uicollectionview

问题 I am trying to create a simple gallery for an iOS application. I'm working with a UICollectionView inside of a ViewController. Everything seems to be working fine, but I can't get the image I'm trying to use to display inside of the collection view cell. I will just dump some code here, I have been desperate to find a solution but nothing seems to work. This is the gallery.m file: -(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView; { //just a random value for

问题 I am new for IOS development , and I try to use UIcollectionView to show the photo without using storyboard . I create a xib file call AITFileCell_grid.xib , and add a Collection View Cell . I also create another xib file and add the Collection View for loading Collection View Cell . I want to selected multiple file and delete them by delete button . But I can not get the cell when I click the delete button by following code. if(self.collectionView.indexPathsForSelectedItems > 0){ NSLog(@

问题 I am using UICollectionView where cell's are almost square, but original image is rectangle. Therefore, when I display image as follows, it is getting cut. Is there a way to handle this issue? I am currently working on Objective-C but I am to see Swift solution as well. cell.productImage content mode is Aspect Fill cell.productImage.image = [cell.productImage.image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate]; 回答1: Please add this line to your code. cell.productImage.contentMode

问题 I'm using a collection view inside a normal view controller using the collection view delegate and data source. I'm using the sizeForItemAtIndexPath but it doesn't resize the cell. let screenSize: CGRect = UIScreen.main.bounds func collectionView(_collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize { return CGSize(width: screenSize.width / 3, height: screenSize.width / 3) } The collection view is

问题 I've got a problem, i want make CollectionView like a 'chat'. Than i should reverse Layout of UICollectionView . Can i configure layout that contentOffset = (0; 0) will be on bottom UICollectionView (and important i can't transform CollectionView)? Like -> constenOffset = (0; 1000) (for example) | ... | | 2 | | 1 | | 0 | -> constentOffset = (0; 0) Also I tried to rotate UITableView but in this case reloadSection animation does not satisfy me. 回答1: UICollectionView with a reversed flow layout.

问题 I have a custom horizontal collection view that has 1 row and I want to add pull to refresh functionality which, by default, appears above my row of cells. I would like the user to be able to pull the collection view from left to right to activate the UIRefreshControl. Any ideas? 回答1: For this you need to implement the UIScrollViewDelegate method - (void)scrollViewDidScroll:(UIScrollView *)scrollView { CGPoint offset = scrollView.contentOffset; CGRect bounds = scrollView.bounds; CGSize size =

问题 I have a UICollectionView that is using UICollectionViewFlowLayout to print a grid of cells to the screen. I configured the layout to flow horizontally & now I need to add a header to each section. My main issue is with the location of the header which is to the left of the section while I want it to be on top of the section (similar to what it would be if the layout was configured to flow vertically). Is there a way to do that short of creating my own UICollectionViewFlowLayout subclass? and

问题 Good afternoon. I've struggled with this "feature" for my iOS app for some hours now and I'm in need of some help. Question: How should I implement so that when a user types in the UITextView increases in size (only the bottom margin) and the cell increases its height to fit the UITextView dynamically meanwhile? I can't figure out how to tackle it. Research: After some searching I came upon Dynamically change cell's height while typing text, and reload the containing tableview for resize as

问题 I am using collectionView in my App. I am setting image for the cell backgroundView in didSelect delegate. But When i select one cell indexPath the image is getting set for 3 cell indexPath. When i scroll the collectionView the images are getting changed randomly? Please Help me. thanks in advance. - (void)viewDidLoad { [super viewDidLoad]; [collection registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:uio]; } - (NSInteger)collectionView:(UICollectionView *)collectionView

问题 I have UICollectionView in which I have a prototype cell and UIImageView in it.I am displaying random images in UICollectionView . Now I want to exchange position of UIImageView by swiping it to near cell.I have tried swipe gesture and long press gesture.Code is given below which I have done: - (IBAction)LongPress:(UILongPressGestureRecognizer *)sender { if (sender.state != UIGestureRecognizerStateEnded) { return; } CGPoint p = [sender locationInView:self.collectionView]; NSIndexPath