在ViewDidLoad方法里面设置按钮图案

 

 

- (void)viewDidLoad

{

UIImage *buttonImageNormal = [UIImage imageNamed:@"whiteButton.png"];

UIImage *stretchableButtonImageNormal = [buttonImageNormal 

stretchableImageWithLeftCapWidth:12

topCapHeight:0];

[doSomethingButton setBackgroundImage:stretchableButtonImageNormal

forState:UIControlStateNormal];

UIImage *buttonImagePressed = [UIImage imageNamed:@"blueButton.png"];

UIImage *stretchableButtonImagePressed = [buttonImagePressed

  stretchableImageWithLeftCapWidth:12

  topCapHeight:0];

[doSomethingButton setBackgroundImage:stretchableButtonImagePressed

forState:UIControlStateHighlighted];

}