resize view when keyboard appears

PanoPainter/GameViewController.m

@@ -43,6 +43,42 @@ int t_count = 0;
     return YES;
 }
 
+// Call this method somewhere in your view controller setup code.
+- (void)registerForKeyboardNotifications
+{
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(keyboardWasShown:)
+                                                 name:UIKeyboardWillShowNotification object:nil];
+    
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(keyboardWillBeHidden:)
+                                                 name:UIKeyboardWillHideNotification object:nil];
+    
+}
+
+// Called when the UIKeyboardDidShowNotification is sent.
+- (void)keyboardWasShown:(NSNotification*)aNotification
+{
+    NSDictionary* info = [aNotification userInfo];
+    CGSize kbSize = [[info objectForKey:UIKeyboardFrameEndUserInfoKey] CGRectValue].size;
+    
+    GLKView *view = (GLKView *)self.view;
+    CGRect frame = view.frame;
+    frame.size.height -= kbSize.height;
+    view.frame = frame;
+    App::I.resize(frame.size.width * view.contentScaleFactor,
+                  frame.size.height * view.contentScaleFactor);
+}
+
+// Called when the UIKeyboardWillHideNotification is sent
+- (void)keyboardWillBeHidden:(NSNotification*)aNotification
+{
+    CGRect frame = [[UIScreen mainScreen] bounds];
+    self.view.frame = frame;
+    App::I.resize(frame.size.width * self.view.contentScaleFactor,
+                  frame.size.height * self.view.contentScaleFactor);
+}
+
 - (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
 {
     UITouch *touch = [[event allTouches] anyObject];
@@ -122,6 +158,7 @@ int t_count = 0;
 - (void)viewDidAppear:(BOOL)animated
 {
     [self resignFirstResponder];
+    [self registerForKeyboardNotifications];
 }
 
 - (void)viewDidLoad