当我的应用进入后台时(在applicationDidEnterBackground之后)，出现以下警告。2015-12-1120:54:43.661AppName[759:124891]*|synchronize-skip|*afencewasstartedinsideofasnapshotblock-skippingtheworkspacesynchronizebecauseitmaydequeuemessagesfromthefenceExemptQueueandsnapshotsexpectthatnottohappen2015-12-1120:54:44.084AppName[

当我的应用进入后台时(在applicationDidEnterBackground之后)，出现以下警告。2015-12-1120:54:43.661AppName[759:124891]*|synchronize-skip|*afencewasstartedinsideofasnapshotblock-skippingtheworkspacesynchronizebecauseitmaydequeuemessagesfromthefenceExemptQueueandsnapshotsexpectthatnottohappen2015-12-1120:54:44.084AppName[