How to set corner radius of imageView?

Question

In Objective-C such line

self.mainImageView.layer.cornerRadius = CGRectGetWidth(self.mainImageView.frame)/4.0f;

does its job, I tried it in

Answer 1

Layer draws out of clip region, you need to set it to mask to bounds:

self.mainImageView.layer.masksToBounds = true

From the docs:

By default, the corner radius does not apply to the image in the layer’s contents property; it applies only to the background color and border of the layer. However, setting the masksToBounds property to true causes the content to be clipped to the rounded corners