Question

I am trying to get a nice round corner on a UIImageView. I have found an implemented the following code, which works fine if the image is a square. The problem is that my imageView is a rectangular photo, sometimes portrait sometimes landscape. This code is clipping off the corners, but doesn’t give a smooth curve when one side of the image is longer than the other. Any Ideas? Also is the float in setCornerRadius applied to the image as a percentage of the sides or just straight pixel count?

    // Get the Layer of any view
    CALayer * l = [imageView layer];
    [l setMasksToBounds:YES];
    [l setCornerRadius:100.0];

Here is the fix for all interested.

Okay after some playing with it I figured out I needed to resize the imageView to fit the image. I implemented the following method to set the frame size.

- (CGRect)getScaleForFrameFromImage:(UIImage *)image
{
    // get the bigger side of image to determine the shape then
    // get the percentage we need to scale to to trim imageViewFrame 
    // so it fits image and sits in the space dedicated in main view for the image
    float percentage;
    float newWidth;
    float newHeight;

    float w = image.size.width;
    float h = image.size.height;
    if (w > h) {
        // landscape
        percentage  = 280 / w;
        newWidth = w * percentage;
        newHeight = h * percentage;;
    }
    else {
        percentage  = 208 / h;
        newWidth = w * percentage;
        newHeight = h * percentage;
    }
    int xOrigin = 20 + (280 - newWidth) / 2;
    CGRect newFrame = CGRectMake(xOrigin, 160, newWidth, newHeight);
    return newFrame;
}

then in my viewWillAppear I did this

    // set the imageFrame size
    [imageView setFrame:[self getScaleForFrameFromImage:imageToDisplay]];

    // Use that image to put on the screen in imageView
    [imageView setImage:imageToDisplay];

    // Get the Layer of imageView
    CALayer * l = [imageView layer];
    [l setMasksToBounds:YES];
    [l setCornerRadius:10.0];

Answer 1

What i recommend is to draw the imageView with the size of the image and then apply corner radius.

It would be something like this.

// get the size of the image.
CGSize *size = yourImage.size;

// use the size to set the uiimageview frame
UIImageView * imageView = [UIImageView alloc] initWithFrame:CGRecMake(0,0,size.widht,size.height)];
 [imageView setImage:yourImage];
//
CALayer * l = [imageView layer];
[l setMasksToBounds:YES];
[l setCornerRadius:100.0];