改变button上图片的颜色

UIImage *buttonImage = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:str]]];
        _button.tintColor = UIColorFromRGB(0x52b0da);//设置新的颜色
        //取消图片原来的颜色
        [_button setImage:[buttonImage imageWithRenderingMode:(UIImageRenderingModeAlwaysTemplate)] forState:(UIControlStateNormal)];


UIButton *button = [UIButton alloc] initWithFrame:CGRect(100, 100, 100 , 100)];
    //设置边框颜色
    button.layer.borderColor = [[UIColor redColor] CGColor];
   //设置边框宽度
    button.layer.borderWidth = 1.0f;
    //给按钮设置角的弧度
    button.layer.cornerRadius = 4.0f;
   //设置背景颜色
    button.backgroundColor = [UIColor redColor];
    button.layer.masksToBounds = YES;