i trying create app allows users select pictures photo library on iphone , make uiimage view more responsive either portrait or landscape view of screen.
in view controller, have uiimage: uiimage in viewcontroller
then set 4 constraints on 
however, when select image photo library, size of picture not responsive portrait or landscape. size of picture seems smaller width (380) & height (419) of uiimage. 
the relevant code uiimagepickercontroller is:
self.pickedimage.image = image self.pickedimage.contentmode = .scaleaspectfit so wondering how make size of picture responsive screen (landscape/portrait). thanks
it doing ordered to: top spacing of 16 pixels navigation bar , bottom spacing of 99 pixels toolbar. uiimageview wider image (you can check changing background color). if make margins smaller, see image increase in size.
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