我想显示当前由iOS系统播放器播放的歌曲的歌词。
这是我的自定义播放器:
import UIKit
import MediaPlayer
import AVFoundation
class NowPlayingController: NSObject {
var musicPlayer: MPMusicPlayerController {
if musicPlayer_Lazy == nil {
musicPlayer_Lazy = MPMusicPlayerController.systemMusicPlayer()
let center = NotificationCenter.default
center.addObserver(self,
selector: #selector(self.playingItemDidChange),
name: NSNotification.Name.MPMusicPlayerControllerNowPlayingItemDidChange,
object: musicPlayer_Lazy)
musicPlayer_Lazy!.beginGeneratingPlaybackNotifications()
}
return musicPlayer_Lazy!
}
private var musicPlayer_Lazy: MPMusicPlayerController?
var nowPlaying: MPMediaItem?
//If song changes
func playingItemDidChange(notification: NSNotification) {
nowPlaying = musicPlayer.nowPlayingItem
}
}
为了从
nowPlaying
项获取歌词,我尝试了2种方法,并且两种方法总是返回nil
。这段代码总是返回nil:
let lyricsText = nowPlaying?.value(forProperty: MPMediaItemPropertyLyrics) as? NSString as String?
在以下代码中,
MPMediaItemPropertyAssetURL
始终返回nil
而不是实际URL:let songUrl = nowPlaying?.value(forProperty: MPMediaItemPropertyAssetURL) as? NSURL as URL?
if songUrl != nil {
let songAsset = AVURLAsset(url: songUrl!, options: nil)
lyricsText = songAsset.lyrics
我正在真实设备上进行测试:iPhone 6s/iOS 10.3
关于如何获取歌词或MPMediaItemPropertyAssetURL为什么返回nil的任何建议?
最佳答案
我不知道为什么它不起作用,但是看起来现在相同的代码可以正常工作。也许它以某种方式连接到我现在用于播放器实例的单例。这是100%工作的Swift 3版本:
import UIKit
import MediaPlayer
import AVFoundation
class NowPlayingController: NSObject {
static let sharedController = NowPlayingController()
//MARK: Init
private override init () {
super.init()
var musicPlayer_Lazy: MPMusicPlayerController?
// System player instance
if musicPlayer_Lazy == nil {
musicPlayer_Lazy = MPMusicPlayerController.systemMusicPlayer()
NotificationCenter.default.addObserver(self,
selector: #selector(self.playingItemDidChange),
name: NSNotification.Name.MPMusicPlayerControllerNowPlayingItemDidChange,
object: musicPlayer_Lazy)
musicPlayer_Lazy!.beginGeneratingPlaybackNotifications()
}
self.musicPlayer = musicPlayer_Lazy!
}
// MARK: Class properties
var musicPlayer: MPMusicPlayerController!
var nowPlaying: MPMediaItem?
// MARK: Methods
func playingItemDidChange(notification: NSNotification) {
nowPlaying = musicPlayer.nowPlayingItem
NotificationCenter.default.post(newSongNotification as Notification)
}
func getLyrics() {
let songUrl = nowPlaying?.value(forProperty: MPMediaItemPropertyAssetURL) as? URL
let songAsset = AVURLAsset(url: songUrl!, options: nil)
let lyricsText = songAsset.lyrics
}
}
关于ios - 如何在iOS10中获取Now Now歌曲的歌词(Swift 3),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/43222995/