Open Radar

 
Area:
UIKit

Summary:
In some situations, an interface may be served by nesting a UIStackView inside a touchable container view. Currently, if a touch inside a stack view does not pass the hitTest: for any subview, the stack view itself consumes the touch, preventing it from bubbling up to any container view.

Steps to Reproduce:
1. Open attached Untouchables.xcodeproj
2. Build and run.
3. Touch the button and see that it behaves as expected.
4. Touch either yellow area around the button, which are non-interactive UIView instances.

Expected Results:
The touch should have bubbled up to the container Control, which flashes itself red when touched.

Actual Results:
The UIStackView consumes the touch, so it can't bubble up.

Now go into HackStackView.swift, and uncomment the hitTest(...) override. This workaround eliminates the UIStackView itself from consideration as a legitimate hit.

Build and run again, and tap the yellow area. See how the background red illuminates behind the button.

It seems like UIStackView should always disregard itself as a hit target.


Version:
iOS 10.3

Notes:


Configuration:
iPhone 7 Simulator

Attachments:
'Untouchables.zip' was successfully uploaded.