request DB in watch app from iPhone when showing library after launch the first time and library is empty

SharedSources/VLCWatchMessage.h

@@ -18,6 +18,7 @@ extern NSString *const VLCWatchMessageNamePlayFile;
 extern NSString *const VLCWatchMessageNameSetVolume;
 extern NSString *const VLCWatchMessageNameNotification;
 extern NSString *const VLCWatchMessageNameRequestThumbnail;
+extern NSString *const VLCWatchMessageNameRequestDB;
 
 extern NSString *const VLCWatchMessageKeyURIRepresentation;
 

SharedSources/VLCWatchMessage.m

@@ -16,6 +16,7 @@ NSString *const VLCWatchMessageNamePlayFile = @"playFile";
 NSString *const VLCWatchMessageNameSetVolume = @"setVolume";
 NSString *const VLCWatchMessageNameNotification = @"notification";
 NSString *const VLCWatchMessageNameRequestThumbnail = @"requestThumbnail";
+NSString *const VLCWatchMessageNameRequestDB = @"requestDB";
 
 NSString *const VLCWatchMessageKeyURIRepresentation = @"URIRepresentation";
 

Sources/VLCWatchCommunication.m

@@ -108,6 +108,8 @@ static VLCWatchCommunication *_singeltonInstance = nil;
         [self setVolumeFromWatch:message];
     } else if ([name isEqualToString:VLCWatchMessageNameRequestThumbnail]) {
         [self requestThumnail:message];
+    } else if([name isEqualToString:VLCWatchMessageNameRequestDB]) {
+        [self copyCoreDataToWatch];
     } else {
         APLog(@"Did not handle request from WatchKit Extension: %@",message);
     }

VLC WatchKit Native Extension/Classes/VLCPlaylistInterfaceController.m

@@ -17,6 +17,8 @@
 
 #import "VLCWatchTableController.h"
 #import "MLMediaLibrary+playlist.h"
+#import <WatchConnectivity/WatchConnectivity.h>
+#import "VLCWatchMessage.h"
 
 static NSString *const rowType = @"mediaRow";
 
@@ -67,6 +69,13 @@ static NSString *const rowType = @"mediaRow";
     self.tableController = tableController;
 
     [self updateData];
+
+    if (self.tableController.objects.count == 0) {
+        NSDictionary *dict = [VLCWatchMessage messageDictionaryForName:VLCWatchMessageNameRequestDB];
+        [[WCSession defaultSession] sendMessage:dict
+                                   replyHandler:nil
+                                   errorHandler:nil];
+    }
 }
 
 - (void)table:(WKInterfaceTable *)table didSelectRowAtIndex:(NSInteger)rowIndex {