To make a rounded UIView, specify a cornerRadius for the view’s layer.

This also applies any class which inherits from UIView, such as UIImageView.

Programmatically

Swift Code

someImageView.layoutIfNeeded()
someImageView.clipsToBounds = true
someImageView.layer.cornerRadius = 10

Objective-C Code

[someImageView layoutIfNeeded];
someImageView.clipsToBounds = YES;
someImageView.layer.cornerRadius = 10;

Example

//Swift code
topImageView.layoutIfNeeded()
bottomImageView.layoutIfNeeded()
topImageView.clipsToBounds = true
topImageView.layer.cornerRadius = 10
bottomImageView.clipsToBounds = true
bottomImageView.layer.cornerRadius = bottomImageView.frame.width / 2

//Objective-C code
[topImageView layoutIfNeeded]
[bottomImageView layoutIfNeeded];
topImageView.clipsToBounds = YES;
topImageView.layer.cornerRadius = 10;
bottomImageView.clipsToBounds = YES;
bottomImageView.cornerRadius = CGRectGetWidth(bottomImageView.frame) / 2;

Here is the result, showing the rounded view effect using the specified corner radius:

Example

Note

To do this you need to include the QuartzCore framework.

#import <QuartzCore/QuartzCore.h>

Storyboard Configuration

A rounded view effect can also be achieved non-programmatically by setting the corresponding properties in Storyboard.

Since layer properties aren’t exposed in Storyboard, you have to modify the cornerRadius attribute via the User Defined Runtime Attributes section.