[CFXPreferencesSearchListSource tryLock]:Its a bug of simulator 5. After UIAlertView dismissed, pr
[CFXPreferencesSearchListSource tryLock]:
It's a bug of simulator 5. After UIAlertView dismissed, press CMD+SHIFT+H, the bug occurs.
In fact, it doesn't occur in physical devices. So don't panic
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原文：http://stackoverflow.com/questions/12924146/cfxpreferencessearchlistsource-trylock