ios viewcontroller

许久没有看过viewcontroller，由于项目原因，重新温习了下，现在整理下

生命周期

启动到显示

• init
• willMoveToParentViewController
• loadView
• viewDidLoad
• viewWillAppear
• updateViewConstraints
• viewWillLayoutSubviews
• viewDidLayoutSubviews
• viewDidAppear

退出到销毁

• didMoveToParentViewController
• viewWillDisappear
• viewDidDisappear
• dealloc

作为子控制，加入到父控制器上，分三步，周期如下

OneViewController *one = [[OneViewController alloc] init];
* init

[self addChildViewController:vc];
* willMoveToParentViewController
* loadView
* viewDidLoad

[self.view addSubview:vc.view];
* viewWillAppear
* updateViewConstraints
* viewWillLayoutSubviews
* viewDidLayoutSubviews
* viewDidAppear

响应链

//是否响应该手势，但只要手势开始调用，用于确定响应的view，与GestureRecongizer一样

• hitTest:withEvent
• pointInside:withEvent