I've been testing my app in the 4-inch and 3.5-inch iPhone simulators, and when bringing up a keyboard with a UITextField in the 4-inch simulator in landscape mode, it's squished up to the side. It looks like a normal 3.5-inch keyboard:
Am I missing something telling it to stretch properly?
Please note - I don't have access to an actual iPhone 5 device to test on. Any help would be appreciated.
Maybe your simulator is set to the 4-inch model but is running iOS5--this setup is possible in iOS Simulator but doesn't exist in the wild.
来源：https://stackoverflow.com/questions/12797419/iphone-5-keyboard-sizing