UIImageView+actualImageSize

UIImageView+actualImageSize.h

@interface UIImageView (actualImageSize)

- (CGSize)actualImageSize;

@end

UIImageView+actualImageSize.m

#import "UIImageView+actualImageSize.h"

@implementation UIImageView (actualImageSize)

- (CGSize)actualImageSize
{
    CGSize actualImageSize;
    
    CGFloat sx = self.frame.size.width / self.image.size.width;
    CGFloat sy = self.frame.size.height / self.image.size.height;
    CGFloat s = 1.0;
    
    switch (self.contentMode) {
        case UIViewContentModeScaleAspectFit:
            s = fminf(sx, sy);
            actualImageSize = CGSizeMake(self.image.size.width * s, self.image.size.height * s);
            break;
        case UIViewContentModeScaleAspectFill:
            s = fmaxf(sx, sy);
            actualImageSize = CGSizeMake(self.image.size.width * s, self.image.size.height * s);
            break;
        case UIViewContentModeScaleToFill:
            actualImageSize = CGSizeMake(self.image.size.width * sx, self.image.size.height * sy);
            break;
        default:
            actualImageSize = CGSizeMake(self.image.size.width * s, self.image.size.height * s);
            break;
    }
    
    return actualImageSize;
}

@end