Setting Corner Radius on UIImageView not working

Question

I\'m at a bit of a loss. I\'ve used the layer property of UIView to round the corners of multiple elements in my app. However, this one UIImageView is simply not complying.

Answer 1

Swift 4.2 Answer:

In order for the corner radius to work, add the image to a UIView and then you need to set the image's masksToBounds property to true:

planeImage.layer.masksToBounds = true
planeImage.layer.cornerRadius = 20

Note: Replace 20 by the desired cornerRadius

Answer 2

-(void) viewDidAppear:(BOOL)animated{
       [super viewDidAppear:animated];
       [self setMaskTo:viewDistance 
             byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight];
           }

- (void)setMaskTo:(UIView*)view byRoundingCorners:(UIRectCorner)corners
     {
      UIBezierPath *rounded = [UIBezierPath 
                bezierPathWithRoundedRect:view.bounds
                                              byRoundingCorners:corners

                     cornerRadii:CGSizeMake(20.0, 20.0)];

          CAShapeLayer *shape = [[CAShapeLayer alloc] init];
          shape.frame = self.view.bounds;
         [shape setPath:rounded.CGPath];
          view.layer.mask = shape;
       }

Answer 3

Also worth noting that

1. If you are using aspectFit AND cornerRadius with clipsToBounds/masksToBounds, you won't get the rounded corners.

i.e if you have this

theImageView.contentMode = .scaleAspectFit

and

   theImageView.layer.cornerRadius = (theImageView.frame.size.height)/2
    theImageView.clipsToBounds = true

or

theImageView.layer.masksToBounds = true

It won't work. you will have to get rid of aspectFit code

//theImageView.contentMode = .scaleAspectFit

2. Make sure the width and the height for the Image View is same

Answer 4

This should work

cell.previewImage.clipsToBounds = YES;

cell.previewImage.layer.cornerRadius = 20;

Answer 5

Nothing from the previous answers is working?

It may happen that the size of the UIImageView is bigger than the image size. Corner radius can be set well but not visible in that case.

Quick check of the UIImageView size by code: (or can use "View UI Hierarchy" tool in XCode)

self.imageView.backgroundColor = [UIColor greenColor]; 

In this scenario you should assure that UIImageView has the same aspect ratio as the image.

Answer 6

In Xcode Interface Builder, selecting 'Clip Subviews' Drawing attribute for the view together with setting the corner radius in the code cell.previewImage.layer.cornerRadius = 20;does the job for me!

See 'Clip Subviews' option in IB