• – viewWillAppear:
• – viewDidAppear:
• – viewWillDisappear:
• – viewDidDisappear:

导航

正常交互:

push一个VC的执行顺序A->B:

1. A viewWillDisappear
2. B viewWillAppear
3. A viewDidDisappear
4. B viewDidAppear

取消手势返回A->B->A

执行顺序

1. A viewWillDisappear
2. B viewWillAppear
3. B viewWillDisappear
4. B viewDidDisappear
5. A viewWillAppear
6. A viewDidAppear

页面滚动

UIPageViewControllerTransitionStyleScroll:

正常交互A->B:

1. B viewWillAppear
2. A viewWillDisappear
3. B viewDidAppear
4. A viewDidDisappear

取消滚动A->B->A:

1. B viewWillAppear
2. A viewWillDisappear
3. A viewWillAppear
4. A viewDidAppear
5. B viewWillDisappear
6. B viewDidDisappear

翻页

UIPageViewControllerTransitionStylePageCurl

正常顺序A->B

1. B viewWillAppear
2. A viewWillDisappear
3. A viewDidDisappear
4. B viewDidAppear

取消翻页A->B->A:

1. B viewWillAppear
2. A viewWillDisappear
3. B viewWillDisappear
4. A viewWillAppear
5. B viewDidDisappear
6. A viewDidAppear
   参考:
   The Inconsistent Order of View Transition Events