iOS Question Stream metadata

Sub GetMetadata(url As String)
   Dim u As NativeObject
   u = u.Initialize("NSURL").RunMethod("URLWithString:", Array(url))
   Dim playerItem As NativeObject
   playerItem = playerItem.Initialize("AVPlayerItem").RunMethod("playerItemWithURL:", Array(u))
   Dim metadataList As List = playerItem.GetField("asset").RunMethod("commonMetadata", Null)
   Log(metadataList)
End Sub