uicollectionview

问题 I am trying to display download progress in my collectionview cells. Im currently using the parse progressblock which has an instance of the cell and updates the progress bar. }, progressBlock: { (percent) in self.mainQueue.addOperation { // set the downloadProgess var to update from cellForItemAt // downloadProgress = (Float(percent) / Float(100)) if let downloadingCell = self.collectionView.cellForItem(at: self.indexPath) as? InnerCollectionCell { downloadingCell.progressBar.isHidden =

问题 Is that possible to do drag and reorder from one section to another section from collectionview - iOS 9. Every time am dragging from 1st section to drop at 4th section am getting below crash, Assertion failure in -[UICollectionView _endItemAnimationsWithInvalidationContext:tentativelyForReordering: func collectionView(collectionView: UICollectionView, moveItemAtIndexPath sourceIndexPath: NSIndexPath,toIndexPath destinationIndexPath: NSIndexPath) { let sequence = ArrayrelatedSequence

问题 I would like to have a UICollectionView that, in the first row there is a cell with all the row's width, and the second row has 3 cells. I have researched the documentation but I'm not able to do it. Something like this: Thanks in advance 回答1: Make 2 Cell prototypes in collection view in your storyboard, and set them reuse identifiers In your ViewController's .m file implement this functions - (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView { return 1; } -

问题 I have ios UICollectionView with Flow layout with horizontal scroll direction. In this situation typical header position is on the left side of cells. I want to make header on the top of section cells Have you any idea how can I do this? 回答1: I think you can get what you need using standard behavior for the header. Set it up (probably in viewDidLoad): UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init]; flowLayout.headerReferenceSize = CGSizeMake(self

问题 I have a UIView in which I am adding a UICollectionView to act as a banner view to look like a carousel. The Viewcontroller in which UIView is present, is part of pageviewcontroller . PageVC --> UIViewController --> UIView --> UICollectionView . Each VC has its own banner, so when the page is swiped, I reload the collectionView with the respective data and I am able to see it. Now if visit a page which I already visited, the collectionview cell disappears. The collectionview is visible but

问题 Basically, I am trying to obtain something similar to the result of this : http://ashfurrow.com/blog/putting-a-uicollectionview-in-a-uitableviewcell how ever, i'm want 2 collectionsViews, 1 in first section and another in 2nd section how do i achieve this ? i'm bashing my head in here... each time i try to set delegate and datasource it fails and says i need to register a nib Also i have no idea how i separate the collection views in it's cellForRowAtIndexPath, how can i see which one is

问题 I have an UICollectionView with three different prototype cells, each of which with different heights set via Storyboard. During runtime, the Collection View uses its own cell size, ignoring my Storyboard ones. I am currently using collectionView:layout:sizeForItemAtIndexPath: with a couple conditionals to set each CGSize straight. Is there a better way to set the cell sizes? I don't seem to be able to retrieve the Storyboard size each cell has, and CGSizeMake seems too hardcoded and not

问题 My question is fairly straightforward. I have a UIViewController containing a UICollectionView. In initialising my cells, I add a gesture recogniser to each of them so that when you tap and hold it calls a function with a selector. This function then creates a UIAlertController which I want to present. (Basically, you hold a cell, it asks you if you want to delete it and if you say yes it eliminates it from the CollectionView) The problem is that I can't present a UIAlertController from my

问题 I am trying to implement a custom selection style for my cells in a UICollectionView. Even though it is easily possible to do this manually in the didSelect and didDeSelect methods I would like to achieve this by manipulating the "selected" variable in UICollectionViewCell. I have this code for it: override var selected: Bool { get { return super.selected } set { if newValue { self.imageView.alpha = 0.5 println("selected") } else if newValue == false { self.imageView.alpha = 1.0 println(

问题 I know this is fairly easy for UITableViewCells but I'm not sure how to approach this using a UICollectionView. EDIT. Pictures for clarification. Text content of the cells are not the same here but they should be. In landscape: In portrait: I tried to naively switch the color of my cell's text label with the cell's background color based on the index path's row property in the cellForItemAtIndexPath: method. However Index Path's row property isn't really a row in UICollectionViewFlowLayout.