done button on numberkeypad is not working - iphone

Question

I am using a text field to enter mobile nuber and I would like to add done button to hide the keyboard, following is my code
- (void)keyboardWillShow:(NSNotification *)note {
// create custom button
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 163, 106, 53);
doneButton.adjustsImageWhenHighlighted = NO;
[doneButton setImage:[UIImage imageNamed:#"doneup.png"] forState:UIControlStateNormal];
[doneButton setImage:[UIImage imageNamed:#"donedown.png"] forState:UIControlStateHighlighted];
[doneButton addTarget:self action:#selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];
// locate keyboard view
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows]objectAtIndex:1];
UIView* keyboard;
for(int i=0; i<[tempWindow.subviews count]; i++) {
keyboard = [tempWindow.subviews objectAtIndex:i];
// keyboard found, add the button
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 3.2) {
if([[keyboard description] hasPrefix:#"<UIPeripheralHost"] == YES)
[keyboard addSubview:doneButton];
} else {
if([[keyboard description] hasPrefix:#"<UIKeyboard"] == YES)
[keyboard addSubview:doneButton];
}
}
}
but I am unable to add the done button ,after cross check with break points , I observe that control is not entering into the if([[keyboard description] hasPrefix:#"UIKeyboard"] == YES) conditon.
I am using IOS5.

Answer 1

I did add a custom done-button in one of my projects too. The tutorial I used mentioned that piece of code:
if([[[UIDevice currentDevice] systemVersion] floatValue] >= 3.2)
{
if([[tmpKeyboard description] hasPrefix:#"<UIPeripheralHost"] == TRUE)
[tmpKeyboard addSubview:doneButton];
}
else
{
if([[tmpKeyboard description] hasPrefix:#"<UIKeyboard"] == TRUE)
[tmpKeyboard addSubview:doneButton];
}
Prior to iOS version 3.2 your approach with UIKeyboard is fine, but later you have to change it to UIPeripheralHost.