I am working in XCode Version 4.5. For each Xib I can select the size as either “Retina 3.5 fullscreen” or “Retina 4 fullscreen”.
My doubt is: will my app work properly on an older iPhone (with screen with 3.5) if I select Retina 4 Fullscreen and vice-versa?
The best way is to Create separate Xib files for Both 3.5″ and 4″ screen and load them as per device version.Also You can SET
autoresizingMaskSee the following code :UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleBottomMargin | UIViewAutoresizingFlexibleRightMargin