This trick dismissed the keyboard, no matter which text field or textview is currently active.

1.  viewdidLoad


  UITapGestureRecognizer *gestureRecognizer =
 [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(hideKeyboard)];

gestureRecognizer.cancelsTouchesInView = NO;

[self.navigationController.view addGestureRecognizer:gestureRecognizer];

2. 

- (void)hideKeyboard

{

// This trick dismissed the keyboard, no matter which text field or text

// view is currently active.

[[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

}