Creating UIView Programmatically
-(void)initWithFrame
From nib file
-(void)initWithCoder
-(void)awakeFromNib
Custom drawing
-(void)drawRect
Custom layout
-(void)layoutSubviews
Handle touch-based events
-(void)touchesBegan:withEvent:
-(void)touchesMoved:withEvent:
-(void)touchesEnded:withEvent:
-(void)touchesCancelled:withEvent:
