fix background playback

MusicPlayer Watch App/ContentView.swift

@@ -188,7 +188,7 @@ struct ContentView: View {
             print(self.player.error!)
         }
         else {
-            //self.player.play()
+            self.player.play()
         }
     }
     init() {
@@ -202,7 +202,7 @@ struct ContentView: View {
         
         do {
             let session = AVAudioSession.sharedInstance()
-            try session.setCategory(AVAudioSession.Category.playback)
+            try session.setCategory(AVAudioSession.Category.playback, mode: .default, policy: .longFormAudio, options: .duckOthers)
         } catch {
             print(error)
         }

MusicPlayer Watch App/PlaybackView.swift

@@ -69,6 +69,7 @@ struct PlaybackView: View {
                                         parent!.player.pause()
                                         self.playing = false
                                     } else {
+                                        parent!.player.audiovisualBackgroundPlaybackPolicy = .continuesIfPossible
                                         parent!.player.play()
                                         self.playing = true
                                     }

MusicPlayer.xcodeproj/xcuserdata/bill.xcuserdatad/xcdebugger/Breakpoints_v2.xcbkptlist

@@ -36,5 +36,21 @@
             landmarkType = "9">
          </BreakpointContent>
       </BreakpointProxy>
+      <BreakpointProxy
+         BreakpointExtensionID = "Xcode.Breakpoint.FileBreakpoint">
+         <BreakpointContent
+            uuid = "26EC7C75-1CAF-4528-A913-46A2A74EC392"
+            shouldBeEnabled = "Yes"
+            ignoreCount = "0"
+            continueAfterRunningActions = "No"
+            filePath = "MusicPlayer Watch App/ContentView.swift"
+            startingColumnNumber = "9223372036854775807"
+            endingColumnNumber = "9223372036854775807"
+            startingLineNumber = "277"
+            endingLineNumber = "277"
+            landmarkName = "try_download(u:r:e:)"
+            landmarkType = "9">
+         </BreakpointContent>
+      </BreakpointProxy>
    </Breakpoints>
 </Bucket>