How to get the displayed image frame from UIImageView?

iphone uiimageview
AechoLiu picture AechoLiu · Jan 17, 2011 · Viewed 16.2k times · Source

I modify the UIImageView's contentMode property. So my image's frame is not equal to the frame of UIImageView. My problem is how to retrive the image's frame from UIImageView.

As the following example, the orange rectangle is the UIImageView's border. It is obviously that the frame of image is not the same as UIImageView.

Figure 1

Answer

Costique picture Costique · Jan 17, 2011

If it's UIViewContentModeScaleAspectFit, it's something like this:

UIImageView *iv; // your image view
CGSize imageSize = iv.image.size;
CGFloat imageScale = fminf(CGRectGetWidth(iv.bounds)/imageSize.width, CGRectGetHeight(iv.bounds)/imageSize.height);
CGSize scaledImageSize = CGSizeMake(imageSize.width*imageScale, imageSize.height*imageScale);
CGRect imageFrame = CGRectMake(roundf(0.5f*(CGRectGetWidth(iv.bounds)-scaledImageSize.width)), roundf(0.5f*(CGRectGetHeight(iv.bounds)-scaledImageSize.height)), roundf(scaledImageSize.width), roundf(scaledImageSize.height));

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