Yevgen Pogribnyi 7f01b89ddc [ASDisplayNode] Provide safeAreaInsets and layoutMargins bridge (#685) ...

* [ASDisplayNode] Add safeAreaInsets, layoutMargins and related properties to ASDisplayNode

* Add layoutMargins bridged to the underlying view

* Add safeAreaInsets bridged to the underlying view

* Add fallback calculation of safeAreaInsets for old iOS versions

* Add automaticallyRelayoutOnSafeAreaChanges and automaticallyRelayoutOnLayoutMarginsChanges properties

* Add additionalSafeAreaInsets property to ASViewController for compatibility with old iOS versions

* Provide safeAreaInsets for layer-backed nodes.

This also fixes tests.

* Fix crash when insetsLayoutMarginsFromSafeArea is set from a background thread

* Changes requested at code review:
* Update documentation for layoutMargins and safeAreaInsets properties. Suggest that users set the automaticallyRelayout* flags to ensure that their layout is synchronized to the margin's values.
* Fix accessing ASDisplayNode internal structures without a lock.
* Add shortcut in -[ASDisplayNode _fallbackUpdateSafeAreaOnChildren] to skip a child when possible.
* Add shortcut in ASViewController to avoid fallback safe area insets recalculation in iOS 11. Fix fallback safe area insets recalculation when the additionalSafeAreaInsets are set.
* Add debug check that a view controller's node is never reused without its view controller, so the viewControllerRoot flag value is always consistent.
* Use getters instead of reading ivars directly in -layoutMarginsDidChange and -safeAreaInsetsDidChange.

* Minor change in CHANGELOG

* Minor change in ASDisplayNodeTests.mm

2018-03-27 14:29:17 +01:00

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