uicollectionviewcell – Page 2

Where to highlight UICollectionViewCell: delegate or cell?

September 16, 2023 by Tarik

As the documentation says, you can rely on highlighted property to be changed while the cell is highlighted. For example the following code will make the cell red when highlighted (not its subviews though): – (void)setHighlighted:(BOOL)highlighted { [super setHighlighted:highlighted]; [self setNeedsDisplay]; } – (void)drawRect:(CGRect)rect { [super drawRect:rect]; if (self.highlighted) { CGContextRef context = UIGraphicsGetCurrentContext(); CGContextSetRGBFillColor(context, … Read more

UICollectionview Scrolling choppy when loading cells

September 4, 2023 by Tarik

So anybody having scrolling issues should do this add these 2 lines after your dequeue cell.layer.shouldRasterize = YES; cell.layer.rasterizationScale = [UIScreen mainScreen].scale;

How can I enable/disable section headers in UICollectionView programmatically?

August 1, 2023 by Tarik

You can either use the collectionView:layout:referenceSizeForHeaderInSection: method of the UICollectionViewDelegateFlowLayout and return CGSizeMake(0,0) or set accordingly the headerReferenceSize of UICollectionViewFlowLayout. Edit: headerReferenceSize is actually the property that storyboard uses to show/hide the headers. I’ve added the relevant lines from the Storyboard file With section checkbox on: <collectionViewFlowLayout key=”collectionViewLayout” minimumLineSpacing=”10″ minimumInteritemSpacing=”10″ id=”xAt-Uo-bMl”> <size key=”headerReferenceSize” width=”50″ height=”50″/></collectionViewFlowLayout> … Read more

UICollectionViewCell content wrong size on first load

May 24, 2023 by Tarik

It looks like it still retains it’s 100x100px basic size for the contentView while the cell itself gets the right size already. You can force the layout to reset adding the following line just before you return the cell: cell?.layoutIfNeeded()

Create UICollectionViewCell subclass with xib [duplicate]

May 17, 2023 by Tarik

Make sure the cell on the .xib file know what’s the type of the cell. Select the cell on your interface builder and then on the identity inspector Subsequently associate your labels with your properties. (I think you already did that) Then I’d recommend to verify if you already loaded the .xib file on your … Read more

Subview frame is incorrect when creating UICollectionViewCell

May 15, 2023 by Tarik

You can get the final frames of your cell by overriding layoutIfNeeded() in your custom Cell class like this: override func layoutIfNeeded() { super.layoutIfNeeded() self.subView.layer.cornerRadius = self.subView.bounds.width / 2 } then in your UICollectionView data Source method cellForRowAtIndexPath: do this: let cell = collectionView.dequeueReusableCellWithReuseIdentifier(“Cell”, forIndexPath: indexPath) as! CustomCollectionViewCell cell.setNeedsLayout() cell.layoutIfNeeded()

How to create UICollectionViewCell programmatically

May 14, 2023 by Tarik

Try to copy and paste this code into your xcode, it should work // // HomeVIewController.swift // Photolancer // // Created by Lee SangJoon on 9/8/16. // Copyright © 2016 Givnite. All rights reserved. // import UIKit class HomeViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout { var collectionview: UICollectionView! var cellId = “Cell” override func viewDidLoad() { super.viewDidLoad() … Read more

Resize UICollectionView cells after their data has been set

May 11, 2023 by Tarik

I think your are looking for the invalidateLayout method you can call on the .collectionViewLayout property of your UICollectionView. This method regenerates your layout, which in your case means also calling -collectionView: layout: sizeForItemAtIndexPath:, which is the right place to reflect your desired item size. Jirune points the right direction on how to calculate them. … Read more

Is force cast really bad and should always avoid it?

May 11, 2023 by Tarik

This question is probably opinion based, so take my answer with a grain of salt, but I wouldn’t say that force downcast is always bad; you just need to consider the semantics and how that applies in a given situation. as! SomeClass is a contract, it basically says “I guarantee that this thing is an … Read more

Auto Layout in UICollectionViewCell not working

April 21, 2023 by Tarik

Well, I just looked on the iOS developer forums. Apparently, this is a bug with the iOS 8 SDK running on iOS 7 devices. The workaround is to add the following to your subclass of UICollectionViewCell: – (void)setBounds:(CGRect)bounds { [super setBounds:bounds]; self.contentView.frame = bounds; } override var bounds: CGRect { didSet { contentView.frame = bounds … Read more