调用 URLSession 后我不能做其他工作

Question

I just want to hide imageview when the audio starts playing

URLSession.shared.dataTask(with: serverUrl!) { [self] (data, res, error) in
            do {
                self.myMediaPlayer1 = try AVAudioPlayer(data: data!)
                self.myMediaPlayer1.prepareToPlay()
                self.myMediaPlayer1.delegate = self
                self.SetSessionPlayerOn()
                self.loading_img.isHidden = true    // not work til audio finish playing 
                print("imageview should be hidden now")
                self.myMediaPlayer1.play()
            }catch let error {
                print("error!!!!!!!!!!")
            }
        }.resume()

I can print atone but the image view will be hidden only when the media player has finished playing !

UPDATE now it works. thanks Tushar

DispatchQueue.main.async { [unowned self] in
                    self.loading_img.isHidden = true
                }

Answer 1

First, you should update the UI only on the main thread. So you have to add the below code inside dataTask. After that, you should update the layout of the view to update the UI. So the code should be like this:

URLSession.shared.dataTask(with: serverUrl!) { [self] (data, res, error) in
        do {
            self.myMediaPlayer1 = try AVAudioPlayer(data: data!)
            self.myMediaPlayer1.prepareToPlay()
            self.myMediaPlayer1.delegate = self
            self.SetSessionPlayerOn()
            DispatchQueue.main.async {
                self.loading_img.isHidden = true
                self.view.layoutIfNeeded()
                print("imageview should be hidden now")
            }
            self.myMediaPlayer1.play()
        }catch let error {
            print("error!!!!!!!!!!")
        }
    }.resume()