View Callbacks
When the view hierarchy changes, callbacks can be sent to the views in question. The iOS SDK offers six callback methods. These methods may help your application keep track of views that are moving and changing parents:
didAddSubview:—Is sent to a parent view after it has successfully added a child view via addSubview: or one of the other subview insertion methods listed earlier. It lets subclasses of UIView perform additional actions when new views are added.
didMoveToSuperview:—Informs views that they’ve been reparented to a new ...
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