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];}

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