ios image设置颜色

ios代码改变图片的颜色

       UIImage *image = [UIImage imageNamed:@"qr-code"];
        self.ImageView.image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
    [image setTintColor:[UIColor whiteColor]];

iOS背景透明

self.view.backgroundColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.02];

hex

rgb