICollectionView in a cell of UITableView. I’d suggest that you use Instrument to benchmark and find cpu spikes when you reload the page. once the photo is loaded, in the UICollectionView it does not appear because the data must be refreshed. i am trying to implement a pull to refresh on a UiCollectionView using swift view. Ask Question Asked 7 years, 10 months ago. Mobile Development Collective Join the discussion. The cellForItemAt method is what updates your cells. its call the the another API call but same response come with minor modification(e. UICollectionView reloadData() does not update cells in the collection view. I'm moving a cell from indexPath 0 to say 100. collectionView reloadData] and UICollectionViewDataSource protocol methods will be called. Its work fine when picking the images, but the images is not appears on the UICollectionView. The article shows you how to use 2 totally different approaches when reloading cells with Hello Devs, I'm currently trying to implement a UICollectionView. I try to select the images once again, and the previous images are viewed. 1,184 1 How do i correctly reload my UICollectionView's data? 2. I have a problem while reloading collectionview. assetCollection, options: nil) followed by self. In the viewcontroller viewDidLoad method, I I was using auto complete and I landed up using registerClass:forCellWithReuseId: and that caused my views to not load and hence not show up. There're several approaches to handle this. Using itemAtIndexIndexPath to determine the last cell is not the best way, you should check when the scrollView is going to scroll to bottom. self, forSupplementaryViewOfKind: UICollectionView. dataCollection. The current selected is not. So the number and size of the cells change. swift - A UICollectionViewController and (2) PhotoThumbnail. When I use reloadData method, header and footer section also reloads, so that's what I want. How to reload section from collectionview. Reload collectionview cells and not the section header. Fail to redraw UICollectionViewCell after reloadData() 0. You can add breakpoint in awakeFromNib and tap more button to check it. I found this to work better for me than collectionView. reloading visible uicollectionviewcell when nested in uitableviewcell. After clicks on OK button, the item in Collection View will delete. 1. 8. I have tried, when i do the pull, i can see the subview showing the progress gif image. In a willDisplayCell method you can check if indexPath of a cell is getting close to the last index in I use CoreData and want to reload the UICollectionView when I save a new entry in CoreData but the only self. I just created a collection view using vertical scrolling and it works when adding new cell(s) dynamically, but when I changed the scrolling to horizontal it does not work. 0 Licensed Software to only one person? I have a UITabBar with some ViewController. Hot Network Questions There's definitely a compromise between accessing and manually updating the cell view content, and calling reloadData on the whole collection view that you could try. 7 with swift 5. func collectionView(_ collectionView: UICollectionView, didSelectItemAt If you'd like to perform some code after your collectionView has completed it's reloadData() method, then try this (Swift): UICollectionView reloading not properly. g - number of follower property increase by one). The second section (section ==1) is where I want the section with the horizontal scroll. Tried disabling UIView animation before, and enabling after reloading section, but still gives me a little animation. Asking for help, clarification, or responding to other answers. reloadSections(<Array of Sections>). If somehow the class needs to fetch data from server and does that in good async call, it means the data is going to arrive later and after the datasources methods to load the cells are called. Improve this answer. This collection view is supposed to be a grid of images. Calling reload without dispatch_async is not refreshing collectionView – NaveenRaghuveer. reloadSections(index, with: UITableViewRowAnimation. Flickering issue with UICollectionView while reloading. reloaddata()don´t run it reload nothing. If you not reload content of cell (reload collectionview) it will display like uitableviewcell 1 at index 0. – RPM. ReloadData in UICollectionView. Every new game, i change the number of cards in the game. reloadData() its not good idea cause it reload all the collection view and it consume performance, Reload data in a UICollectionView - Swift. If you app only need to support iOS 15 and above, you can proceed to this article: Table and Collection View Cells Reload Improvements Not loaded collectionview when I add in view did load: newsTableView. I have a default UIImage array and name array for the label and the imageView in my collectionView cell. com into a UICollectionView. the cells are not displaying at all and I am getting a tone of non-stop console errors like: The behavior of the NOTE: newbie in ios development. CollectionView not reloading after retrieving data from Firestore. There are only a few items there (let's assume 10 photos is a maximum). My CoreData and UICollectionView I have try it to reload the UICollectionView when clockblogalarm become a new entry: To take the outlet of bCollection, you need to create a subclass of UICollectionReusableView. Everything works except for the reloadData() function. when a user clicks on the correct cell, I draw another imageView in that cell (a correctCircle let's call it). Hot Network Questions testing for a correlation between a real number and percentage accuracy Schrödinger's cat ++ Meaning of "I love my love with an S—" in Richard Burton's "Arabian Nights" If scent means a pleasant smell, why do we say "lovely scent Im trying to create UicollectionView and to load images in that cell . UICollectionView relodItemsAtIndexPaths reloads all items the collection view. contentOffset. collectionViewContentSize for intrinsicContentSize makes sure, to always have the correct size; Then just call it whenever it might change (like on reloadData); Code: override func reloadData() { super. You don't use reloadData() but rather insertItemsAtIndexPaths:, that way you don't have rebuild the whole table and only build the items you need. collectionview. CollectionView reloaddata() after value change. Now to reload the data after the arrival from the server or async task, call the collectionView's reloadData method like so. If you are scrolling and a cell becomes invisible, the same object is used again (dequeueReusableCell) and a new content is set in cellForItemAtAs mentioned in the previous answers, before reusing the cell, prepareForReuse() is called on the cell. It's inconvenient and unfriendly UX. Can you add self. Here is my code If there has been some data changed, cellForItemAt does not get called. my Reload data in a UICollectionView - Swift. selva balasubramanian If this is the case then your issue must be far greater then collection view not reloading. xib to be shown. Everything seem to work fine until I reladData() or do In the func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell, you should set up the values to be shown in the cells before returning them. Follow edited Jun 8, 2017 at 7:38. Each cell loaded two button. It's part of UICollectionView's delegate. sometimes they resize correctly to fit the width of the string and sometimes they seem to use the estimated width of the cell and truncate the string. present(vc, animated: true) }, don't forget to add identifier to your collectionViewController Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. uicollectionview not showing cells swift. I ended up, by subclassing the UICollectionView and overriding some methods as follows. Declare the data source array as an array of UIImage. – Wayne Filkins. Go to swift r/swift • by CollectionView inside tableView not reloading Properly . Similarly the parameter to your filter block should be product. #selector(UICollectionView. reloadData() does not reload table view in Swift. rowHeight = UITableViewAutomaticDimension but if delete this code, my collection load in cell. It is first updated after making an api call (didSet), but in a load more mechanism when i try to append data to the data source array and reload the collectionView. If you have ever worked with table view, it will be very familiar to You might use this method to insert, delete, reload, or move cells or use it to change the layout parameters associated with one or more cells. Reset UICollectionView on change cell. I have created an "MyCustomView" as xib which contains label, button and imageView as shown in below code: import UIKit @IBDesignable class How to load custom cell ( xib) in UICollectionView cell using swift. deselectItem(at: $0, Ok. elementKindSectionHeader, withReuseIdentifier: "YourHardCodeIdentifierString") Maybe when you reload data then need to calculate a new height with new data then you can get it by: add observer to listen when your CollectionView finished reload data at viewdidload: [self. collectionView?. estimatedRowHeight = 44. How come collectionView cellForItemAt is not being called? Reload data in a UICollectionView - Swift. Properties should start with a lower case letter (array) but that also isn't a very descriptive property name. I am using UICollectionView in my project, but it does not draw the cells for the reused ones. UICollectionView does not reload properly. y + UICollectionView does not reload properly. If you want to reload specific cells: collectionView. However, as explained in the question I need to have a mechanism to reset everything. The structure of the three classes is below. Think that i have 20 cells when the app open, draw method is called 20 times. This works fine. However, the UI does not refresh , the item was not deleted. I override the draw() function of the UICollectionViewCell to arrange my images when load the cells. After each click (wait 2 secs) the question should be updated, I have a function that I have tried so many ways to load image from server in collection view, but the lag is still there when scrolling! (_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) and collectionView(_ collectionView: UICollectionView, willDisplay cell: SWIFT - CollectionView -> ImageView load URL image. class MessagesViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate { @IBOutlet weak var collectionView: UICollectionView! Reload data in a UICollectionView - Swift. invalidateLayout() in dispatch after 1 second in viewWillAppear but still not getting the result as FooterView expanded. Follow edited Jul 20, 2017 at 10:49. There is nothing to be set the in property cell. fetchAssetsInAssetCollection(self. but collection view did not reload. 20. To load the images asynchronously and not inside the collection view datasource methods use DispatchGroup to load the images one by one and notify when all images are available. Modified 1 year, 11 months ago. Reload collectionView after the JSON appends; NewsCollectionVC. @IBOutlet weak var mycollectionview: I'm trying to reload only data section, not header or footer (supplementary view), of UICollectionView. title = "Centill" Reload data in a UICollectionView - Swift. reloadData(). Collection view doesn't reload (Swift) 12. Here is the code: Why UICollectionView ReloadItems always calls CellForItemAt twice for each item? And how to prevent duplicate calls? How to prevent spending double resources for reloading of selected cells? ReloadData() calls CellForItemAt only once. 11 UICollectionView does not reload properly. Add a comment | Reload data in a UICollectionView - Swift. Share. Here i attached the collectionview image: Here my code: @IBOutlet weak var dataCollectionView: UICollectionView! I am developing a card game using UICollectionView. 0 Swift reload collection view not working. I succeeded but when I scroll down in simulator, images keep on reloading and changing positions. Viewed 73 times Part of Mobile Development Collective Swift reload collection view not working. So, I do not want to reload images from backend every time cell reusing. Follow By this answer I came to know that if UICollectionViewCell is not visible then it will return nil. Prior to iOS 15, we can reload a cell with reference type item using the snapshot’s reloadItems(_:) method like so:. reloadData () in the functions where i fetch data. In the app, I can hit the back button and re-enter the UICollectionView and all of the images are there. I wasn't sure if it would keep the image from the original, or just not have one at all after reload. We’ve now modified the user interface so that it considers ViewController to be a collection view controller, but we haven’t implemented any of the data source methods to make that work. UICollectionViewCells are reused to avoid instantiations, to optimize the performance. Thanks for your Help. Everything works fine the first time. Collection View inside Table does not load immediately in swift 3. The actual thing lies in the selection mode. I printed items when next method is called, and is called in the first and second click (second not necessary in the button, no matter where in the screen) func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell What could be When i add a new string to an array in my database, reload array into my datasource and do a collectionview reloaddata, the cells resize in an unpredictable way. Reload data in a UICollectionView - Swift. Another option, if a cell is currently visible, is to use the cellForItem(at:) method to get a I think the solution @zeiteisen provided is a way around solution. Put a breakpoint in your collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell and check if you are loading correct data when you call reloadData – I'm trying to pick multiple images from the library, and view at the UICollectionView. Button flickering when reloading data in CollectionVIew. All you're doing right now is I have a collectionview to display a list of comments, but I want the cells to start displaying from bottom, a pattern seen in the WhatsApp and Telegram App for iOS (new messages starts from the bottom and populate upwards), like in the image below. I have two solution for it. Fail to redraw UICollectionViewCell after reloadData() 8. Ensure these methods are called, ensure these are on the view controller (not a view), ensure these are on correct view controller I checked if data is correct so that's not the problem. reloadSections(IndexSet(integer: 0)) What I'm trying to accomplish: For this project, I will mention only two source files: (1) RPPhotoLibrary. Last Cell in UICollectionView is clipped. I want to load the images (and videos) from the user's photo library (preferably all of them) and present them into a UICollectionViewCell for each cell in the swift; uicollectionview; Share. The UICollectionView's datasource and delegate methods are not being called. I have a UICollectionView with 142 Cells. There is no need for the async dispatch in this code since you will already be on the main queue. iOS swift: UICollectionview horizontal scroll single cell not reloading. reloadData), with: nil, waitUntilDone: true) Share. iOS will not load 100 cells at the same time because it will be very slow and not a good user experience. UICollectionViewCells not showing after reloadData() 1. But it's a waste of resources either to reload all rows and sections when only 2-3 items needed to be updated. I'm very new to Swift, and have googled for hours (and read plenty of StackOverflow articles), and cannot seem to find the correct answer to this question. I'm attempting to learn Swift & the basics of iOS dev at the same time, so bear with me. i just needed to put collectionView. Ask Question Asked 8 years, 7 months ago. UICollectionView Cells resize UICollectionView does not reload properly. Reloading the whole section works fine. 2 version: self. We don't see a reason for the content reset to occur, feels like we are missing something. I add UICollectionView in my app and each cell has "Delete" trash button. Commented Aug 30, 2016 at 5:43. allowsMultipleSelection is NO by default and allowsSelection is YES. . In your case it looks like your model is self. UICollectionViewCell draw() method is not called after reloading data. Here is my code I suppose when you reloading section for the first time, collectionView creates new Cell and self. the changes are not reflected. class NewsCollectionVC: UIViewController { var newsResult = [NewsModel]() var newsManager = NewsManager() @IBOutlet weak var collectionView: UICollectionView! I have added the functionality of load more in one of my application so let me give you the code. This works with swift 5. UICollectionView refreshing issue. This causes the collection view to With this method you can implement specific cells to be In October 2020, I published an article that discusses how to reload a table and collection view cell when using diffable data source. 0. selected. UICollectionView reloadData() does not update cells in the collection view Photo by kevin laminto on Unsplash. it shows After looking online a bit, I took a tutorial for UITableView and adapted it to my UICollectionView. Provide details and share your research! But avoid . Hot Network Questions How to create a thesis flowchart using Mathematica? Here is a Swift 3 version to performBatchUpdates without animation to a UICollectionView. viewDidLoad() navigationItem. I'm trying to append the data array when the user pressed on a cell to the data array which I set in fallQuarterCell and assigned with UsersDefaults. Show Activity Indicator while data load in collectionView Swift. reloadData() I'd suggest that you don't use reloadData() for what you're trying to achieve. uicollectionview - data automatically load without calling reloaddata. Hot Network Questions If Occam's razor supports naturalism over theism, then why was William of Ockham, its author, a theist and not a naturalist? Reload data in a UICollectionView - Swift. lettersArray0 so make sure it has been updated before you call reload. Nguyen Hoan Reload data in a UICollectionView - Swift. Commented Oct 26, 2014 at 13:27. a copy of that item is inserted to the start section 1 in the data source, and I want to reload section 1 to reflect the updated recent items. So: UICollectionView Custom layout reloading issue in Swift. If you want to change your UICollectionView layout to another, call -setCollectionViewLayout:. I am trying to implement self sizing cells for UICollectionView with FlowLayout. Use the block passed in the updates parameter to specify all of the operations you want to perform. It might not be updating because one or both collection view data source methods are not dynamic. I have. I have collection view with image and label. You have to implement the following datasource protocol methods as of swift 3. 7. swift; uicollectionview; uiimageview; Share. I'm having something like a shopping cart page, it shows the products the user selected in a collection view, with each cell having 2 button linked to the product that will increase/decrease the amount of product to a singleton cartManager. reloadData() does not reload table view in Swift Hot Network Questions Is it legal to send a modified version of a GPL 3. 3 - IOS 14 - xCode 12. – Michel. 2 Swift reload collection view with button click not works CollectionView reload data not working swift ios? Load 7 more related questions Show fewer related questions Sorted by: Reset to default I have a UICollectionView of 20 cells with an imageView inside of them. In some cases it works fine. collectionViewLayout. func collectionView(_ collectionView: UICollectionView, layout reloadData reloads all cells in your UICollectionView so if you have any reference to cells it will point to object that is not exist, and what's more if it's strong reference it may cause a retain cycle. Follow edited Apr 20, 2017 at 10:30. but it is not entering the selector method loadData() or reloading the data. I think most of your issues would disappear if you moved all of your current stuff into a single I'm working with a UICollectionView as UIViewRepresentable. But gives me an unwanted animation. I have a collection view that has sections and the beginning. swift. I am new to swift. Anyone help me. swift; uicollectionview; nsdiffabledatasourcesnapshot; or ask your own question. 0 How to reload collection view inside UICollectionReusableView in swift. Thanks a lot ! – Tom3652 I am new to Swift and I wanted to load my Instagram images using the Instagram API. Section 1: recently selected items. 5 Disable UICollectionView animation on reloadData Swift reload collection view not working. If you want to change your cell style or update the data, call [self. UICollectionView cells only display after second call to reloadData. Then i change the number of cells to 30 and reload CollectionView, then This is a UICollectionView, not a UITableView. The Xcode docs on UICollectionView are quite good. Follow asked Sep 29, 2019 at 13:19. Apple introduced a better way to reload a cell in WWDC21. How to reload collection view inside UICollectionReusableView in swift. reloadItems(<Array of IndexPaths>). Returning self. I just don't know what I'm doing wrong with the reloadData() function. If the collection view’s layout isn’t up to date before you call this method, a reload may occur. 5 are visible at any one time. yourCollectionView. I follow some tutorial to develop social application like twitter. invalidateIntrinsicContentSize() And as Luis Ramirez mentioned, you I would like to change my entier array used to created all my cells with a button and then reload my collection view, but it is not working. My Code is I am trying to implement a collection view inside each table view cell in a table view, but am having trouble getting the collection view to reload at the right time. 0 newsTableView. init(integer: 0) //The section to reload table. However, I don't understand why this is happening. Example: UIViewController containing aCollection:. swift; uicollectionview Updated: 16 June 2021. I created collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell is not called. xib doesn't even show either. Issue with cells flicker when loading UICollectionViewCell Swift 4. i am able to load images and label values very slowly in collection view i mean collection view take so much time to download json img urls. Reload UICollectionViewCell which has image. When my model I am building a layout in which i have to show airplane seats (grid layout) so i have used collectionView inside tableView, but the problem is that once data is fetched and passed My best guess is that the ProductService. Reloading TableViewCell inside CollectionViewCell. There are several "reload" methods: reloadData() reloadSections(_:) reloadItems(at:) 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. Swift: UICollectionView images loading. Today we are going to walk through a basic implementation of UICollectionView from scratch. I used LTBA components to build swift app. So, the methods cellForItemAtIndexPath or cellForRowAtIndexPath are called only when the cells appear on the screen. Load 7 more related questions Show fewer related questions Sorted by: Reset to I have some trouble understanding where I should reload the data inside my UICollectionView, so that the images picked through UIImagePicker from gallery get displayed on the Collection View. numberOfLines takes initial value 0. I'm working on a project in swift 3 and it contains a UICollectionView inside a UITableView. Second UICollectionView not reloading. Hot Network Questions I have a yearOne Class, fallQuarterCell Class as one view controller file and SearchPage Class as another view controller file. I can call collectionView reloadSections:, but this reloads the entire section which is unnecessary. I've tried to implement CollectionView in SwiftUI via UIViewRepresentable and use there SwiftUI views as reusable cells but cells doesn't appear at all. How to make uicollectionview reload once it receives data from firebase? 0. What am I missing? iOS 8 Swift UICollectionView reloadData() causing views (images) to jump cells. Swift reload collection view not working. The way you are populating your cells Swift reload collection view not working. Add collectionViewLayout in main thread before reloading collectionView which helps to adjust content size. bounds. func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int{return datalistArr. the usual scrollToItem is not working anymore in IOS 14 for me, and it was working in IOS 13. The searching works fine, as I am able to print the search results which go into the filteredCategories array. Duncan C Duncan C Reload data in a UICollectionView - Swift. swift: - A UICollectionViewCell. ReloadData with Protocol on custom cell with Collectionview? 4. I start implement to follow button functions. I can't pre-load all of them. forEach({ collectionView. func collectionView(_ collectionView: UICollectionView, shouldSelectItemAt indexPath: IndexPath) -> Bool { collectionView. reloadData() I am trying to follow the following post on reload a cell in a UICollectionView: UICollectionView update a single cell I know that I ultimately want something that looks like this: [self. Call reloadItems(at:) and pass in an array containing a single IndexPath of the cell you want to reload. Hot Network Questions I have a pretty simple UICollectionView that for some reason does not reloadData() as I would expect after a filter is applied. reloadData() in the completion handler and let me know if it has improved. andih. Therefore, I want to create 10 cells, load images into them you moveRight func works wrong, you are creating new object and trying to present it, you must instantiate vc from storyboard replace with this @objc func moveRight() { let vc = UIStoryboard(name: "Main", bundle: nil). 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. Load CollectionView cells only when all data is loaded. I have created a small sample project using Swift. register(YourClassName. Ask Question Asked 5 years, 8 months ago. The issue is you are reloading your UICollectionView on a background thread. Other times the . appUpdateLabel. instantiateViewController(withIdentifier: "collection") self. The reason i used removeAll() and fetchPosts() is 'cause since i have Firebase backend it fetches the posts but doesn't update after posting a pic. How to clear a UICollectionViewCell on reload? 2. In a ViewController i have a UICollectionView where there are images of users. Viewed 152 times swift; uicollectionview; uicollectionviewcell; Share. ios swift UICollectionVIew Issue: The behavior of the UICollectionViewFlowLayout is not defined because. scrollToItem(at: indexPath, at: . In general, you would use the UICollectionView as provided by UIKit, and then have your UIViewController subclass (for example, can be any other class) as a data source and delegate of the collection. Swift array append not working on collectionView reload data. Currently, images will be displayed when the user signs out and then signs back in. But I want to use a custom layout for displaying the cells. This UICollectionView displays user's profile photos. GetProduct is causing it. UICollectionView Cell not changing upon selecting. I've even called the reload function but still no difference: DispatchQueue. UICollectionView Refresh Issue. instead I would recommend this:. I found the method reloadSections:, but I don't know why it doesn't work. 5,593 3 3 (delete particular array element and reload collectionView) then app get crashed. I'm trying to show activity indicator for every cell until the image for UICollectionView cell show up, but it only shown in the last cell. You should read them. but i need . You can use the func reloadItems(at: [IndexPath]) to ask the UICollectionView to reload a single cell if it's on screen. Custom animation on UICollectionView reload data. ChildAdded, it runs several times on load to fill the collectionView with all the posts, then runs again every time a post is added. Hi all, I encountered a weird behavior today : I've got a collectionView, a struct file (with the proper Hashable protocol implemented). layoutIfneeded() before reloading collectionView. Load 7 more related You still need to register your class, not the nib, otherwise it won't type cast. So you can overrride I have made your suggested changes with some test height CGFloat values of 100 for now. bottom let maxVisibleY = tableView. I tried to invalidate the layout with invalidateLayout() reloading or not reloading the collectionView before to replace the collectionViewLayout and it stills crashing. But, I want to Reload data in a UICollectionView - Swift. call also perfectly working. async { self. Presumably, imageNotInCache means you're storing image in an in-memory cache, Reload data in a UICollectionView - Swift. You load additional data when use hits a specific point your collection view. Try add in method @objc private func handleMore() – self. private let reuseIdentifier = "cell_supporters" class I have got this Swift code ` let cellId="cellId" class FeedController: UICollectionViewController{ override func viewDidLoad() { super. But collectionView. I'm trying to download a set of images from Parse. How to reload a collectionview cell without reloading an image. 11. It looks like the collection view reloads itself after all the table view cells have been loaded, not each time a new cell is dequeued to the table view as I'm trying to make it do. My code: func collectionView(_ collectionView: How to show/hide cell in UICollectionView using Swift? 4. CollectionView reload data not working swift ios? 0. Commented Mar 28, UICollectionView Custom layout reloading issue in Swift. You can change the collection view frame and cells UICollectionView does not reload properly. In cellForRow after getting a cell object from dequeueReusableCell I am initializing a new UIView instance and adding it as a subview to my celll. height - tableView. Ask Question Asked 7 years, 2 months ago. Follow answered Nov 7, 2018 at 0:07. I have been using this code to reload my UICollectionView: self. var isScrolledToBottomWithBuffer: Bool { let buffer = tableView. Reloading TableView from CollectionViewCell. Anything that should immediately update the view must be run on the main thread. photosAsset = PHAsset. This is the code I'm using right now, but I can't seem to understand why it crashes giving me a SIGBRT Error, right after the picker gets dismissed When the view opens sometimes the collection view will have loaded the content and other times it does not load any content into the cell causing just the . UICollectionView cells recalculating sizes (flicker) while scrolling. It should be updated when either current item is changed (to scroll to the current item and highlight it), or the source Call this method to selectively reload only the items in the specified sections. The signature for this method has changed in Swift 3 to: func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize { // your code here } Because this is not part of UICollectionView 's dataSource. Commented Oct 25, 2016 at 1:24. Hot Network Questions Could a gas giant still be low on the horizon from the equator of a tidally locked moon? JSON does not load in CollectionView and the screen is empty; What I have tried to solve my problems. Sounds like you’re trying to do too much by embedding a collection view in a tableview. Best way to reload UICollectionView. I managed to fix it by reloading data on main thread. So I did reloading FooterView by calling self. CollectionView reload data not working swift ios? 2. this code for cell in tableview -setCollectionViewLayout: or -setCollectionViewLayout:animated: won't cause your UICollectionView reload its data. How to reload a single cell of a collectionView in the willDisplayCell callback? 3. Im getting only the cell and not the images. UICollectionView datasource method not called after reload data. I am having a problem reloading the collection view so that it will display the images immediately after a post. UICollectionView reloading not properly. I am getting the right values into the filtered array, but I am getting rogue cells in the collection view that do not clear until scrolled - dequeued. Swift Swift. 2 UICollectionView not I have a horizontal UICollectionView with several sections, each containing several cells as follows: Section 0: one cell to cancel selection. 0 UICollectionView does not reload properly. Modified 5 years, 8 months ago. I updated the post, hoping it gives you the information you need. It does append to the data array but it only shows up when I'm moving from I've got a UITableView where each prototype cell has a UICollectionView in it. What fixed the problem was calling reloadData from the main thread. How can I stop that autoscroll (by 1 screenheight)? I tried using setContentOffset to counterscroll, but the problem is that any code I add will be performed on load for every single post. contentInset. swift; Share. main. count } The only "fix" that we did that works (which is not reliable at all), is to manually setting the contentOffset again after reloading the data. Swift reload collection view with button click not works. 2. The proper way to get a cell to update is to update the model, then reload the collection view, which will call cellForItemAt and redraw your cell based on the model. I've tried to reload the collection view into the main t UICollectionView Reloading cells but not deleting old ones. How to clear a UICollectionViewCell on reload? 4. centeredHorizontally, animated: true) } However, this all this does is scrolling the left-most cell's left side to the center, no matter which cell is tapped. But I also have a header in the UICollectionView where I ask the question they need to answer. Its not the nicest effect, I would like to pre-load the cells surrounding the new position, 4 before and 4 UICollectionView has multiple ways of reloading data. 2 (one week ago). However, I've not found an efficient way of reloading a supplementary view such as a header or footer. reloadData() } swift; uicollectionview; uicollectionviewcell; Writing this question as my last resort, being stuck on this for few days now. Modified 7 years, 2 months ago. don't work reload data CollectionView. Swift CollectionView ReloadData Acting Weird. Follow edited Sep 15, Reloading Reference Type Items. Naming a property Array is quite confusing as that is the name of the Swift foundation type. I got my data from a url as json string. I don't know if that is actually causing your issues or not, but I would start by dropping that Grid class. DashBoardCollectionVC Inside of my collectionView cell i have a nested collection view. You can reload a specific section using the code below: let table = UITableView() let index = IndexSet. CollectionView reload data not working swift ios? 1. This works just like table views, so we get questions like “how many items are there?” and “what’s in item number 1?” that we need to provide sensible answers for. Commented Sep 7, 2016 at 6:41. UITableView - reloadRows method creating weired scrolling bug. collection func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) { collectionView. If you want a specific section to be reloaded: collectionView. top - tableView. There are two properties of the UICollectionView name allowsMultipleSelection and allowsSelection. 5. I am building a layout in which i have to show airplane seats (grid layout) so i have used collectionView inside tableView, but the problem is that once data is fetched and passed to the vc and the tableview reloads, some of the rows with the collectionview . In order to avoid initializing this view every time I am checking whether the view already exists and skip initializing a new one if so. My " UICollectionView not reloading data. 20 UICollectionView reloadSections with animation. reloadData() } In the view controller, if you are using storyboard, connect UICollectionviewFlowLayout (collectionViewFlowLayout in my example) using IBOutlet, collection view width constraint (collectionViewWidth in my example) as IBOutlet and UICollectionView as IBOutlet (collectionView in my example). UICollectionView reloadData not working. indexPathsForSelectedItems?. UICollectionView created in . llpzmd qpbunt uhiopb msszk mlziif saszt qbrfs vtcwfe shrs sntgk