Toolbar above Keyboard not showing - iOS 11

The toolbar above the keyboard is not visible on iOS 11.0. It works fine with 11.0 versions.

Here is my code for adding a toolbar. So what should I add to render it on iOS 11.0:

UIToolbar* customToolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 60)];     
        customToolBar.barStyle = UIBarStyleDefault;
        customToolBar.items = [NSArray arrayWithObjects:
              [[UIBarButtonItem alloc] initWithTitle:@"+ Contact" 
                                    style:UIBarButtonItemStylePlain 
                                    target:self 
                                    action:@selector(showPicker:)],
               [[UIBarButtonItem 
          alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace 
               target:nil 
               action:nil],
              [[UIBarButtonItem alloc] initWithTitle:@"- Contact" 
                                     style:UIBarButtonItemStylePlain 
                                    target:self 
                                    action:@selector(HidePicker:)],
                               nil];
        [customToolBar sizeToFit];
        self.textView.inputAccessoryView=customToolBar;