uicollectionview

问题 I have a vertical UICollectionView with each cell taking up the entire self.view.frame I can easily swipe upwards to page to the next cell, but I would like to do the same thing with the press of a button. I've tried using: - (void)setContentOffset:(CGPoint)contentOffset animated:(BOOL)animated And: - (void)scrollRectToVisible:(CGRect)rect animated:(BOOL)animated They work but they temporarily "White-Out" the currentCell to present the nextCell, while the swiping shows both cells during the

问题 I have a UICollectionView that uses a custom subclass of UICollectionViewFlowLayout to make the section headers stick to the top of the screen while scrolling just like UITableView's plain style. My code is based on this approach: http://blog.radi.ws/post/32905838158/sticky-headers-for-uicollectionview-using In addition, the collection view is set up to load more results when the user scrolls to the bottom. That is, when the user gets to the bottom of the collection view, a web request loads

问题 I have successfully implemented a UICollectionView . Is it possible to change the scrollDirection ? Can you please show how to implement it programmatically? 回答1: This is how you create it in code with UICollectionViewFlowLayout let layout = UICollectionViewFlowLayout() layout.scrollDirection = .vertical let collectionView = UICollectionView(frame: frame, collectionViewLayout: layout) or if you are working with an existent collection view if let layout = collectionView.collectionViewLayout as

问题 There is a method to get a cell by indexPath ( UICollectionView cellForItemAtIndexPath: ). But I can"t find a method to get one of the supplementary views like a header or footer, after it has been created. Any ideas? 回答1: UPDATE As of iOS 9, you can use -[UICollectionView supplementaryViewForElementKind:atIndexPath:] to get a supplementary view by index path. ORIGINAL Your best bet is to make your own dictionary mapping index paths to supplementary views. In your collectionView

问题 I want to respond to double-taps on cells in a UICollectionView, and have a double-tap action cancel cell selection. This is what I've tried: UITapGestureRecognizer *tapRecogniser = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGesture:)]; tapRecogniser.numberOfTapsRequired = 2; for (UITapGestureRecognizer *recogniser in [self.collectionView gestureRecognizers]) { [recogniser requireGestureRecognizerToFail:tapRecogniser]; } [self.collectionView

问题 I am currently trying to implement the UITableView reordering behavior using UICollectionView. Let's call a UItableView TV and a UICollectionView CV (to clarify the following explanation) I am basically trying to reproduce the drag&drop of the TV, but I am not using the edit mode, the cell is ready to be moved as soon as the long press gesture is triggered. It works prefectly, I am using the move method of the CV, everything is fine. I update the contentOffset property of the CV to handle the

问题 I have a UICollectionView and when an item is selected, I'd like it to animate full screen. So it would transition from the size of the cell to full screen and become a UIViewController. Pinterest and Evernote both have this behavior where tapping on a cell transitions the cell into a full screen view controller. Are there any example of how this is done? I've searched several projects, but haven't found any illustrating on transitioning a cell to full screen view controller. Pinterest

问题 I'm using an UICollectionView on which I want to place seven cells side by side. The whole screen should be used for this. Currently, I'm using the width of the collection view and divide it by seven. Now I get an item width of 45.71429 on an iPhone 4. Between some cells there is an interim spacing. How can I handle this? I want to fill out the whole screen and all items should have the same size. One option which comes to my mind is to round the value and use the remaining value as inset.

问题 I am trying to create this collection view cells with kinda paging behavior. In every cell; I made a card flip animation. But flip function does not work. I know that function is OK because; before I create these UICollectionViewCell model, I tried everything in UICollectionView itself and it worked out perfect. But since I need paging behavior, I need multiple pages with card view inside and in every cell when user tabs the card it should flip. So, after I migrated all the code from

问题 This isn't my desired effect. This only happens when the collection view is set to horizontal flow layout. I've seen a few other posts regarding this very same issue but none of the provided answers have worked. Has anyone found a solution? I've provided two screenshots showing a UITextField before the keyboard is triggered and after. As you can see the UITextField along with the entire collection view (which can't be seen) is pushed up along with the keyboard. Usually the keyboard is