ios - 显示和关闭 AVPlayer 控制器的问题

Question

所以我有一个应用程序可以拍摄和记录要发送到服务器并稍后查看的视频。

事件顺序如下 1. 录制视频 2. 添加过滤器或文本 3. 发送到服务器 4. 关闭 avplayer 并返回摄像头

一切正常，但在第四步，avplayer 永远不会完全解雇，我所看到的就是这个。

这是 avplayer 控制器上所有 UI 组件的图像减去实际视频。

我确保我调用了present 和dismiss，因此不存在我使用错误的视图控制器演示和dismissal 方法组合的问题。当我到达这个屏幕时，我必须再次按下 X 才能回到相机，这不应该是这种情况。

/// Add the story to firebase
func handleAddToStory() {
    print("Attempting to add to story")
    self.dismiss(animated: true, completion: nil)
    // hide the color slider so we can return the image of the tapView that contains the text field if they added one
    colorSlider.isHidden = true
    colorSlider.isHidden = false





    DispatchQueue.global(qos: .background).async {
        print("This is run on the background queue")

        let videoImage = self.imageWithView(inView: self.tapView)


        // Export the video
        self.video?.exportFilterVideo(videoComposition: self.avVideoComposition , completion: { (url) in

            if let videoImage = videoImage {

                let filterVideoAsset = AVAsset(url: url! as URL)

                // Now merge the filtered video with tapView image which will contain the textfield if the user added one
                Merge(config: .standard).overlayVideo(video: filterVideoAsset, overlayImage: videoImage, completion: { (finalVideoUrl) in

                    // Upload to firebase storage
                    let dateFormatter = ISO8601DateFormatter()
                    let timeStamp = dateFormatter.string(from: Date())
                    let uid = User.current.uid
                    let storageRef = Storage.storage().reference().child("event_stories").child(self.eventKey).child(uid).child(timeStamp + ".mp4")
                    StorageService.uploadVideo(finalVideoUrl! as URL, at: storageRef) { (downloadUrl) in
                        guard let downloadUrl = downloadUrl else {
                            return
                        }

                        let videoUrlString = downloadUrl.absoluteString
                        print(videoUrlString)
                        // Post to firebase
                        PostService.create(for: self.eventKey, for: videoUrlString)
                    }

                }, progressHandler: { _ in })


            } else {

                let dateFormatter = ISO8601DateFormatter()
                let timeStamp = dateFormatter.string(from: Date())
                let uid = User.current.uid
                let storageRef = Storage.storage().reference().child("event_stories").child(self.eventKey).child(uid).child(timeStamp + ".mp4")
                StorageService.uploadVideo(url! as URL, at: storageRef) { (downloadUrl) in
                    guard let downloadUrl = downloadUrl else {
                        return
                    }

                    let videoUrlString = downloadUrl.absoluteString
                    print(videoUrlString)
                    PostService.create(for: self.eventKey, for: videoUrlString)
                }
                //svprogresshud insert here

            }

        })







        DispatchQueue.main.async {
            print("This is run on the main queue, after the previous code in outer block")
            self.dismiss(animated: true, completion: nil)
            self.videoPlayer?.replaceCurrentItem(with: nil)

        }
    }


}

这是处理添加到服务器的函数。有一些异步任务正在进行，但不应该篡改控制器的解雇，这可以在底部看到。有谁知道为什么视图控制器仍然存在？

下面是呈现上述视图控制器的代码片段。

  if let event = self.event {
                        let video = AVURLAsset(url: videoURL)
                        let videoViewController = FilterVideoViewController(video: video)
                        videoViewController.event = event
                        SVProgressHUD.dismiss(completion: {
                            self.present(videoViewController, animated: false, completion: nil)
                        })

                    }

标签： iosswiftavfoundation

Answer 1

These parts

video?.exportFilterVideo(videoComposition: avVideoComposition , completion: { (url) in 
   Merge(config: .standard).overlayVideo(video: filterVideoAsset, overlayImage: videoImage, completion: { (finalVideoUrl) in

are making the main thread very busy . so you need a background queue like

 func handleAddToStory() {
    print("Attempting to add to story")

    // hide the color slider so we can return the image of the tapView that contains the text field if they added one
    colorSlider.isHidden = true
    let videoImage = self.imageWithView(inView: self.tapView)
    colorSlider.isHidden = false
    self.dismiss(animated:false, completion: nil)
    self.videoPlayer?.replaceCurrentItem(with: nil)


    DispatchQueue.main.asyncAfter(deadline: .now() + 0.7 ) {

            video?.exportFilterVideo(videoComposition: avVideoComposition , completion: { (url) in

                if let videoImage = videoImage {

                    let filterVideoAsset = AVAsset(url: url! as URL)

                    // Now merge the filtered video with tapView image which will contain the textfield if the user added one
                    Merge(config: .standard).overlayVideo(video: filterVideoAsset, overlayImage: videoImage, completion: { (finalVideoUrl) in

                        upload(finalVideoUrl! as URL)  

                    }, progressHandler: { _ in })


                } else {

                   upload(url! as URL)

                }

            })

    }


}

func upload(_ url:URL) {

 DispatchQueue.global().async {

    let dateFormatter = ISO8601DateFormatter()
    let timeStamp = dateFormatter.string(from: Date())
    let uid = User.current.uid
    let storageRef = Storage.storage().reference().child("event_stories").child(self.eventKey).child(uid).child(timeStamp + ".mp4")
    StorageService.uploadVideo(url, at: storageRef) { (downloadUrl) in
        guard let downloadUrl = downloadUrl else {
            return
        }

        let videoUrlString = downloadUrl.absoluteString
        print(videoUrlString)
        PostService.create(for: self.eventKey, for: videoUrlString)
    }

 }

}