UITextView with DatePicker

I have an UITextView and one of my methods requires to change the UITextView inputView to an UIDatePicker, so the user can select a date for a reminder.

Here is the code I used

self.datePicker = [[UIDatePicker alloc] init];
self.noteTextView.inputView = self.datePicker;
[self.noteTextView becomeFirstResponder];

everything works perfectly, but I can't manage to switch back from datePicker to the default keyboard. What I have tried is the following code:

self.noteTextView.inputView = UIKeyboardTypeDefault;