Upvote:2
Aprove answer
　　I've got it.
　　As these three pictures showing below:
The key to the question is, that Xcode must compile project by based SDK 5.1 or later. But the based SDK is not the one in project settings. Like me, I put three versions of iOS SDK into the directory, so there are 3 devices in Run Scheme(as picture3 shows) and its order is the same as the based SDK. I need choose based SDK iOS 5.1 or later in Run Scheme, then it will work well.
Credit Goes to: stackoverflow.com
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