UIScrollView's origin changes after popping back to the UIViewController

Question

I have a UIViewController subclass as a scene in the storyboard that contains a UIScrollView containing various subviews. One of the subviews is a

Answer 1

Continued Issue when following the current answers:

The second attempt to open the presented view controller, without having left the presenting view controller, the problem remained. Which is why I am posting the exact steps that resulted in my solution.

1. So, I reset the collectionView's constraints in the Storyboard, making certain they were pinned to presentingViewController's main view.

2. Added: self.view.translatesAutoresizingMaskIntoConstraints = YES; inside the viewDidLoad of the presenting view controller.

3. And stored, privately, the contentOffset of the collection view prior to the modally presented view controller's appearance:

   (void)viewWillDisappear:(BOOL)animated
   {
       [super viewWillDisappear:animated];
   
       self.contentOffset = self.collectionView.contentOffset;
       self.collectionView.contentOffset = CGPointZero;
   }
   
   - (void)viewDidLayoutSubviews {
        [super viewDidLayoutSubviews];
        self.collectionView.contentOffset = self.contentOffset;
   }
   

Answer 2

- (void)viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];

    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 7) {
        _isRecoredforios6 = YES;
        _recordedOffsetforios6 = _scrollView.contentOffset;
        _recordedSizeforios6 = _scrollView.contentSize;
        _scrollView.contentOffset = CGPointZero;
    }

}

- (void)viewDidLayoutSubviews {
    [super viewDidLayoutSubviews];

    if (_isRecoredforios6) {
        _isRecoredforios6 = NO;
        _scrollView.contentSize = _recordedSizeforios6;
        _scrollView.contentOffset = _recordedOffsetforios6;
    }
}

I have fixed this ios6 bug , can be solved using these codes. I solved bug occurred in Scrollview. Thank above all my friends!

Answer 3

Unfortunately, Peter and MacMark's suggestions did not work for me (Xcode 5 w/ auto-layout). The solution was to go to the storyboard, select the view controller, and Reset to Suggested Constraints in View Controller.

Answer 4

recently , I have encountered this bug, can be solved using these codes：

// fix ios 6 bug begin
- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];

    if ([[[UIDevice currentDevice] systemVersion] floatValue] < 7) {
        isRecoredforios6 = YES;
        recordedOffsetforios6 = self.tableView.contentOffset;
        recordedSizeforios6 = self.tableView.contentSize;
    }
}

- (void)viewDidLayoutSubviews
{
    [super viewDidLayoutSubviews];
    if (isRecoredforios6) {
        isRecoredforios6 = NO;
        self.tableView.contentSize = recordedSizeforios6;
        self.tableView.contentOffset = recordedOffsetforios6;
    }
}
// fix ios 6 bug end

thanks Peter Jacobs！

Answer 5

I used a combination of the different solutions posted everywhere on SO, and came up with this subclass:

// Keeps track of the recent content offset to be able to restore the
// scroll position when a modal viewcontroller is dismissed
class ScrollViewWithPersistentScrollPosition: UIScrollView {

    // The recent content offset for restoration.
    private var recentContentOffset: CGPoint = CGPoint(x: 0, y: 0)

    override func willMove(toWindow newWindow: UIWindow?) {
        if newWindow != nil {
            // save the scroll offset.
            self.recentContentOffset = self.contentOffset
        }
        super.willMove(toWindow: newWindow)
    }

    override func didMoveToWindow() {
        if self.window != nil {
            // restore the offset.
            DispatchQueue.main.async(execute: {
                // restore it
                self.contentOffset = self.recentContentOffset
            })
        }
        super.didMoveToWindow()
    }
 }

Tested on iOS 11.2 / Xcode 9.2.

Answer 6

In iOS 7/8/9 simple self.automaticallyAdjustsScrollViewInsets = NO; solved the problem in my case.