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 ...