1016-06-homepage 20-encapsulation toolbar-controls with controls are 0 away from the top when viewDidLoad is enabled. When viewWillAppear or viewDidAppear is reached, 64 is added to viewdidappear.

1016-06-homepage 20-encapsulation toolbar-controls with controls are 0 away from the top when viewDidLoad is enabled. When viewWillAppear or viewDidAppear is reached, 64 is added to viewdidappear.

}

 

 

 

--------------------------------------------

Why should I change the y value before calling the parent class setFrame?

--------------------------------------------

 

It is best to set the frame of the sub-control in layoutSubViews. The frame passed in initWithFrame is 0 by default, because when calling init, initWithFrame is called, and the frame passed in is 0;

LayoutSubViews can obtain the width and height of the control.