录音过短时没有readyStopRecord

[Beyond-Chao]

录音过短时没有stop recorder, 录音一直在录制，当超过60s时会回调stopRecord
if self.audioTimeInterval.int32Value > 60 { self.stopRecord() }
导致还会录音成功。

虽然在stopRecord里面调用了 self.operationQueue.cancelAllOperations() 如果录音时长小于0.5s时，但是子线程的while循环一直在跑，因为recorder.isRecording 是true
cancelAllOperations() 的文档是这样描述：
For operations that are already executing, the operation object itself must check for cancellation and stop what it is doing so that it can move to the finished state.

[hilen]

后续我会统一跟踪下类似的问题

[Beyond-Chao]

期待

[Beyond-Chao]

还有个优化点：请求权限的方法 open func requestRecordPermission(_ response: @escaping AVFoundation.PermissionBlock) 这个block可能在异步线程调用， Note that the block may be called in a different thread context. 所以UI操作最好用dispatch_async_safely_to_main_queue() 包一下。