macos - itunes 是否会触发操作系统上其他进程可以监听的事件？

Question

我正在考虑创建一个应用程序，该应用程序需要了解 iTunes 中正在播放的歌曲。

如果 itunes 不触发事件，是否有数据库或某种方法可以以编程方式获取 itunes 中正在播放的内容？

Answer 1

iTunes 确实会发出分布式通知。您可以通过观察com.apple.iTunes.playerInfo

来获取完整的轨道状态

NSDistributedNotificationCenter.defaultCenter().addObserver(self, selector: "iTunesNotification:", name: "com.apple.iTunes.playerInfo", object: nil)
func iTunesNotification (notification:NSNotification!) {
    var trackInfo:NSDictionary! = notification.userInfo
    println("Track Info \(trackInfo)")
}

轨道的示例输出是:

Track Info {
    Album = "The Very Best Of Sting & The Police";
    "Album Artist" = "Sting & The Police";
    "Album Rating" = 0;
    "Album Rating Computed" = 1;
    Artist = "Sting & The Police";
    "Artwork Count" = 1;
    Composer = Sting;
    Genre = Rock;
    "Library PersistentID" = 3465537150503037139;
    Location = "file://localhost/Users/GoodSpeed/Music/iTunes/iTunes%20Media/Music/Sting%20&%20The%20Police/The%20Very%20Best%20Of%20Sting%20&%20The%20Police/17%20Roxanne.mp3";
    Name = Roxanne;
    PersistentID = 716102833338382931;
    "Play Count" = 1;
    "Play Date" = "2013-12-28 10:43:24 +0000";
    "Player State" = Playing;
    "Playlist PersistentID" = 5080879747404822807;
    "Rating Computed" = 1;
    "Skip Count" = 0;
    "Store URL" = "itms://itunes.com/link?n=Roxanne&an=Sting%20%26%20The%20Police&pn=The%20Very%20Best%20Of%20Sting%20%26%20The%20Police&cn=Sting";
    "Total Time" = 190458;
    "Track Number" = 17;
    Year = 2002;
}