@property(nonatomic,retain) UIView *view; // The getter first invokes [self loadView] if the view hasn‘t been set yet. Subclasses must call super if they override the setter or getter.
如果没有生成view，那么self.view会先调用[self loadView],然后。。。
(void)viewDidLoad; // Called after the view has been loaded. For view controllers created in code, this is after -loadView. For view controllers unarchived from a nib, this is after the view is set.
总结，self.view->[self loadView]->[self viewDidLoad]。
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原文：http://blog.csdn.net/winsdom123456/article/details/47976329