iOS 8 GM不会更新集合视图的约束

Question

In Xcode 6 Beta 7 and all versions before it, I had a collection view that would update its constraints on its cells when an iPad would rotate between landscape and portrait. Now, it doesn't update at all, and in fact it looks exactly like how I leave it in the XIB, which implies to me that it's not updating at all. It appears that the reusable views I'm using are updating correctly, but the cells certainly are not.

Has anyone else run into this issue yet? Anyone have any ideas for how to get past it?

I'm using the iOS 7.1 simulator.

Answer 1

You need to make a subclass of UICollectionViewCell and make that subclass as the superclass of ALL of your cells.

Example:

@interface MDTCollectionViewCell : UICollectionViewCell
@end

@implementation MDTCollectionViewCell

- (void)setBounds:(CGRect)bounds {
    [super setBounds:bounds];
    self.contentView.frame = bounds;
}

@end

Answer 2

Override the custom cell's layoutSubviews as a temporary fix:

override func layoutSubviews() {
    contentView.frame = bounds
    super.layoutSubviews()
}

Answer 3

我提出的解决方法是使用8.0模拟器在sim中进行测试，并使用Xcode Beta 7构建可部署。当我使用Beta 7构建时，应用程序在使用iOS 7的设备上运行时没有此问题。但是，这对部署到应用程序商店的任何人都没有帮助，所以如果这种解决方法对您的情况不起作用，我会道歉。

Answer 4

in my UICollectionViewCell class I added

override func layoutSubviews() {
    contentView.frame = bounds
    super.layoutSubviews()
}

and I used this code to refresh

dispatch_async(dispatch_get_main_queue(), { () -> Void in
    // in this case vController is UICollectionView
    self.vController.reloadData()
    self.vController.layoutSubviews()
})