[Remoting iOS] Adjust position and height of HostCollectionView

remoting/client/ios/app/remoting_view_controller.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "remoting/client/ios/app/remoting_view_controller.h"
 
@@ skipping 88 matching lines @@
     // TODO(nicholss): This is used as a demo of the app functionality for the
     // moment but the real app will force the login flow if unauthenticated.
     [self didSelectSettings];
     // [self didSelectRefresh];
     MDCSnackbarMessage* message = [[MDCSnackbarMessage alloc] init];
     message.text = @"Please login.";
     [MDCSnackbarManager showMessage:message];
   }
 }
 
+- (void)viewDidLayoutSubviews {
+  [super viewDidLayoutSubviews];
+
+  // Adjust the collection view's position and size so that it doesn't get
+  // overlayed by the navigation bar.
+  CGFloat collectionOffsetY =
+      _appBar.headerViewController.headerView.frame.size.height;
+  CGFloat collectionHeight = self.view.bounds.size.height - collectionOffsetY;
+  CGRect oldFrame = _collectionViewController.collectionView.frame;
+  _collectionViewController.collectionView.frame =
+      CGRectMake(oldFrame.origin.x, collectionOffsetY, oldFrame.size.width,
+                 collectionHeight);
+}
+
 #pragma mark - RemotingAuthenticationDelegate
 
 - (void)nowAuthenticated:(BOOL)authenticated {
   if (authenticated) {
     MDCSnackbarMessage* message = [[MDCSnackbarMessage alloc] init];
     message.text = @"Logged In!";
     [MDCSnackbarManager showMessage:message];
     [_remotingService setHostListDelegate:self];
   } else {
     MDCSnackbarMessage* message = [[MDCSnackbarMessage alloc] init];
@@ skipping 123 matching lines @@
   MDCSnackbarMessage* message = [[MDCSnackbarMessage alloc] init];
   if (_isAuthenticated) {
     UserInfo* user = [_remotingService getUser];
     message.text = [NSString
         stringWithFormat:@"Currently signed in as %@.", [user userEmail]];
     [MDCSnackbarManager showMessage:message];
   }
 }
 
 @end