uicollectionviewcell

问题 I'm making use of UICollectionView and I need to scroll to first cell after click in a button. The button is located in a (big) header section in my collection view... when clicking int it, I need scroll to my first cell located bellow of this button. I created a action of this button, but I don't know how to scroll to first UICollectionViewCell. Can someone help me? 回答1: Use this delegate method, setting the indexPath at the first position: Swift self.collectionView?.scrollToItemAtIndexPath

问题 This is refrence link: https://www.raywenderlich.com/107439/uicollectionview-custom-layout-tutorial-pinterest I have implemented load more in UICollectionView at last cell , the data is getting downloaded, after download complete i want to reload collection collectionView.collectionViewLayout.invalidateLayout() self.collectionView.reloadData() let concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) dispatch_async(concurrentQueue) { DataManager.sharedInstance

问题 So I have a UICollectionView and a custom cell and it all shows up and works great. I register the class in viewDidLoad: myCollectionView = [[UICollectionView alloc] initWithFrame:collectionViewFrame collectionViewLayout:layout]; [myCollectionView setDataSource:self]; [myCollectionView setDelegate:self]; [myCollectionView setBackgroundColor:[UIColor myColor]]; [myCollectionView registerClass:[SBCustomCell class] forCellWithReuseIdentifier:@"Cell"]; In my cellForItemAtIndexPath method I

问题 I'm trying to figure out how to setup the frame of the UICollectionView cell to the frame of the view (similar of how photo app) but I need to do it programmatically. Any of you knows how can I do this? I'll really appreciate your help. 回答1: You can use the sizeForItemAt indexPath method on UICollectionViewDelegateFlowLayout . This will determine the size of each cell, and can be configured to be relative to the size of other elements (like your view , for example). func collectionView(_

问题 I created a Collection View using purely the storyboard interface builder. This is what the storyboard looks like: My collection view's properties are default as well. I haven't written anything into my ViewController.swift yet. For some reason, when I run on my phone / emulator, none of the buttons are showing. 回答1: Just configure the collectionView properly see below code and image: Implement the delegate methods of collectionView : class yourClassController: UICollectionViewDataSource,

问题 I create a UIProgressView inside UICollectionViewCell, I try to setFrame for UIProgressView to change position in UICollectionViewCell but when do that, some cells not display progressView. When I delete setFrame, It's OK but default width at the top of UICollectionViewCell What's the problem?How to change UIProgressView size, origin? Please help! //Cell:UICollectionViewCell //Cell.m - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { //ProgressView self

问题 I have collectionView Cell In that i have this text,I want to blur the text as shown in image. I have tried Using UIVisualEffect but i didnt get exact response. Code: UIGraphicsBeginImageContext(self.bounds.size); [self.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //Blur the UIImage with a CIFilter CIImage *imageToBlur = [CIImage imageWithCGImage:viewImage.CGImage]; CIFilter

问题 I have a problem managing my UICollectionsView with flowlayout and orientation. Basically, the problems happens when I switch to landscape, some of the UICollectionViewCells are missing. They reappear once I start scrolling. It should be able to show all the cell since there is so much more room on the contentSize. I even tried in my layout: - (BOOL) shouldInvalidateLayoutForBoundsChange:(CGRect)newBounds { return YES; } With the same results. Anyone have any ideas on this problem? I included

问题 I have a UICollectionViewCell in storyboard the cell. The cell size is 45 for first 6 cells and 50 for the last cell. Storyboard cell size has width = 60. The following issue occurs when running on iOS Simulator 4s. If you see the cell at location 2,4,6 there is a red background of UICollectionView. I get the following in layoutSubView of the subclass. Frame = {{0, 0}, {50, 60}} Frame = {{0, 0}, {45, 60}} Frame = {{0, 0}, {45, 60}} Frame = {{0, 0}, {45, 60}} Frame = {{0, 0}, {45, 60}} Frame =

问题 I have a UITableViewCell which shows either an image or text. I have set my UIImageView height and width to <= 150 so that it wouldn't affect the cell height in case the image isn't present but the text is. (this is a messaging app) Now my problem is, the cell does not show the image after it's loaded and user needs to go back, and view this screen again in order to see the image. How should i solve this? Before Image is loaded: After the image is successfully loaded: as u can see, it doesnt