Mask a UIView with a cut-out circle

Question

I’ve created a UIView with a semi-transparent black background to sit across my main app’s view. What I’m aiming for here is to create a cut-out circle shape so

Answer 1

If You are using any Black Image to mask then

-(void)maskWithImage:(UIImage*)maskImage toImageView:(UIImageView*)imgView{

    CALayer *aMaskLayer=[CALayer layer];
    aMaskLayer.contents=(id)maskImage.CGImage;

    imgView.layer.mask=aMaskLayer;


}

If you have any Custom ShapeLayer to mask

-(void)maskWithShapeLayer:(CALayer*)layer toImageView:(UIImageView*)imgView{
    //Layer should be filled with Black color to mask those part of Image
    imgView.layer.mask=layer;
}

If You want to make ImageView Mask with Circle

-(void)maskWithCircle:(UIImageView*)imgView{

    CAShapeLayer *aCircle=[CAShapeLayer layer];
    aCircle.path=[UIBezierPath bezierPathWithRoundedRect:imgView.bounds cornerRadius:imgView.frame.size.height/2].CGPath; // Considering the ImageView is square in Shape

    aCircle.fillColor=[UIColor blackColor].CGColor;
    imgView.layer.mask=aCircle;

}