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Swift 3.0 unresolved identifier for DispatchQueue2个
我试图在主线程上异步拍摄/录制视频.但是,当我调用dispatch.main.async时,我总是收到错误：
我试图在主线程上异步拍摄/录制视频.但是,当我调用dispatch.main.async时,我总是收到错误：
use of unresolved identifier DispatchQueue
从WWDC到Apple的文档我到处都是,但我看不到这种类型被弃用的证据.
这是代码：
if !self.cameraEngine.isRecording {
if let url = CameraEngineFileManager.temporaryPath("video.mp4") {
self.cameraButton.setTitle("stop recording",forState: [])
self.cameraEngine.startRecordingVideo(url,blockCompletion: { (url: NSURL?,error: NSError?) -> (Void) in
if let url = url {
DispatchQueue.main.async {
self.cameraButton.setTitle("start recording",for: .normal)
CameraEngineFileManager.saveVideo(url,blockCompletion: { (success: Bool,error: Error?) -> (Void) in
if success {
let alertController = UIAlertController(title: "Success,video saved !",message: nil,preferredStyle: .alert)
alertController.addAction(UIAlertAction(title: "Ok",style: .default,handler: nil))
self.present(alertController,animated: true,completion: nil)
}
})
}
}
})
}
}
else {
self.cameraEngine.stopRecordingVideo()
}
}
