iOS: Mask a UIImage using UIBezierPath - iphone

Question

I am trying to mask an image so that I can give it only two rounded corners. With the code that I have it just adds the mask in white over the image, but doesn't seem to apply it. What do I need to do different to mask the image corners?
CAShapeLayer *maskLayer = [CAShapeLayer layer];
UIBezierPath *roundedPath = [UIBezierPath bezierPathWithRoundedRect:maskLayer.bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(16.f, 16.f)];
maskLayer.fillColor = [[UIColor whiteColor] CGColor];
maskLayer.backgroundColor = [[UIColor clearColor] CGColor];
maskLayer.path = [roundedPath CGPath];
// Add mask
self.imageView.layer.mask = maskLayer;

Answer 1

Round two corners in UIView
As mentioned in the above linked question, you probably need to remove the view from the heirarchy before applying its mask.
[self.imageView removeFromSuperview];
self.imageView.layer.mask = maskLayer;
[self.view addSubview:self.imageView];
Also, your maskLayer has no bounds. You need to set it to the frame (or bounds) of the view you're trying to mask.
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = self.imageView.frame;