How to scroll through actions in alert controller? Xcode 8, Swift 3, IOS

Question

Please help! :) Im a huge noobie here. I\'ve gathered this code from various sources so i don\'t really know what I\'m doing. My alert controller displays a textfield that I can

Answer 1

Although I found a way to scroll to the top of UIAlertController actions,
I don't recommend doing this, because I don't know if your app would get rejected.

I think this answer is only relevant for iOS 10+

self.present(alert, animated: true, completion: {
    //print(alert.view)                                              // _UIAlertControllerView
    //print(alert.view.subviews)                                     // [UIView]
    //print(alert.view.subviews[0].subviews)                         // [_UIAlertControllerInterfaceActionGroupView]
    //print(alert.view.subviews[0].subviews[0].subviews)             // [_UIDimmingKnockoutBackdropView, UIView]
    //print(alert.view.subviews[0].subviews[0].subviews[0].subviews) // [UIView, UIVisualEffectView]
    //print(alert.view.subviews[0].subviews[0].subviews[1].subviews) // [_UIInterfaceActionGroupHeaderScrollView, _UIInterfaceActionItemSeparatorView_iOS, _UIInterfaceActionRepresentationsSequenceView]

    // _UIInterfaceActionRepresentationsSequenceView <- This is what we want
    // In this view are all your added actions. It is a subview of UIScrollView, so just cast it and set the contentOffset to zero

    if let scrollView = alert.view.subviews[0].subviews[0].subviews[1].subviews[2] as? UIScrollView {
        scrollView.setContentOffset(.zero, animated: true)
    }
})

This may not work sometime, because I don't check if the subviews are in this order.
A future iOS update could also completely crash this method.
Also I just tested this on an iPhone. I don't know if it works on an iPad.

A more or less safe way (suggestions welcome):

self.present(alert, animated: true, completion: {
    guard alert.view.subviews.count >= 1 else { return }
    guard alert.view.subviews[0].subviews.count >= 1 else { return }
    guard alert.view.subviews[0].subviews[0].subviews.count >= 2 else { return }
    guard alert.view.subviews[0].subviews[0].subviews[1].subviews.count >= 3 else { return }

    if let scrollView = alert.view.subviews[0].subviews[0].subviews[1].subviews[2] as? UIScrollView {
        scrollView.setContentOffset(.zero, animated: true)
    }
})

Answer 2

This finds the scrollView and scrolls to the top. We search all subviews because more than one subview responds to setContentOffset, but don't bother checking which one.

- (void)methodThatCreatesTheAlertController
{
    // make the alertController here, add actions, and then...

    [self presentViewController:alertController animated:YES completion:^{
        [self scrollToTopOfAlertControllerView:alertController.view];
    }];

}

- (void)scrollToTopOfAlertControllerView:(UIView *)view
{
    for ( UIView *aSubview in view.subviews ) {
        if ( [aSubview respondsToSelector:@selector(setContentOffset:animated:)] ) {
            // _UIInterfaceActionGroupHeaderScrollView
            // _UIInterfaceActionRepresentationsSequenceView <-- this is the one that scrolls
            [((UIScrollView *)aSubview) setContentOffset:CGPointZero animated:YES];
        }
        [self scrollToTopOfAlertControllerView:aSubview]; // recurse
    }
}

Answer 3

set your alertcontroller class with this code

https://gist.github.com/petrpavlik/0c5feaada5913cafde8a