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ViewController加载过程（ShowViewCycle是ViewController.view的subView）：
1. -[ViewController initWithNibName:bundle:] [Line 82] nibNameOrNil:(null), nibBundleOrNil:(null)
ViewController初始化方法, ViewController安一下顺序在 mainBundle 中 (因第二个参数 nibBundle 也指定为 nil) 搜索 NIB 文件:
参数nibBundleOrNil：指定nib文件搜索的bundle，默认位mainBundle
参数nibNameOrNil：指定nib文件的名称，如果不指定，则先搜索View.nib，再搜索 ViewController.nib
2. -[ViewController loadView] [Line 100]
在self.view==nil的条件下调用
3. -[ViewController willMoveToParentViewController:] [Line 363]
3.1 -[ShowViewCycle initWithFrame:] [Line 49]
3.2 -[ShowViewCycle setNeedsDisplay] [Line 259]
ShowViewCycle的属性改变都会触发setNeedsDisplay
3.3 -[ShowViewCycle setNeedsDisplay] [Line 259]
3.4 -[ShowViewCycle setNeedsDisplay] [Line 259]
3.5 -[ShowViewCycle willMoveToSuperview:] [Line 174]
3.6 -[ShowViewCycle didMoveToSuperview] [Line 181]
3.7 -[ShowViewCycle setTranslatesAutoresizingMaskIntoConstraints:]
mas_makeConstraints主动触发
3.8 -[ShowViewCycle isDescendantOfView:] [Line 200]
addConstraint，会触发该判定，判定一个view是否是另一个view的subview
3.9 -[ShowViewCycle isDescendantOfView:] [Line 200]
3.10-[ShowViewCycle isDescendantOfView:] [Line 200]
3.11-[ShowViewCycle isDescendantOfView:] [Line 200]
4. -[ViewController viewDidLoad] [Line 107]
5. -[ViewController shouldAutomaticallyForwardAppearanceMethods] [Line 336]
返回值如果是NO，子类必须重写- viewWillAppear: -viewDidAppear: -viewWillDisappear: -viewDidDisappear: -willRotateToInterfaceOrientation:duration: -willAnimateRotationToInterfaceOrientation:duration: -didRotateFromInterfaceOrientation:方法
6. -[ViewController viewWillAppear:] [Line 159]
7. -[ViewController beginAppearanceTransition:animated:] [Line 298]
8. -[ViewController shouldAutomaticallyForwardAppearanceMethods] [Line 336]
8.1 -[ShowViewCycle willMoveToWindow:] [Line 188]
8.2 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
8.3 -[ShowViewCycle needsUpdateConstraints] [Line 375]
8.4 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
8.5 -[ShowViewCycle isDescendantOfView:]
8.6 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
8.7 -[ShowViewCycle isDescendantOfView:] [Line 200]
8.8 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
8.9 -[ShowViewCycle isDescendantOfView:] [Line 200]
8.10-[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
8.11-[ShowViewCycle isDescendantOfView:] [Line 200]
8.12-[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
8.13-[ShowViewCycle didMoveToWindow] [Line 195]
9. -[ViewController viewWillLayoutSubviews] [Line 188]
9.1 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.2 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.3 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.4 -[ShowViewCycle intrinsicContentSize] [Line 451]
内在内容的大小
9.5 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.6 -[ShowViewCycle updateConstraints] [Line 370]
9.7 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.8 -[ShowViewCycle alignmentRectInsets] [Line 434]
9.9 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.10-[ShowViewCycle alignmentRectInsets] [Line 434]
9.11-[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.12-[ShowViewCycle alignmentRectInsets] [Line 434]
9.13-[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
9.14-[ShowViewCycle alignmentRectInsets] [Line 434]
10. -[ViewController updateViewConstraints] [Line 387]
10.1 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
10.2 -[ShowViewCycle alignmentRectInsets] [Line 434]
11. -[ViewController viewDidLayoutSubviews] [Line 196]
11.1 -[ShowViewCycle layoutSubviews] [Line 231]
11.2 -[ShowViewCycle drawRect:] [Line 252]
12. -[ViewController shouldAutomaticallyForwardAppearanceMethods] [Line 336]
13. -[ViewController viewDidAppear:] [Line 166]
14. -[ViewController didMoveToParentViewController:] [Line 370]
15. -[ViewController viewWillLayoutSubviews] [Line 188]
16. -[ViewController updateViewConstraints] [Line 387]
16.1 -[ShowViewCycle translatesAutoresizingMaskIntoConstraints] [Line 393]
16.2 -[ShowViewCycle alignmentRectInsets] [Line 434]
17. -[ViewController viewDidLayoutSubviews] [Line 196]
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原文地址：http://www.cnblogs.com/StarMud/p/4597215.html
