将圆形裁剪应用于 UIImage 或 UIImageView

Question

How can I programmatically apply a circular crop out to a UIImage or a UIImageView ? Is it possible, or must I use a graphical mask?

Till now I am using a graphical mask (a png image) but the final crop out result is ovalized, rather than a perfect circle.

[imageView setContentMode: UIViewContentModeScaleAspectFit];

[imageView setContentMode: UIViewContentModeScaleAspectFill];

also do not solve the problem.

Please note that the UIImageView that the image is applied to is already defined exactly as a square in IB.

Answer 1

If the UIImageView is already a square then you can set the corner radius of its layer to half of its width/height

[imageView.layer setCornerRadius:imageView.frame.size.width / 2.0]; 
[imageView.layer setMasksToBounds:YES];