CODEWITHSUNDEEP
objective-ciosuicollectionview
Stefan Ivanov
Stefan Ivanov

Reputation: 53

Detect end of implicit animation when changing the UICollectionViewLayout

I am currently working with UICollectionView and after changing the layout from one to another with setCollectionViewLayout:animated: I want to execute some code upon the completion of the animation. Any idea how to achieve that?

Cheers,

Upvotes: 3

Views: 871

Answers (2)

George WS
George WS

Reputation: 4093

Just for the record, there is now a -setCollectionViewLayout:animated:completion: method on UICollectionView, introduced in iOS 7.

Upvotes: 4

TheoB
TheoB

Reputation: 172

I found that to be able to control the animation, rather than using the implicit one with setCollectionViewLayout:animated: you can use a standard UIView animationWithDuration and change the layout in the animations block, like this:

[UIView animateWithDuration:0.4
                      delay:0
                    options:UIViewAnimationCurveEaseOut
                 animations:^{
                     self.oldView.collectionViewLayout = self.otherLayout;
                     self.newView.alpha = 1.0;
                 }
                 completion:^(BOOL finished){
                     self.oldView.alpha = 0.0;
                     self.otherLayout = nil;
                 }];

I don't know if it is the recommended way to do it but it lets you control the animation and execute code upon completion.

Upvotes: 3

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