The Uiviewcontroller life cycle needs to be noted

@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.

If no view is generated, then Self.view calls [self Loadview], then ...

(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, which is after the view is set.

Then call Viewdidload, note that this is After-loadview.

Summary, Self.view->[self loadview]->[self viewdidload].

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The Uiviewcontroller life cycle needs to be noted