title: How to hide keyboard when UIDatePicker opened in iOS 8
body: <p>I have updated iOS version to 8.2 but now facing some issues with UIDatePicker and UITextfield keyboard hiding.In iOS 8 UIActionsheet is not supported so I have changed my code to show date Picker but now keyboard is not getting hide when picker opened. 
  here is my code for datepicker :</p>
  
  <pre><code>- (void)textFieldDidBeginEditing:(UITextField *)textField
  {
  [textField resignFirstResponder];
  
      UIView *myView = [[UIView alloc] initWithFrame:CGRectMake(0, 0,self.view.bounds.size.width, self.view.bounds.size.height)];
      [myView setBackgroundColor:[UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:0.5]];
      [self.view addSubview:myView];
  
      UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height - 244, self.view.bounds.size.width, 44)];
  
      UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(dismissActionSheet)];
      toolbar.items = @[[[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil], done];
      toolbar.barStyle = UIBarStyleBlackOpaque;
      [self.view addSubview:toolbar];
  
     UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, self.view.bounds.size.height - 200, 0, 0)];
      datePicker.datePickerMode = UIDatePickerModeDate;
      datePicker.hidden = NO;
      datePicker.date = [NSDate date];
      datePicker.maximumDate = [NSDate date];
      [datePicker addTarget:self
                     action:@selector(LabelChange:)
           forControlEvents:UIControlEventValueChanged];
      [self.view addSubview:datePicker];
  }
  </code></pre>
  
  <p>but keyboard is not getting hide.</p>