Uicollectionview scroll delegate not working. set(1, forKey: "EnabledID") } else { if .

Uicollectionview scroll delegate not working Aug 16, 2016 · I had a similar problem and this lead me to the solution: I had a fixed size Collection View and then added other element which moved the collection view (and part of this was out of the screen), so when I was adding cells the scroll did not work because the number of elements was yet inside the space in which the scrolling should not be needed. The drawback of this is that the snapping behaviour and feel from paging is very finely tuned and you may struggle to replicate it May 29, 2018 · Hi i am making iOS application where i am using UICollectionView to show date and time and at the bottom i am showing xib view but problem is when i am using addSubview(self. I was updating the height of the UICollectionView based on the content and reloadData() stops working when you set the height of the collection view to zero. I have looked on internet but could not found anything yet. The header sticks - but not to the top of the screen - it sticks to its initial location and the collection view cells in the second section can be seen scrolling underneath it. But unfortunately, it's not working smoothly with dynamic width & height of Row & Column. c. Inside my custom cell class I have added a touchesEnded method that DOES get called, but I can not figure out why the delegate in my view controller class is not firing. Another words, if scrolling will not start, scroll view delegate methods will not be called. Oct 30, 2012 · I have a viewcontroller A controlling a large view. func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize Because this is not part of UICollectionView 's dataSource. normally you would define a datasource and provide the correct datasource and delegate methods such as 'numberOfItemsInSection' and 'cellForItemAtIndexPath'. let collectionView = UICollectionView(frame: CGRect(x: 0, y: 0, width: CGRectGetWidth(self. Oct 26, 2012 · Note the if statement checking that this is not the only item. self. Jan 24, 2017 · This code works well in Swift 3. bottomSheetVC. . From that moment, everything is fine, but until I scroll, it is not updated correctly. dataSource = self collectionView Dec 21, 2022 · Hey Everyone and thank you for taking your time to view this, I am trying to make a uiCollectionView scroll horizontally within a uiCollectionViewCell, the background and elements are showing but im unable to scroll, the uiCollectionViewcontaining the uiCollectionViewCell (which contains the uiCollectionView i need to scroll horizontally) in Apr 6, 2016 · A UIViewController maintains a reference to a UICollectionView. The view hierarchy is as follows: (Root VC) -> (Current Screen) -> (Current Page) -> (CollectionView in question) UIViewController -> UIViewController -> UIPageViewController -> UICollectionView Jul 28, 2015 · UICollectionView is a sub class of UIScrollView. I suspect there is more than one issue here since not only is the scrolling choppy, but the tabs are moving and going out of order as well. Dec 19, 2019 · I want to load more data when the user reaches the end of my CollectionView. ScrollPosition to the exact position of the item (not the . When I run my project, the UICollectionView is correctly populated, but I cannot scroll horizontally, clicking and dragging inside this UICollectionView only allows for me to scroll the tableview vertically. I literally didn't change anything else. On that view I have a subview C of type CollectionView. UICollectionView scrollToItem Not Working in iOS Feb 16, 2018 · I'm trying to create an UICollectionView which can scroll horizontally and vertically. clipsToBounds = false, however cells are getting hided. Seems like your horizontally scrolling collections of images are pretty similar, thus it would be more logically to represent each as a prototype cell of the high-level parent UICollectionView. But when I scroll the collection view, this function Collection_Scrolled is not called. delegate = self videoCollectionView. The white area is for fetch the posts from Firebase. Mar 4, 2022 · The problem that scroll of my collectionView doesn't work properly. Dec 21, 2015 · If your data is static and you want a kind of circular behavior, you can do something like this: var dataSource = ["item 0", "item 1", "item 2"] func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { return Int. swipeUpRecognizer. Jun 25, 2020 · But when I change delegate controller in ABCController to it self (to make syncScroll with mainScroll) func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize. Additionally: Sep 3, 2018 · Also uncheck paging enabled, otherwise UICollectionview with horizontal scrolling behaves sticky and does not stay in where scroll finished. centeredHorizontally, animated: true) Aug 12, 2020 · Here is my code: let layout = UICollectionViewFlowLayout() layout. You can see from the gif on the left. Then you can implement the following method which is called when the scroll animation is complete. collectionView. In my case I had to stop auto scroll behaviour in case of manual swipe, but manual scrolling would be allowed at all instances. The tabCells are just vessels for a custom button class called TabButton. targetContentOffset(forProposedContentOffset: proposedContentOffset, withScrollingVelocity: velocity Apr 18, 2014 · The UICollectionView is on B and configured with a Xib. swipeDownRecognizer. – Ozgur Sahin Commented Dec 7, 2020 at 14:53 Feb 17, 2016 · How to scroll UIcollectionView automatically in Horizontal position using NSTimer I'm working on my project source below: - (void)viewDidLoad { [super viewDidLoad]; self. So what's a problem and how fixed it? Code: var dataArray = NSMutableArray() // dataArray is has a data from Database var EnabledID = Int() EnabledID = UserDefaults. colourPicker. handleTap(_:))) self. Jan 4, 2019 · Now the problem is that for some reason, when trying to scroll back to the previous card it doesn't work correctly. One Collection view represents the tab bar at the top, the other represents pages on the bottom half of the screen. Aug 27, 2018 · Flow layout uses a line-based layout. Jan 1, 2015 · The UICollectionView's datasource and delegate methods are not being called. isUserInteractionEnabled = true @objc func handleTap(_ sender: UITapGestureRecognizer Dec 26, 2014 · It'll not work, this offset is incorrect. Apr 17, 2018 · The main steps of creating your first UICollectionView based screen are these: Drag a UICollectionView object to your view controller; Set proper constraints on the collection view; Set dataSource & delegate of the collection view; Prototype your cell layout inside the controller; Add constraints to your views inside the cell May 17, 2014 · You should implement both scrollViewDidEndDecelerating and scrollViewDidEndDragging:willDecelerate:. override func viewDidLayoutSubviews() { <#code#> } and call the scrollToItem function there, as that will disable the scroll function, because it does that the collectionView bottom always stays on top of the containerView/keyboard. Unfortunately, scrollViewDidScroll is never called. It's part of UICollectionView's delegate. As you scroll through the scrollview pages, the menu bar moves just a little bit. You should set it to the height of the view it is contained in (same as the width). m file Jan 27, 2017 · Apparently there is a new bug in UICollectionView that is causing scrollToItem to not work when paging is enabled. panGestureRecognizer. The menu bar will move to the correct menu item when I scroll left or right. delegate = self collectionView. vertical } You have to set vertical scroll from UICollectionView Properties. If the UICollectionView is 568 pixels tall then it will only ever need to scroll if it has more than 568 pixels worth of content in it. I've setup the delegate and datasource correctly, and it renders with no problem. Find more, search less Explore. Get visible cells, check if it's partially hidden, check how much, change the alpha in response for each visible cells. Below is a recording of what happens , I've attached a tapGestureRecognizer to it, when I tap the focussed (currently centered) card, it should scroll to that index - 1 (so the previous card). If it were the call would crash as there is no -1 row. I want a separate class C_Manager to handle the delegate and dataSource functionality for the C subview Feb 14, 2018 · I have this really strange issue and I can't seem to get my head around it. So if you have set the delegate and implemented UIScrollViewDelegate, you should be able to detect this the same way as UIScrollView. I need somehow to recognize if collection view will scroll to position or if item on needed position and will no scroll. A particular cell i added another UICollectionView for horizontal direction. Aug 11, 2020 · Hi again, I'm working with the GridItems now and I got the lazy cells in place. 2020 Sep 11, 2014 · UIScrollView (Vertical Scrolling Only) UIImageView ; UICollectionView #1 (Horizontal Scrolling Only) UIImageView (different from previous UIImageView) UICollectionView #2 (Vertical Scrolling Only) Important Note. Feb 3, 2013 · I have also confirmed that myCollectionView's delegate and datasource are properly set in IB to the subclassed UICollectionViewController. Aug 20, 2015 · Those already displayed 5 cells are nicely refreshed with new data, but that's it. scrollDirection = . reloadData() was working as expected. delegate = newValue } } } This way anything that calls the scroll view delegate normally still works, and you can call your particular delegate methods on self. dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath as IndexPath) as! Jan 10, 2019 · It is showing one cell at a time. (Typical promoted offer behaviour). The indexPaths are not mutually exclusive, rather they look like two distict sets with nonuniue indexPaths. I tried collectionView:willDisplayCell:forItemAtIndexPath: method but i found that sometimes when I scroll and stop midway the cell and come back, it is not updating to the previous value. 1 and Xcode 8. Here is the code that I have written but the scroll is not easily moving and the result is also not accurate for some times can any one suggest. What this means for you is that if you set the scroll direction to horizontal, then the cells will be laid out in a line form top to bottom until no more space is available and then move on to the next line. fillSuperview() This is how the datasource and delegate methods are implemented Aug 19, 2016 · I've created my UICollectionView programmatically and in this case my didSelectItemAtIndexPath method does not call at all. However, it won't respond to any user interaction, didSelectItemAt function is not getting called and I am unable to scroll it. UICollectionView is subclassed from a UIScrollView, which means I can keep resetting the scroll view content size. I have a doubt are there any delegate methods that will call when we scroll the collection view to top and bottom i. Now we can’t able to select the UICollectionViewCell and can’t able to scroll UICollectionView. Than i fixed it with scrolling to [0,0] and waiting until collectionView finishes its animation then selected item with calling delegate method didSelectItemAt manually. Anyone can detect the delegate methods of scroll view by keeping in mind some points. Below is screenshot of fixed height & width output of CollectionView: Oct 5, 2020 · So, I had a code for auto scrolling of UICollectionView(horizontal with paging enabled). UIcollection view does not scroll? 0. I can't see 3 rows, I just see 2 rows. Aug 5, 2013 · I am new to the iPhone and I am Working on the collection view at present. Apr 7, 2014 · I need some help. The basic workflow is this: Aug 25, 2016 · Hello I have working uicollectionview custom layout and i have issuesfor bottom padding and scrolling sizes. Oct 1, 2013 · You can definitely embed a UICollectionView inside a cell. let tap = UITapGestureRecognizer(target: self, action: #selector(self. I know the solution for this is collectionview. (The x and y co Jan 21, 2015 · Scroll views only scroll, if their content size is bigger then the currently visible frame. Swift UICollectionView horizontal scroll not working. Jun 29, 2017 · yes the scrolling isnt the issue, it works fine, its the fact it doesnt call the cells delegate method correctly after – jcad Commented Jun 29, 2017 at 10:46 In order to scroll up and down i need to call two methods for that I have used the below method . The main view controller has a collection view. It was working. When configuring the collection view object, assign your delegate object to its delegate property. And I guess this changes affects contentSize somehow, but don't know how to handle this changes. but even on slowest scroll, its never been called Sep 22, 2020 · I have two UICollectionView that I scroll with a press of a button pictureCollectionView. I've Aug 21, 2020 · is not called inside my UICollectionView class. minimumLineSpacing = 15 layout. so when we do that like this: lazy var snapCollectionView: UICollectionView = { let layout = UICollectionViewFlowLayout() let collectionView = UICollectionView(frame: CGRect. Apr 9, 2019 · Above the scrollview is a UICollectionView that acts as a menu bar. Note: This technique is reportedly not working from iOS 12. insertSubview(videoCollectionView, belowSubview: additionalItemsView) videoCollectionView. 0. After Zoom in, it was not possible to move the UICollectionViewcell to view the hidden area. I have. The work around is to disable paging before calling scrollToItem , then re-enabling it afterwards: Aug 5, 2014 · Turn off pagingEnabled and use the scroll view delegate method - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inout CGPoint *)targetContentOffset. isPagingEnabled = false collectionMenu. ? Setting the height of the UICollectionView to size of UIView will make your scrolling problem disabled. Have someone else faced this problem too? This collection view is inside the header reusable view. I think. horizontal self. minimumInteritemSpacing = . Now, I updated Xcode and iOS, suddenly, the same code isn't working anymore. The UIButtons instead intercept touches, and make it difficult to drag the UICollectionView. Collaborate outside of code Code Search. UICollectionView scroll to item not working with horizontal direction. 687110+0100 MyApp[8679:1601772] The behavior of the UICollectionViewFlowLayout is not defined because: 2020-10-09 21:30:08. scrollToItem(at: IndexPath(item: currentItem, section: 0), at: . Plan and track work Code Review. Setting their delegates to different classes keeps everything working correctly as seen in the gif on the left. Jun 12, 2016 · I would suggest using the UICollectionView instead of UIScrollView in your case. May 4, 2020 · In my swift app I've a collection view with a lot of items, I want to scroll to an item and then set a propriety of the collectionview cell custom class, but the cast fails, why? Here's my code, I've Apr 8, 2021 · Also, the scroll delegate will let you know the "percent" of visibility, the content offset/part of the cell visible, to know the alpha to apply to the cell. 2. dataSource = self // gesture recognizer to determine when the user has tapped anywhere but the text field, which cancells the keyboard let The issue I am having is that when I zoom a UIImageView (let's call this UIImageView Bob) and then scroll the UICollectionView in a way that Bob is not visible on the screen, and then scroll back the UICollectionView so Bob is visible, sometimes the zoom is applied to another UICollectionCellView of the UICollectionView and Bob is not zoomed Mar 2, 2017 · Indeed, the method scrollViewDidScroll(_:) is the best method for handling such an experience. createColor() override func viewDidLoad() { super. scrollIndicatorInsets = UIEdgeInsetsMake(64,0,0,0) The controller I create with xib file. 5. This is my func loadConversation() which loads the messages array I scroll my collection view to the top and would like to perform an action once the scrolling is finished. The one I want to achieve was for every content of the parent UICollectionView (vertical scrolling) would have several children (Which can be scrolled horizontal) depending on the parent row. May 27, 2016 · @cybergeeeek : Can you please post modified your code I have a working code with me and its working absolutely fine – Sandeep Bhandari Commented May 27, 2016 at 8:31 Aug 10, 2021 · One last thing: I recommend you not to use. UICollectionView inside UIScrollView not scrolling 2. collectionView!. – Jul 23, 2018 · Now i am creating a sample app by not using storyboard which i implemented UICollectionView for the main class which scroll direction is vertical. just lift up my finger). Was wondering if there're any current workaround for this? It seems evident that when adding UIScrollViewDelegate methods to the "Orthogonal Section Behaviours" example code, the delegates only get fired when scrolling vertically. i have been trying to use UICollectionVieScrollPosition. The reason for this was that candidateAttributes. After setting a minimum height. It was working fine to move the UICollectionView. Problem: The UICollectionView does not scroll upon swipe/drag. override func viewDidLayoutSubviews() { super. The same happens with taps. Problem is, when I am scrolling scroll view it's working fine but this method also working while scrolling UICollectionView. In 70 % works vertical scroll of tableView, when I try to scroll my collectionview horizontally . Oct 24, 2016 · I have implemented Row & Column based CollectionView and enabled it with customlayout of UICollectionView and it's working fine as expected with fixed width & height of Row & Column. I referred these links too, but they wont help my issue 1. I am using scrollview delegate method for UICollection as it is the subview for UIScrollView. center. When I page through the collectionView it doesn't page by cell. Sep 29, 2016 · I have implemented UICollectionViewDelegateFlowLayout in my ViewController, and specify insets using the following code: func collectionView(_ collectionView Jun 20, 2017 · I have done this code to get current page while scrolling view and there is a UICollectionView on the bottom of the screen. and not sure what changes I can make to prefect the data pre/fetching etc. I have a collection view with a custom layout and when I scroll from up to down, the collection view bounces but when I go to the bottom of the collection view it is simply stuck. CenterVertically but this does not seem to work. e. Nov 13, 2017 · I do set the delegate and enable the prefetching. top) Jul 27, 2022 · A tip for getting help here on Stack Overflow -- post code that reproduces the issue, but does NOT need supporting code. (The collectionView size is 320x80). Apr 2, 2015 · However the delegate method never gets called. When you scroll the collection view up, the header sticks to the top. greatestFiniteMagnitude layout. Under my UICollectionViewController class I have specified protocols <UICollectionViewDelegate, UICollectionViewDataSource>. 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 have a infinity loop if Dec 5, 2016 · If you cannot get it work, do feel free to ask me and I'll help you. I am stuck in this issue. velocity(in: collectionView). Ok, that works better! Two problems though: 1) My scroll to bottom method does not work in viewWillAppear: anymore - only in viewDidAppear: making the initial scrolling to Bottom (scrollToLastMessageAnimated:) visible to the user, which is unwanted. I suspect that the collectionview is for somereason offset inside its content view, causing the cells to be offscreen, inturn the delegates aren't called. For my CollectionView, I use a custom layout and I think the problem Mar 11, 2016 · Infinite scrolling in collection view can be achieved with a very easy technique. – Aug 11, 2014 · If your base view is UICollectionView, you have to set DBDraggingCell's delegate in the loading cells method - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath. try add GestureRecognizer to your UICollectionView. Dec 10, 2013 · So I used the collection flow delegate method to defined an inset (collectionView:layout:insetForSectionAtIndex:). collectionView else { let latestOffset = super. ViewController: Dec 23, 2015 · I have a UICollectionView and want to be able to perform custom behaviour when the user scrolls through implementing the scrollView delegate methods. The other cells are not displayed until I touch the screen and scroll down about the height of the cell. Feb 18, 2015 · There is a UICollectionView containing UICollectionViewCells (naturally). Is this an expected behaviour and UIScrollViewDelegate is not supported horizontally by CompositionalLayout or is it something that will be addressed? Oct 9, 2024 · Here are some solutions to help you resolve the UICollectionViewDelegate method not being called issue in iOS 18: Update UICollectionViewDelegateFlowLayout: If you are using UICollectionViewDelegateFlowLayout, update it to the latest version. h file and . Also top side first cell always stays on top when scrolling ( Left side cell must be always stay right now no problem there , but top side cell must be scroll when scrolling ) Oct 9, 2020 · 2020-10-09 21:30:08. Jun 9, 2017 · I have two collection views within a ViewController. You can see the schema of view in this Feb 9, 2022 · my CollectionView's items do not scroll, when I scroll down the first items stay at their place, without any change, you can see what I mean on the image: collectionview Here is the code of the collectionView: Jul 20, 2016 · It wouldnt work for people who want the scroll to work as its default and do more according to swipe. However it would NOT call. Jul 11, 2021 · CODE 1 scroll is correct, cells is not reload gif-demonstration //1 func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { collectionMenu. 1) Return a huge number in numberOfItemsInSection delegate method of collection view. The white area is a UICollectionView (can be scroll vertically) which nested in 1 the 4 UICollectionViewCells. h file. delegate = customDelegate } } One tricky bit is that you want to capture its original delegate. override func targetContentOffset(forProposedContentOffset proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint { guard let collectionView = self. myDelegate, like this: if let height = self. none hijacks the UICollectionView accompanying UIScrollView delegate methods. 2) The translucent effect of the UICollectionView behind the UIToolBar and the keyboard is gone Jun 5, 2019 · This UICollectionView is called topTabView and it uses tabCells. The problem is very simple: custom layout changes item's center coordinates, not width. For better results I am adding a new method after explaining this one. ,scroll up and scroll down. horizontal collectionView. Help needed! Thanks I've set the height to be 3,000 to see if the collection view would scroll but it doesn't. Use the delegate methods UICollectionView not working properly. Jun 9, 2016 · // source of colours to use in the colour collectionView private var data = collectionViewColors. However using the code below the scrollview will only scroll to the desired rect if i stop dragging with no inertia (ie. I have UIcollectionView, I am using scrollToItemAtIndexPath:atScrollPosition:animated: Method. Dec 28, 2019 · You can then check if the subview is subclass of UIScrollView and replace the delegate. view. Either left or right gets hided something like below. All my views are defined using programmatic Auto Layout. calling insertItemsAtIndexPaths id definitv not the correct way to populate a collection view cells. delegate=self NS_CLASS_AVAILABLE_IOS(6_0) @interface UICollectionView : UIScrollView UICollectionView is a subclass of UIScrollView. Here's my implementation in Swift 5 for vertical cell-based paging:. Sep 14, 2019 · To track horizontal scrolling for instance, you will need to either compare the scroll view's previous content offset to the current or check the scrolling velocity via scrollView. private func addFriendCollectionView() { let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout() layout. Then instantly 3 cells are displayed and fills the screen. @interface DemoViewController : UIViewController<UIScrollViewDelegate> { } In . Set the class as delegate of scroll view You can do this in . itemS Aug 30, 2015 · if you did not use storyboard and all is done with programmatically. endPoint = CGPoi Add UICollectionView manually; Add constrains manually, save bottom one as a property of the UIViewController's subclass; set UICollectionView's delegate and dataSource properties to self; Extend your UIViewController with protocol conformance (it was set by default for CollectionViewController) Repeat steps from I am trying to make below effect using UICollectionView and its working fine. Would this work properly? I added UICollectionView in view, and it not scroll. left etc) and at the same time enable Apr 26, 2018 · I'm setting up a UICollectionView inside a ViewController. 4 cells are for loading different type of posts from Firebase. I am setting it to that since the collection view doesn't seem to scroll up or down when I insert new items. Nov 15, 2022 · I have an UICollectionView built programatically that doesn't allow me to scroll to the last item in it. 687428+0100 MyApp[8679:1601772] the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values. But if you set contentInset, then the scroll starts working later on the value that I wrote in contentInset. That's how I'd do it: listen to did scroll. addGestureRecognizer(tap) self. Oct 10, 2013 · I am trying to use the scrollViewWillEndDragging: method to to roll my own paged UICollectionView with previews on either side similar to the App Store app. userInteractionEnabled = true Mar 4, 2018 · I have a UICollectionview which I populate with custom cells horizontally. view) UICollectionView scroll view is not working. m file; In . However, the ScrollViews are smooth scrolling only and not paging. Nov 11, 2019 · Unfortunately it seems setting orthogonalScrollingBehavior on a section to anything but . All features Apr 17, 2018 · The main steps of creating your first UICollectionView based screen are these: Drag a UICollectionView object to your view controller; Set proper constraints on the collection view; Set dataSource & delegate of the collection view; Prototype your cell layout inside the controller; Add constraints to your views inside the cell A collection view delegate manages user interactions with the collection view’s contents, including item selection, highlighting, and performing actions on those items. Here are my codes: Here is the Model: import UIKit class AppCategory: NSObject { var name: String? Aug 20, 2015 · The above animation works perfectly until I start scrolling the UICollectionView. The delegate responds to and affects operations like scrolling, zooming, deceleration of scrolled content, and scrolling animations. In my project, I have a UITableView with different types of cells. I checked the position of the displayView before and after the animateWithDuration block and it displays the exact same location. You can do this by either updating your project's dependencies or manually updating the code. I basically want to update my pageControl when user swipes on each cell. Thanks for help Dec 29, 2016 · i used a custom layout for my collection view and suddenly the didselect item stopped firing the event. The cells aren't in the center of the screen. zero, collectionViewLayout: layout) layout. 2. Jul 31, 2017 · You should not be polling isTracking and isDragging to learn when a scroll is over. sectionInset = Jan 14, 2014 · I have a UICollectionView which I have setup, everything works fine (selection, headers, etc), however, I want to change the scroll direction in some situations. However, when I increase the number of cells in the view to the point that scrolling is necessary to see the last row, I find that the UICollectionView is not able to scroll to the bottom. First, in the Storyboard you have to set up your CollectionView with: Layout: Flow Scroll Direction: Horizontal Scrolling enabled Paging enabled @IBOutlet weak var collectionView: UICollectionView! //img: 77 @IBOutlet weak var pageControl: UIPageControl! MyScrollViewDelegate } set { self. viewDidLoad() self. playerView. Apr 8, 2015 · this works perfectly as need, just couldnt understand the conditions so changed them to my own, but there is a problem, this method is called after the delegates of UICollectionView - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath but my page number variable changes in Apr 13, 2013 · I would recommend doing it in collectionView: willDisplay: Then you can be sure that the collection view delegate delivers something. This made the scroll between the first cell and second to be stuck and not scroll correctly to the first cell. UICollectionView's delegate & dataSource are linked to the view controller and I'm using the standard layout in Horizontal scroll direction. class MessagesViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate { @IBOutlet weak var collectionView: UICollectionView! My UICollectionView stop handling tap after scroll DidSelect isn't called anymore after the scroll override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: Inde May 11, 2017 · The scroll, 1st CollectionView, WebViews are working fine, when i use to add the 2nd collectionView the WebView is not working and also, the 2nd collectionView is not scrolling and also its delegate methods are not being called. if let layout = collectionView. x - halfWidth was having a negative value. frame), height: 360), collectionViewLayout: layout) collectionView. isPagingEnabled = true } Setting orthogonalScrollingBehavior to a section, embeds an internal _UICollectionViewOrthogonalScrollerEmbeddedScrollView which handles the scrolling in a section Jun 18, 2017 · I am using Swift to build an iOS application for the Hospital I work at. subviews. UICollectionView has the properties BounceHorizontally and BounceVertically. One of these cells contains a horizontally scrolling UICollectionView. so for the image below the lower cell is item 1. Nov 26, 2018 · b. Is it possible to have two separate objects that act as the collectionView delegate and scrollView delegate when working with a collectionView? May 17, 2019 · or if you are working with an existent collection view. I know on fast scroll, the prefetching is skipped. Nov 5, 2014 · Now, What I want is that: When I scroll one collectionview in any direction then all other collectionviews of my table should scroll accordingly in that direction. Here is how I set it up private let collectionView: UICollectionView = UICollectionView( Sep 19, 2022 · The UICollectionView can not scroll. We should be able to copy/paste your code and run it. The methods of this protocol are all optional. 7. stops working because I delegated collectionview to another controller. I was doing same thing in UIScrollView and it worked good and UICollectionView is subclass of UIScrollView so I think it should work. Nov 16, 2020 · The behavior of the UICollectionViewFlowLayout is not defined because: the item height must be less than the height of the UICollectionView minus the section insets top and bottom values, minus the content insets top and bottom values. Is there any way to achieve this easily? Scrolling to the top could be done by using. collectionViewLayout = layout self. viewDidLayoutSubviews() let layout = UICollectionViewFlowLayout() layout. contentInset = UIEdgeInsets(top: -10, left: 0, bottom:0, right: 0) if let layout = self. But I'd like to do scrollViewDidScroll things but non of the UIScrollView delegate methods are being called. set(1, forKey: "EnabledID") } else { if Jun 1, 2016 · I'm attempting to use a separate class for my UICollectionView DataSource and Delegate, but the methods are not being called. please help! The Gif shows scroll up when the view loads, it shows the cells/view being choppy as I attempt to scroll up. However when I scroll left and right sometimes left or right cell is hiding. Sep 17, 2017 · I have a tabbed bar view controller. count } func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath Dec 31, 2016 · I had limited the height of the top view which has the collection view as a sub-view to 64 (to force a single row). The methods that the UIScroll View Delegate protocol declares allow the adopting delegate to respond to messages from the UIScroll View class. I simply set isDeleting to no in the deleteObjectInCollection method and it all seems to work. However, in iOS 10, this does not work. This will also fix your scrolling issues in a natural way =) Jan 1, 2017 · the problem being that if the cell i want to scroll to is visible in the collection view it doesn't scroll it to the centre. func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { let cell = collectionView. Under below picture you can see;. right, . Thanks in advance. The last row is visible on the bounce, but is cut off when the bounce ends. The delegate of default gesture recognisers of the UICollcetionView is collection view UICollectionView scroll to item not working with horizontal direction. Manage code changes Discussions. Even the scroll indicator remains the same size. Jul 31, 2017 · None of above answer worked with me because cell in IndexPath(item: 0, section: 0) in my collectionView isn't visible so my app crashed. Can you post your -collectionView:numberOfRowsInSection: method so we can see how you're handling it? A collection view delegate manages user interactions with the collection view’s contents, including item selection, highlighting, and performing actions on those items. Here is the full class. And recognizing if currently visible indexPath cells were selected previously or not by using my saved values array. Jun 20, 2018 · Why scrollToItem isn't working in my CollectionView? I want to work scrollToItem on EnabledID. collectionViewLayout as? UICollectionViewFlowLayout { layout. The controller should modify the built-in flow layout using the UICollectionViewDelegateFlowLayout. You'd need to either call this yourself at the end of your automatic scrolling code or have similar logic in your automatic scrolling code to check this yourself. forEach { (subview) in if let v = subview as? UIScrollView { customDelegate. Here is my code: problem is that you dont show up any code what you did. Each UICollectionViewCell contains a UIButton with a target action associated with it. The header is attached as I wanted, Apr 16, 2016 · I'm trying to use the headerReferenceSize in my custom UICollectionViewFlowLayout. Jan 13, 2021 · The UICollectionView can not scroll. collectionViewLayout as? Aug 10, 2018 · I am not too familiar with running tasks on background threads etc. myHeight() { // I have a UICollectionview set inside a UIView in this way: videoCollectionView. I have tried using scrollview delegates but it is not working properly. Yes, they do indeed have indexPaths. This will probably not paste well here, but: !!! Cell index path 0 0 !!! Supp index path 0 0 !!! Cell index path 0 Apr 16, 2015 · I have a horizontal scrolling collectionView with each cell the size of the view. standard. setContentOffset(CGPoint(x: 0, y: 0)) scrollRectToVisible; scrollToItem(at: IndexPath, at: . max // instead of returnin dataSource. dataSource = self self. The cell size is configured in the xib : 288x80. Jul 8, 2018 · You can do this without taking any protocol. You can take weak var of current UICollectionview, And in handleTapCollapse function you can disable scrolling. Added UIPanGestureRecognizer to move the center of UICollectionView d. But scrollViewDidScroll isnt being called, my scroll view goes horizontal if that makes a difference? Why is scrollViewDidScroll not being called if collection views use the scrollview inside them? I had the same issue. If I scroll the UICollectionView and then click the button for the above animation to occur, it does not work. 3. integer(forKey: "EnabledID") if EnabledID == 0 { EnabledID = 1 UserDefaults. In short if I go into the story bo Jul 6, 2016 · I have set my collection views delegate and datasource to self. I have set the collectionView:layout:referenceSizeForHeaderInSection: method in the Apr 4, 2018 · So after hours of thinking I came across one solution. The problem is that cell which horizontal scroll direction is not pushing to another view controller which i click on it. contentInset = UIEdgeInsetsMake(64,0,0,0) collectionView. The method where the cells are to be loaded: - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath is not being called. originalDelegate = v. Jul 21, 2021 · 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. But when i set a breakpoint or console log at prefetch, it does not pass through the function ever. scrollToItem(at: indexPath, at: . A complete solution involves checking that willDecelerate is NO and invoking the same logic you have in scrollViewDidEndDecelerating - this delegate method is called if you stopped scrolling without deceleration Nov 18, 2014 · Hi First of all I need more detail about your question but I am assuming that you want your UICollectionView scrollable and actually its not scrolling. horizontal layout. Oct 12, 2017 · Everything works great in iOS 11. collectionView. and it does not scroll to it but it will scroll past item 1 to item 2. e. delegate=self self. I have set the DataSource and Delegate properly inside the viewDidLoad(). dataSource = self collectionView. You can still implement pull-to-refresh without using UIRefreshControl, you just have to observe user's scroll event. Feb 23, 2015 · This delegate method would not be called if you scrolled the view yourself, however - it would only apply if the view was scrolled by the user. What seems to be happening here is that the delegate method scrollViewDidScroll gets called for the first CollectionView and when the contentOffset is applied to the other CollectionView, the delegate method gets called again and scroll is applied to the original collectionView. Somehow, in a specific feature I have to put a UICollectionView inside the UICollectionViewCell. Hence why i Sep 23, 2013 · I changed the scroll direction to vertical, all delegates are called, I changed the frame size of the collectionview to be larger and the delegate methods are called. centeredHorizontally, animated: true) collectionMenu. When I increase the height of the top view to 128 the cells show up in the second row. I did a print out for both delegate methods that prep the cell and supplementary cell. I want to animate a list of cells that are contained in an array like so: // Called in viewDidAppear func Mar 16, 2018 · If you do not add anything else everything will be fine. It sounds like both of your UICollectionViews are using the same view controller as its datasource/delegate. So as my cellForItem was not rendering selected scroll properly after long scroll, what I tried is recognizing UIScrollView's delegate scrollViewDidEndDecelerating. When I try to scroll my collectionView horizontally, there is the vertical scroll of tableView is triggering. delegate! v. myDelegate?. delegate = self colourPicker. Any idea how to enable "Paging" on them? The UICollectionView used to have a nice little delegate :(– Jan 9, 2019 · I'm setting a collection view, which contains many cells, and already scrolls horizontally, to scroll automatically through each cell, what i have discovered till now, that its done by using a time Sep 16, 2020 · How is it possible to scroll to item and set the horizontal collectionView UICollectionView. rkvqclv azbquqdh mllcu qzfhw pgktw puicu azqyr pnfb hqpz meuyjwi