[英]play next song when music when music is finished in iOS swift
我試圖建立一個音樂應用程序。 音樂播放得很好,但是音樂播放完后就不會播放下一首歌。 我正在尋找這個解決方案。 當我嘗試一些解決方案是給我錯誤。
由於未捕獲的異常'NSInvalidArgumentException'而終止應用程序,原因:'-[Shironamhin.MusicPlayer playerDidFinishPlaying:]:無法識別的選擇器已發送到實例0x17003d960
我正在嘗試這種方式
class MusicPlayer: NSObject {
static let player = MusicPlayer()
//this is global variable
var player : AVPlayer?
var playerItem:AVPlayerItem?
func initPlayer(){
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
try AVAudioSession.sharedInstance().overrideOutputAudioPort(AVAudioSessionPortOverride.speaker)
print("AVAudioSession Category Playback OK")
do {
try AVAudioSession.sharedInstance().setActive(true)
print("AVAudioSession is Active")
} catch let error as NSError {
print(error.localizedDescription)
}
} catch let error as NSError {
print(error.localizedDescription)
}
}
func playMusic(_ musicUrl: String?) {
if let mm = musicUrl {
var url: URL!
url = URL(string: mm)
playerItem = AVPlayerItem(url: url)
player = AVPlayer(playerItem: playerItem)
player?.volume = 1.0
player?.rate = 1.0
player?.play()
NotificationCenter.default.addObserver(self, selector: Selector(("playerDidFinishPlaying:")), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: playerItem)
}
func playerDidFinishPlaying(note: NSNotification) {
print("call")
}
}
}
另外,我如何實現這個playerDidFinishPlaying?
從Swift 3開始,您必須這樣聲明Selectors
: #selector(playerDidFinishPlaying(email:))
,從Swift 4開始,您必須將@objc
屬性添加到函數中:
@objc func audioDidFinishPlaying(note: NSNotification) {
print("call")
}
順便說一句, AVAudioPlayerDelegate
有一個不錯的功能: optional func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool)
,使用起來可能會更容易。 :)
我同意@ user6603599,這就是我使用的。
func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
print("\naudioPlayerDidFinishPlaying")
}
確保為您的MusicPlayer類設置如下:
class MusicPlayer:AVAudioPlayerDelegate {
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