invalid mode 'kCFRunLoopCommonModes' provided to CFRunLoopRunSpecific - break on _CFRunLoopError_RunCalledWithInvalidMode to debug. This message will only appear once per execution.
【iOS|iOS -- crash】参考网址：http://www.jianshu.com/p/75bf712b3c74
参考网址：http://inessential.com/hownottocrash
