Masking Image with a transparent PNG

Hi i have made a function in which you can pass 2 UIImages and it will mask with the transparent Image
like

- (UIImageView*) maskImage:(UIImage *)image withMask:(UIImage *)maskImage {

    UIImageView *imageView = [[UIImageView alloc] initWithImage:image];

    CALayer *mask1 = [CALayer layer];

    mask1.contents = (id)[maskImage CGImage];

    mask1.frame = CGRectMake(0, 0, 1024, 768);

    imageView.layer.mask = mask1;

    imageView.layer.masksToBounds = YES;

    return imageView;

}

Its returns the UIImageView, which you can add directly in UIView. You can call this method like following:

    UIImage *image = [UIImage imageNamed:@"screenFull.png"];

    UIImage *mask = [UIImage imageNamed:@"screen_mask.png"];

    [self.completeSingleView addSubview:[self maskImage:image withMask:mask]];

Here completeSingleView is a UIView.


Reference is taken from 
http://stackoverflow.com/questions/5757386/how-to-mask-an-uiimageview