UIViewController 中常见时序记录（layoutSubViews 与 XXXXappear/disappear 相关）

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1. UIViewController 中 layoutSubViews 的时序

假如 UIViewController 中的 Xib 中的尺寸是 (375, 667)。

iOS 8.x 的 5S 设备上的时序如下：

2016-04-05 15:43:23.637 AutoLayoutDemo[2185:1619209] after super viewDidLoad: {{0, 0}, {375, 667}}2016-04-05 15:43:23.638 AutoLayoutDemo[2185:1619209] before super viewWillAppear: {{0, 0}, {320, 568}}2016-04-05 15:43:23.638 AutoLayoutDemo[2185:1619209] after super viewWillAppear: {{0, 0}, {320, 568}}2016-04-05 15:43:23.644 AutoLayoutDemo[2185:1619209] before super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:23.644 AutoLayoutDemo[2185:1619209] after super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:23.644 AutoLayoutDemo[2185:1619209] before super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:43:23.645 AutoLayoutDemo[2185:1619209] after super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:43:23.645 AutoLayoutDemo[2185:1619209] before super viewDidLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:23.645 AutoLayoutDemo[2185:1619209] after super viewDidLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:24.147 AutoLayoutDemo[2185:1619209] before super viewDidAppear: {{0, 0}, {320, 568}}2016-04-05 15:43:24.147 AutoLayoutDemo[2185:1619209] after super viewDidAppear: {{0, 0}, {320, 568}}2016-04-05 15:43:24.148 AutoLayoutDemo[2185:1619209] before super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:24.148 AutoLayoutDemo[2185:1619209] after super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:24.148 AutoLayoutDemo[2185:1619209] before super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:43:24.148 AutoLayoutDemo[2185:1619209] after super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:43:24.148 AutoLayoutDemo[2185:1619209] before super viewDidLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:43:24.148 AutoLayoutDemo[2185:1619209] after super viewDidLayoutSubviews: {{0, 0}, {320, 568}}

iOS 9.x 的 5S 设备上的时序如下：

2016-04-05 15:50:38.560 AutoLayoutDemo[2464:1661823] after super viewDidLoad: {{0, 0}, {375, 667}}2016-04-05 15:50:38.560 AutoLayoutDemo[2464:1661823] before super viewWillAppear: {{0, 0}, {375, 667}}2016-04-05 15:50:38.561 AutoLayoutDemo[2464:1661823] after super viewWillAppear: {{0, 0}, {375, 667}}2016-04-05 15:50:38.565 AutoLayoutDemo[2464:1661823] before super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:50:38.566 AutoLayoutDemo[2464:1661823] after super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:50:38.566 AutoLayoutDemo[2464:1661823] before super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:38.566 AutoLayoutDemo[2464:1661823] after super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:38.566 AutoLayoutDemo[2464:1661823] before super viewDidLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:38.567 AutoLayoutDemo[2464:1661823] after super viewDidLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:39.072 AutoLayoutDemo[2464:1661823] before super viewDidAppear: {{0, 0}, {320, 568}}2016-04-05 15:50:39.072 AutoLayoutDemo[2464:1661823] after super viewDidAppear: {{0, 0}, {320, 568}}2016-04-05 15:50:39.073 AutoLayoutDemo[2464:1661823] before super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:50:39.073 AutoLayoutDemo[2464:1661823] after super updateViewConstraints: {{0, 0}, {320, 568}}2016-04-05 15:50:39.073 AutoLayoutDemo[2464:1661823] before super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:39.073 AutoLayoutDemo[2464:1661823] after super viewWillLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:39.073 AutoLayoutDemo[2464:1661823] before super viewDidLayoutSubviews: {{0, 0}, {320, 568}}2016-04-05 15:50:39.073 AutoLayoutDemo[2464:1661823] after super viewDidLayoutSubviews: {{0, 0}, {320, 568}}

2. UIViewController 中 XXXXappear/disappear 的时序

VCA push VCB:

VCA========viewWillDisappear:VCB========viewWillAppear:VCA========viewDidDisappear:VCB========viewDidAppear:

VCB pop to VCA:

VCB========viewWillDisappear:VCA========viewWillAppear:VCB========viewDidDisappear:VCA========viewDidAppear:

VCA present to VCB

VCA========viewWillDisappear:VCB========viewWillAppear:VCB========viewDidAppear:VCA========viewDidDisappear:

VCB dismiss to VCA

VCB========viewWillDisappear:VCA========viewWillAppear:VCA========viewDidAppear:VCB========viewDidDisappear:

UITabController 中 VCA(UINavigationController 的 rootViewController) 切换到 VCB(UINavigationController 的 rootViewController) 的 tab：
- VCB 所在 tab 第一次切换过去：
```
VCA========viewWillDisappear:VCB========viewWillAppear:VCA========viewDidDisappear:VCB========viewDidAppear:
```
- VCB 所在 tab 之前切换过去过：
```
VCB========viewWillAppear:VCA========viewWillDisappear:VCA========viewDidDisappear:VCB========viewDidAppear:
```

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