how can I get the scale factor of a UIImageView who's mode is AspectFit?

Question

how can I get the scale factor of a UIImageView who\'s mode is AspectFit?

That is, I have a UIImageView with mode AspectFit. The image (square) is scaled to my UIIm

Answer 1

I've written a UIImageView category for that:

UIImageView+ContentScale.h

#import <Foundation/Foundation.h>

@interface UIImageView (UIImageView_ContentScale)

-(CGFloat)contentScaleFactor;

@end

UIImageView+ContentScale.m

#import "UIImageView+ContentScale.h"

@implementation UIImageView (UIImageView_ContentScale)

-(CGFloat)contentScaleFactor
{
    CGFloat widthScale = self.bounds.size.width / self.image.size.width;
    CGFloat heightScale = self.bounds.size.height / self.image.size.height;

    if (self.contentMode == UIViewContentModeScaleToFill) {
        return (widthScale==heightScale) ? widthScale : NAN;
    }
    if (self.contentMode == UIViewContentModeScaleAspectFit) {
        return MIN(widthScale, heightScale);
    }
    if (self.contentMode == UIViewContentModeScaleAspectFill) {
        return MAX(widthScale, heightScale);
    }
    return 1.0;

}

@end

Answer 2

Well you could do something like

CGFloat widthScale = imageView.image.size.width / imageView.frame.size.width;
CGFloat heightScale = imageView.image.size.height / imageView.frame.size.height;

Let me know if that works for you.