Custom container view controller can't notify of contained views of safe area to lay out

Originator:m.quinones.garcia
Number:rdar://32661598 Date Originated:08/06/2017
Status:Open Resolved:
Product:UIKit Product Version:iOS 11 beta SDK
Classification:Suggestion Reproducible:
 
Area:
UIKit

Summary:
Currently the API In UIKit (as of iOS11) doesn't allow for custom container view controllers to notify contained views/viewcontrollers to layout or adjust insets. The properties just allow to turn settings off.

The API 'safeAreaInsets' and `safeAreaLayoutGuide` in UIView is read-only, so custom containers are not able to set it to desired values based on the chrome it has. The new API for UIScrollView `frameLayoutGuide` is also read-only.

Ideally the APIs would allow to implement behaviour similar to what UINavigationController and UITabbarController do.

Steps to Reproduce:
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Expected Results:
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Observed Results:
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Version:
iOS 11 SDK (beta)

Notes:
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Configuration:
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Comments


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