在ViewDidLoad中设置按钮图案

- (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];

}