With Swift 5 and iOS 12.3, you can use one the 4 following implementations in order to set the number of items per row in your UICollectionView while managing insets and size changes (including rotation). #1. Subclassing UICollectionViewFlowLayout and using UICollectionViewFlowLayout‘s itemSize property ColumnFlowLayout.swift: import UIKit class ColumnFlowLayout: UICollectionViewFlowLayout { let cellsPerRow: Int init(cellsPerRow: Int, … Read more
It sounds like what you are asking for is a way to use UICollectionView to produce a layout like UITableView. If that’s really what you want, the right way to do this is with a custom UICollectionViewLayout subclass (maybe something like SBTableLayout). On the other hand, if you’re really asking if there is a clean … Read more
New, Edited Answer: Add this in viewDidLayoutSubviews SWIFT override func viewDidLayoutSubviews() { super.viewDidLayoutSubviews() let indexPath = IndexPath(item: 12, section: 0) self.collectionView.scrollToItem(at: indexPath, at: [.centeredVertically, .centeredHorizontally], animated: true) } Normally, .centerVertically is the case ObjC -(void)viewDidLayoutSubviews { [super viewDidLayoutSubviews]; NSIndexPath *indexPath = [NSIndexPath indexPathForItem:12 inSection:0]; [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionCenteredVertically | UICollectionViewScrollPositionCenteredHorizontally animated:NO]; } Old answer working for … Read more
Objective-C In your myCollectionViewController.h file add the UIGestureRecognizerDelegate protocol @interface myCollectionViewController : UICollectionViewController<UIGestureRecognizerDelegate> in your myCollectionViewController.m file: – (void)viewDidLoad { // attach long press gesture to collectionView UILongPressGestureRecognizer *lpgr = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)]; lpgr.delegate = self; lpgr.delaysTouchesBegan = YES; [self.collectionView addGestureRecognizer:lpgr]; } -(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer { if (gestureRecognizer.state != UIGestureRecognizerStateEnded) { return; } CGPoint p … Read more
In sizeForItemAtIndexPath return the size of the text – (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{ return [(NSString*)[arrayOfStats objectAtIndex:indexPath.row] sizeWithAttributes:NULL]; }
Just self.collectionView.delegate = self;. Note that UICollectionViewDelegateFlowLayout inherits from UICollectionViewDelegate. I admit it caught me off guard at first. Oh and this will only work if self.collectionView.collectionViewLayout is actually set to your flow layout. (or set with initWithFrame:collectionViewLayout:)
I would suggest the following: Add a height constraint to your collection view. Set its priority to 999. Set its constant to any value that makes it reasonably visible on the storyboard. Change the bottom equal constraint of the collection view to greater or equal. Connect the height constraint to an outlet. Every time you … Read more
The other solutions in this thread do not work properly, when the line is composed by only 1 item or are over complicated. Based on the example given by Ryan, I changed the code to detect a new line by inspecting the Y position of the new element. Very simple and quick in performance. Swift: … Read more
For those who stumble here later…. the reason: – (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath was not being called was because of the itemSize for the collectionViewFlowLayout’s height was too big. [self.myCollectionViewFlowLayout setItemSize:CGSizeMake(320, 548)]; If I change the height to 410, it will execute cellForItemAtIndexPath.
OK, so I found the solution here: targetContentOffsetForProposedContentOffset:withScrollingVelocity without subclassing UICollectionViewFlowLayout I should have searched for targetContentOffsetForProposedContentOffset in the begining.