[IOS] iphone开发之［美化按钮］

美化按钮

//添加一个button，美化按钮
    UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeCustom];
    btn1.frame = CGRectMake(40, 300, 100, 30);

    UIImage *buttonImageNormal = [UIImage imageNamed:@"whiteButton.png"];
    UIImage *stretchableButtonImageNormal = [buttonImageNormal stretchableImageWithLeftCapWidth:12 topCapHeight:0];
    //[btn1 setImage:stretchableButtonImageNormal forState:UIControlStateNormal];
    [btn1 setBackgroundImage:stretchableButtonImageNormal forState:UIControlStateNormal];  //set backgroundImage:
    
    UIImage *buttonImagePressed = [UIImage imageNamed:@"blueButton.png"];
    UIImage *stretchableButtonImagePressed = [buttonImagePressed stretchableImageWithLeftCapWidth:12 topCapHeight:0];
    [btn1 setBackgroundImage:stretchableButtonImagePressed forState:UIControlStateHighlighted];
    
    [self.view addSubview:btn1];

解说一下：whiteButton.png    blueButton.png  图片在苹果官方网站提供的DEMO:UICatalog中可以找到。