iosswiftuinavigationbarscrollviewpreferslargetitles

UIScrollView + LargeTitle (iOS 11) - scroll to top and reveal the large title

I use the following code to scroll to top of the UICollectionView:

scrollView.scrollRectToVisible(CGRect(origin: .zero, size: CGSize(width: 1, height: 1)), animated: true)

However, on iOS 11 and 12 the scrollView only scrolls to the top, without revealing the large title of the UINavigationBar (when prefersLargeTitle has ben set to true.)

Here is how it looks like: enter image description here

The result I want to achieve:

enter image description here

Solution

  • It works as it is designed, you are scrolling to position y = 0, assign your controller to be UIScrollView delegate and print out scroll offset:

    override func scrollViewDidScroll(_ scrollView: UIScrollView) {
    print(scrollView.contentOffset)
}

    You will see when Large title is displayed and you move your scroll view a but and it jumps back to the Large title it will not print (0.0, 0.0) but (0.0, -64.0) or (0.0, -116.0) - this is the same value as scrollView.adjustedContentInset, so if you want to scroll up and display large title you should do: 

    scrollView.scrollRectToVisible(CGRect(x: 0, y: -64, width: 1, height: 1), animated: true)