Autolayout for Height working in iOS8 but not working in iOS7

问题

I have my UIImageView in the view which will download image from server and after downloading finish then my UIImageView height will be adjusted according to height of image but the problem is it is working perfectly in iOS8 but not in iOS7. In iOS7, the height is scaled to much more than I tried to set. I am setting autolayout via IB

Here is the excerpt from my code (default is 250)

 if(image.size.height<250) headerView.itemImageView.contentMode =      UIViewContentModeCenter;
                 else{


                   adjustedHeight =      image.size.height*320.0f/image.size.width;


                     imageHeight = adjustedHeight;

                     [headerView.heightContraintLayout setConstant:adjustedHeight];
                [headerView.itemImageView layoutIfNeeded];
 //after this line of code, I check the size of itemImageView is extended more than the adjestedHeight that I set in the previous line ( this only happened in iOS7 not iOS8

回答1:

You set the image view's content mode to "centre".

Try setting it to "Aspect Fill" or "Scale to Fill" according to what you need to achieve.

来源：https://stackoverflow.com/questions/31889762/autolayout-for-height-working-in-ios8-but-not-working-in-ios7