How to develop or migrate apps for iPhone 5 screen resolution?

Question

The new iPhone 5 display has a new aspect ratio and a new resolution (640 x 1136 pixels).

What is required to develop new or transition already existing applications

Answer 1

Checking bounds with 568 will fail in landscape mode. iPhone 5 launches only in portrait mode but if you want to support rotations then the iPhone 5 "check" will need to handle this scenario as well.

Here's a macro which handles orientation state:

#define IS_IPHONE_5 (CGSizeEqualToSize([[UIScreen mainScreen] preferredMode].size, CGSizeMake(640, 1136)))

The use of the 'preferredMode' call is from another posting I read a few hours ago so I did not come up with this idea.