Change UIImageView height on scroll

Question

I need to resize imageview on scroll and tried some answers in stackoverflow but failed to implement those. Not sure what did I missed, please advice.

-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
    int scrollY = scrollView.contentOffset.y;
    if (scrollY > 0) {
        _coverImgView.frame = CGRectMake(0, 23 + scrollY, 375, 139 - scrollY);
        _coverImgView.center = _coverImgView.superview.center;
    }
}

Sharing current configuration of my UIImageView

Also sharing UI

Let me know, your suggestions on this. Expecting UIImageView to reduce height onscroll.

Answer 1

When using auto-layout you shouldn't be directly setting the frame of any of your views, you should be changing the layout constraint constants to reposition and size your views and then updating the layout.

So, change the 'top' and 'height' constraints each time the delegate method is called, then layoutIfNeeded .