我在xcode中创建了四个ViewController,每按一个播放按钮时它们都会播放不同的音频混合。如果我导航到另一个视图控制器并按下该播放按钮...如何停止播放其他所有音频,并确保新的音频混合播放成功?如何停止从另一个ViewController播放音频?
下面详细介绍的代码存在于四个ViewController中。唯一的区别是我创建了三个新的musicPlayer实例。他们是musicPlayerSummer,musicPlayerWinter,musicPlayerAutumn。我为每个viewcontroller创建了新的按钮。
任何建议,将不胜感激。
谢谢
进口的UIKit 进口AVFoundation
类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)
}
}
}
有几个方法。一种方法是委派,其他方式是PostNotification。如果只有一个玩家,那么应该使用授权,如果更多的玩家停止,那么应该使用Notification Observer。 – iMuzahid
同意,最佳做法与上述一致。但是,如果你想采取捷径......(通常被认为是不好的做法)......让你的球员变得更加全球化,或者更好地使他们成为单身。 – MikeG
为什么让球员全球化是不好的做法? – hoboman