UIImage size in UIImageView

Question

I have some UIImage and display it in UIImageView.

I need to use UIViewContentModeScaleAspectFit content mode.

Here i

Answer 1

Here's a category on UIImageView that you can use to introspect the bounds of the displayed image based on the UIViewContentMode set on the image view:

@implementation UIImageView (JRAdditions)

- (CGRect)displayedImageBounds {
    UIImage *image = [self image];
    if(self.contentMode != UIViewContentModeScaleAspectFit || !image)
        return CGRectInfinite;

    CGFloat boundsWidth  = [self bounds].size.width,
            boundsHeight = [self bounds].size.height;

    CGSize  imageSize  = [image size];
    CGFloat imageRatio = imageSize.width / imageSize.height;
    CGFloat viewRatio  = boundsWidth / boundsHeight;

    if(imageRatio < viewRatio) {
        CGFloat scale = boundsHeight / imageSize.height;
        CGFloat width = scale * imageSize.width;
        CGFloat topLeftX = (boundsWidth - width) * 0.5;
        return CGRectMake(topLeftX, 0, width, boundsHeight);
    }

    CGFloat scale = boundsWidth / imageSize.width;
    CGFloat height = scale * imageSize.height;
    CGFloat topLeftY = (boundsHeight - height) * 0.5;

    return CGRectMake(0, topLeftY, boundsWidth, height);
}

@end