UIViewController的生命周期为下图所示:
一个UIViewController从Disappeared到Appeared的顺序为:viewWillAppear - viewDidAppear。
从Appeared到Disappeared的顺序为:viewWillDisappeared - viewDidDisappear。
UIViewController的生命周期为下图所示:
一个UIViewController从Disappeared到Appeared的顺序为:viewWillAppear - viewDidAppear。
从Appeared到Disappeared的顺序为:viewWillDisappeared - viewDidDisappear。