UIView: Notification for view loaded

Depending on what kind of actions you need to perform, there are several techniques:

• -(id)initWithFrame:(CGRect)frame - UIView's designated initializer; always sent to a UIView to initialize it, unless the view is loaded from a nib;
• -(id)initWithCoder:(NSCoder *)coder - always sent to initialize a UIView whenever the view is loaded from a nib;
• -(void)awakeFromNib - sent after all the objects in the nib are initialized and connected; applicable only if you load the object from a nib; you must call super;
• -(void)willMoveToSuperview:(UIView *)newSuperview - sent immediately before the view is added as a subview to another view; newSuperview may be nil when you remove the view from its superview;
• -(void)willMoveToWindow:(UIWindow *)newWindow - sent immediately before the view (or its superview) is added to a window; newWindow may be nil when you remove the view from a window;
• -(void)didMoveToSuperview - sent immediately after the view is inserted into a view hierarchy;
• -(void)didMoveToWindow - sent immediately after the view gets its window property set.

Basically, you can choose to perform your actions during initialization (1 & 2), after loading from a nib (3), before insertion into a view hierarchy (4 & 5) and after that (6 & 7).

via:http://stackoverflow.com/questions/4501974/uiview-how-to-get-notified-when-the-view-is-loaded