Reworked the Share Extension to use a subclass of MXKRecentsDataSource to show content, solved the room order issue, as well introduced a new class ShareExtensionManager responsible for Sharing content and communicating with the system to terminate the extension with the appropriate exit code when needed.

RiotShareExtension/Model/ShareRecentsDataSource.h

@@ -0,0 +1,21 @@
+//
+//  ShareRecentsDataSource.h
+//  Riot
+//
+//  Created by Aram Sargsyan on 8/10/17.
+//  Copyright © 2017 matrix.org. All rights reserved.
+//
+
+#import <MatrixKit/MatrixKit.h>
+
+typedef NS_ENUM(NSInteger, ShareRecentsDataSourceMode)
+{
+    RecentsDataSourceModePeople,
+    RecentsDataSourceModeRooms
+};
+
+@interface ShareRecentsDataSource : MXKRecentsDataSource
+
+- (instancetype)initWithMatrixSession:(MXSession *)mxSession dataSourceMode:(ShareRecentsDataSourceMode)dataSourceMode;
+
+@end