CODEWITHSUNDEEP
objective-c
Leonardo Cavalcante
Leonardo Cavalcante

Reputation: 1303

Why does my CGAffineTransformMakeTranslation doesn't work on iOS 7?

On iOS 8 this code above works properly, but not on iOS 7, anybody knows how to fix it?

- (void)scrollViewDidScroll:(UIScrollView *)scrollView{
    // headerFixed is an UIView inside of a headerView, i wanna it to be fixed on Y:0
    headerFixed.transform = CGAffineTransformMakeTranslation(0, MIN(scrollView.contentOffset.y, 0)); 
}

on iOS 8: https://www.youtube.com/watch?v=-428J20xbzM&feature=youtu.be

on iOS 7 (BUG): https://www.youtube.com/watch?v=Dd_jh0zs1f0&feature=youtu.be

Upvotes: 2

Views: 1207

Answers (1)

Nikita Ilyasov
Nikita Ilyasov

Reputation: 500

If you build your project with iOS 8 SDK, then on iOS 7 you'll have to manually convert points to pixels on retina devices;

Consider writing something like this:

CGFloat dY = MIN(scrollView.contentOffset.y, 0);
if ([UIDevice currentDevice].systemVersion.floatValue < 8) {
   dY *= [UIScreen mainScreen].scale;
}
headerFixed.transform = CGAffineTransformMakeTranslation(0, dY);

There's a chance though that turning auto layout off will be enough to fix your problem.

Upvotes: 7

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