1.viewWillDisappear popToRoot时不会调用
2.willMoveToParentViewController相比只在pop时回调，可替代更多情况下viewWillDisappear的使用场景
3.iPhonex tab present弹出框时关闭时，短暂的tab显示异常 https://stackoverflow.com/questions/46214740/ios-11-iphone-x-simulator-uitabbar-icons-and-titles-being-rendered-on-top-coveri
1.viewWillDisappear popToRoot时不会调用2.willMoveToParentViewC...
地图不能拖动问题 如果不能销毁的界面，离开界面执行[mapView viewWillDisappear]后，不要在...
– viewWillAppear: – viewDidAppear: – viewWillDisappear: –...
网上看的一个问题，看到问题后我懵圈了。。 从界面A Push到界面B： A界面的viewWillDisappear...
注意一点！！不同的方法调用父类方法的时机也不同！！！
将UINavigationController的view作为subview添加到了其他viewController...
viewWillAppear: Called when the view is about to made vis...
viewWillAppear: Called when the view is about to made vis...
viewWillAppear: Called when the view is about to made vis...
在viewWillDisappear中使用dismiss
本文标题：viewWillDisappear的问题
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