adding custom button to number pad keyboard ios 6 - objective-c

Question

I am new in IOS & I am using IOS 6. I have more than one textfield in my code, one of them uses the Number pad keyboard and I want to add the custom button to it.
I am using this code:
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 view found; add the custom button to it
if([[keyboard description] hasPrefix:#"<UIPeripheralHost"] == TRUE)
[keyboard addSubview:doneButton];
}
Selector is called, but the problem is that the [[tempwindow.subviews]count] is 0.
Could anyone help me ?
Thanks in advance.

Answer 1

You can do this by checking following links.
Reference 1
Reference 2
But please do not do this.
Consider this:
what if the layout of the number keypad changes?
what if the colors of the keys change?
what if the implementation of the keyboard changes such that it's no
longer the window at index 1?
what if the implementation of the keyboard and peripheral host change
such that introspecting the description breaks?
what if you're running this on iPad where the keyboard has a totally
different layout?

Answer 2

For me, I am using the following code snippet to add button to the keyboard:
- (void)addHideKeyboardButtonToKeyboard {
// Locate non-UIWindow.
UIWindow *keyboardWindow = nil;
for (UIWindow *testWindow in [[UIApplication sharedApplication] windows]) {
if (![[testWindow class] isEqual:[UIWindow class]]) {
keyboardWindow = testWindow;
break;
}
}
if (!keyboardWindow) return;
// Locate UIKeyboard.
UIView *foundKeyboard = nil;
for (__strong UIView *possibleKeyboard in [keyboardWindow subviews]) {
// iOS 4 sticks the UIKeyboard inside a UIPeripheralHostView.
if ([[possibleKeyboard description] hasPrefix:#"<UIPeripheralHostView"]) {
for (__strong UIView *anotherPossibleKeyboard in [possibleKeyboard subviews]) {
if ([[anotherPossibleKeyboard description] hasPrefix:#"<UIKeyboard"]) {
foundKeyboard = possibleKeyboard;
break;
}
}
}
}
if (foundKeyboard) {
[foundKeyboard addSubview:self.keyboardDoneButton];
}
}

Answer 3

I have used following code. Check it.
- (void)textFieldDidBeginEditing:(UITextField *)textField {
if(textField==txt1)
{
[[NSNotificationCenter defaultCenter] addObserver: self
selector: #selector(keyboardDidShowOrHide:)
name: UIKeyboardDidShowNotification object:nil];
}
else
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidShowNotification object:nil];
}
}
- (void) keyboardDidShowOrHide : (id) sender {
// create custom button
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 427, 106, 53);
doneButton.adjustsImageWhenHighlighted = NO;
[doneButton setBackgroundImage:[UIImage imageNamed:#"doneup.png"] forState:UIControlStateNormal];
[doneButton setBackgroundImage:[UIImage imageNamed:#"donedown.png"] forState:UIControlStateHighlighted];
[doneButton addTarget:self action:#selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];
UIWindow* tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
[tempWindow addSubview:doneButton];
}
-(void)doneButton:(id)sender
{
UIButton *btntmp=sender;
[btntmp removeFromSuperview];
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIKeyboardDidShowNotification object:nil];
//[self setViewMovedUp:NO];
[txt1 resignFirstResponder];
}