如何在IOS中从UICollectionViewCell初始化弹出窗口视图(How to initialize popover view from UICollectionViewCell in IOS)

 我一直在跟踪使用故事板的iPad应用程序，我已经坚持了几天。 如何通过在集合视图中选择单元格来启动popover segue？ 主要问题是越过弹出窗口必须锚定到视图的错误。 
 
 该方法似乎是在视图中放置一个虚拟popoverAnchorButton （隐藏，禁用），从它创建一个segue到故事板中的弹出视图，将它放在didSelectItemAtIndexPath ，然后[self performSegue] 。 代码如下所示： 
 
- (IBAction)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

    [self.collectionView deselectItemAtIndexPath:indexPath animated:NO];
    UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];
    CGRect anchorRect = CGRectMake(cell.center.x, cell.center.y, 1.0f, 1.0f);
    self.popoverAnchorButton.frame = anchorRect;
    [self performSegueWithIdentifier:@"popoverSegue" sender:self];
}
 
 这在应用程序的其他位置在表视图中工作，因为故事板允许我在视图中删除按钮，以用作锚点。 但Xcode不允许我将一个按钮或任何其他合适的视图放入故事板中的集合视图中，因此我无法创建segue。 以编程方式创建按钮没有任何帮助，因为我无法从中构建UIStoryboardSegue，并且来自控制器的任何手动segue都会出现与缺少锚点相同的错误。 有任何想法吗？ 
 
 我认为另一条路径可能是跳过segues并以编程方式实例化popover视图控制器，但这里的包版是一个错误源于我创建的弹出视图（因为我使用的是故事板）没有xib。 我是否必须为此弹出窗口视图创建单独的xib文件？ 这是唯一的选择吗？ 

I've been tracking along with an iPad app using storyboards, and I've been stuck on this for days. How can I initiate a popover segue by selecting a cell in a collection view? The main problem is getting past the error that the popover must be anchored to a view.
 
The approach seems to be putting a dummy popoverAnchorButton (hidden, disabled) in the view, create a segue from it to the popover view in the storyboard, position it in didSelectItemAtIndexPath, and then [self performSegue]. Code looks like this:
 
- (IBAction)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath

    [self.collectionView deselectItemAtIndexPath:indexPath animated:NO];
    UICollectionViewCell *cell = [self.collectionView cellForItemAtIndexPath:indexPath];
    CGRect anchorRect = CGRectMake(cell.center.x, cell.center.y, 1.0f, 1.0f);
    self.popoverAnchorButton.frame = anchorRect;
    [self performSegueWithIdentifier:@"popoverSegue" sender:self];
}
 
This works elsewhere in the app in a table view, because the storyboard lets me drop a button in the view, to use as an anchor point. But Xcode doesn't let me drop a button or any other suitable view into the collection view in the storyboard, so I can't create the segue. Creating the button programmatically is no help, because I can't build a UIStoryboardSegue from it, and any manual segue from the controller gives the same error about lacking an anchor point. Any ideas?
 
I think another path could be to skip segues and instantiate the popover view controller programmatically, but the roadblock here is an error stemming from the fact that the popover view I create (since I'm using storyboards) has no xib. Do I have to create a separate xib file just for this popover view? Is that the only option? 

原文：https://stackoverflow.com/questions/21566387