iOS app to show images in full screen on various devices

hi iOS developers

i am creating a simple iOS app to show given images full screen on various iOS devices (iPhone, iPad and iPod Touch) using standard Image Views (UIImageView) of UIKit class. i have prepared 3 sizes in the image assets for each image to be shown, but the funny thing is whatever how i change the class properties and image sizes, the images are always shown in a corner of the screen, not in full screen and not stretched.

see below the screenshots in Xcode.

Image.xcassetsiPad Simulator
anyone could please explain the reason and help me fix this issue?

thanks heaps,
LVL 38
bbaoIT ConsultantAsked:
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bbaoIT ConsultantAuthor Commented:
sorry for replying late. the Auto Layout approach seems to be the right way to go, will check the details a bit later. thanks for your help.
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