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/ViewController/FallbackViewController.m

@@ -0,0 +1,42 @@
+/*
+ Copyright 2017 Aram Sargsyan
+ 
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ 
+ http://www.apache.org/licenses/LICENSE-2.0
+ 
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ */
+
+#import "FallbackViewController.h"
+#import "RiotDesignValues.h"
+
+@interface FallbackViewController ()
+
+@property (weak, nonatomic) IBOutlet UILabel *titleLabel;
+
+@end
+
+@implementation FallbackViewController
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    
+    self.titleLabel.textColor = kRiotTextColorGray;
+    self.titleLabel.text = NSLocalizedStringFromTable(@"auth_share_extension_prompt", @"Vector", nil);
+}
+
+- (void)didReceiveMemoryWarning
+{
+    [super didReceiveMemoryWarning];
+    // Dispose of any resources that can be recreated.
+}
+
+@end