2016-03-18 30 views
1

我在xcode中創建了四個ViewController,每按一個播放按鈕時它們都會播放不同的音頻混合。如果我導航到另一個視圖控制器並按下該播放按鈕...如何停止播放其他所有音頻,並確保新的音頻混合播放成功?如何停止從另一個ViewController播放音頻?

下面詳細介紹的代碼存在於四個ViewController中。唯一的區別是我創建了三個新的musicPlayer實例。他們是musicPlayerSummer,musicPlayerWinter,musicPlayerAutumn。我爲每個viewcontroller創建了新的按鈕。

任何建議,將不勝感激。

謝謝

進口的UIKit 進口AVFoundation

類ViewControllerSpring:UIViewController的{

var musicPlayer: AVAudioPlayer! 
var mySongs = ["1", "2", "3", "4"] 



override func viewDidLoad() { 
    super.viewDidLoad() 


    initAudio() 


    // Do any additional setup after loading the view. 

}

func initAudio() { 



    let path = NSBundle.mainBundle().pathForResource(mySongs[0], ofType: "mp3")! 

    do { 

     musicPlayer = try AVAudioPlayer(contentsOfURL: NSURL(string: path)!) 
     musicPlayer.prepareToPlay() 
     musicPlayer.numberOfLoops = -1 



    } catch let err as NSError { 
     print(err.debugDescription) 


    } 




    let session:AVAudioSession = AVAudioSession.sharedInstance() 

    do { 
     try session.setCategory(AVAudioSessionCategoryPlayback) 
    } catch { 
     //catching the error. 
    } 

}

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 
    // Dispose of any resources that can be recreated. 
} 


/* 
// MARK: - Navigation 

// In a storyboard-based application, you will often want to do a little preparation before navigation 
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
// Get the new view controller using segue.destinationViewController. 
// Pass the selected object to the new view controller. 
} 
*/ 

override func prefersStatusBarHidden() -> Bool { 
    return true 
} 






@IBAction func springPlayPressed(sender: UIButton) { 

    if musicPlayer.playing { 

     musicPlayer.stop() 


     // for normal state 
     sender.setImage(UIImage(named: "play.png"), forState: UIControlState.Normal) 


    } else { 

     musicPlayer.play() 





     // for Highlighted state 
     sender.setImage(UIImage(named: "Pause.png"), forState: UIControlState.Normal) 
    } 
} 

}

+2

有幾個方法。一種方法是委派,其他方式是PostNotification。如果只有一個玩家,那麼應該使用授權,如果更多的玩家停止,那麼應該使用Notification Observer。 – iMuzahid

+0

同意,最佳做法與上述一致。但是,如果你想採取捷徑......(通常被認爲是不好的做法)......讓你的球員變得更加全球化,或者更好地使他們成爲單身。 – MikeG

+0

爲什麼讓球員全球化是不好的做法? – hoboman

回答

0

您可以使用通知。

發送通知時,音頻處理:

[[NSNotificationCenter defaultCenter] postNotificationName:@"MyAudioTerminatedNotification" object:self]; 

它接收到你的其他觀點:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioTerminatedNotification:) name:@"MyAudioTerminatedNotification" object:nil]; 

你的行動:

- (void)audioTerminatedNotification:(NSNotification *)notification { 
    // Do you action 
} 

而且它的配置:

[[NSNotificationCenter defaultCenter] removeObserver:self]; 
0

爲了解決這個問題聲明audioPlayer中的appDelegate

// inside AppDelegate 
var audioPlayer : AVAudioPlayer? = nil 

然後只需在您的viewController聲明:

var audioPlayer : AVAudioPlayer? { 
    get { 
     let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
     return appDelegate.audioPlayer 
    } 
    set { 
     let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate 
     appDelegate.audioPlayer = newValue 
    } 
}