Fix build error on macOS

darwin/Classes/Music.swift

@@ -184,6 +184,10 @@ public class Player : NSObject, AVAudioPlayerDelegate {
     }
     #endif
 
+    func invokeListenerStop(){
+        self.channel.invokeMethod(Music.METHOD_CURRENT, arguments: nil)
+    }
+
     #if os(iOS)
     var targets: [String:Any] = [:]
 
@@ -214,10 +218,6 @@ public class Player : NSObject, AVAudioPlayerDelegate {
         self.channel.invokeMethod(Music.METHOD_PLAY_OR_PAUSE, arguments: [])
     }
 
-    func invokeListenerStop(){
-        self.channel.invokeMethod(Music.METHOD_CURRENT, arguments: nil)
-    }
-
     func setupMediaPlayerNotificationView(notificationSettings: NotificationSettings, audioMetas: AudioMetas, isPlaying: Bool) {
         self.notificationSettings = notificationSettings
         self.audioMetas = audioMetas