iPad的iOS8自动布局旋转似乎无法正确调整集合大小

Question

I have a collection view added as a subview to self.view and autolayout constraints are just stretch to edges.

I'm trying to achieve a solution where the rotation properly re-sizes the contents of the collection view.

Landscape

And then if you rotate to portrait

How can I achieve this?

The strange thing is if I present a viewcontroller modally and dismiss it, the underlying collectionView will get resized on dismissal.

Answer 1

This will help to resize the contents on rotation ` - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id)coordinator {

[coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {
    [self.collectionView performBatchUpdates:nil completion:nil];
} completion:nil];

}`