出错日志为：
2013-12-29 01:17:49.785 Displaying Alerts with UIAlertView[419:70b] Cannot find executable for CFBundle 0x8cd3d40 </Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator7.0.sdk/System/Library/AccessibilityBundles/CertUIFramework.axbundle> (not loaded)
解决办法：
还原模拟器
补充说明：在ios7以下的模拟器中没碰到过，最近换到ios7模拟器上，才发现的问题。