问题
I have an app that was created prior to the new iPhone 5 retina widescreen device. Now i am trying to support this high definition widescreen.
I adjust the main ViewController and the main window XIB files so that they are set to Autolayout. I can verify that the width/height displayed via the IB shows 320 x 568.
However, when I run in simulator, i can see that the height is still 480. The code im using to print the height (and width) is in the main view controller's viewWillAppear method:
[UIScreen mainScreen].bounds]
Why is the size.height still 480 instead of 568?
回答1:
You have to add the iPhone 5 Launch image (Default-568h@2x.png) to your project.
The 568 point tall launch image tells iOS to launch your app in 4" mode. If you don't have this image, your app is treated as a 3.5" app. Even if it is 4" compatible.
回答2:
Point worth notice - in new Xcode you have to add this image file Default-568h@2x.png to assets
来源：https://stackoverflow.com/questions/17761967/why-uiscreen-mainscreen-bounds-is-not-returning-full-screen-size