Detect which uitextfield called the uikeyboard - objective-c

Question

After a lot of trouble I was able to add a RETURN button to a numerical key pad.
I want to delete it when introduciing other data into other uitextfields because currently that button appears everytime I use the keyboard, it's part of the keyboard.
Im adding the event handler on KeyBoardDidShow, otherwise it doesnt work,
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(keyboardWillShow:) name:UIKeyboardDidShowNotification object:nil];
Then in KeyboarWillShow
- (void)keyboardWillShow:(NSNotification *)note {
// create custom button
NSLog(#"El note es: %#", note);
UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
doneButton.frame = CGRectMake(0, 163, 106, 53);
doneButton.adjustsImageWhenHighlighted = NO;
[doneButton setImage:[UIImage imageNamed:#"done.jpg"] forState:UIControlStateNormal];
[doneButton setImage:[UIImage imageNamed:#"done_pressed.jpg"] forState:UIControlStateHighlighted];
[doneButton addTarget:self action:#selector(doneButton:) forControlEvents:UIControlEventTouchUpInside];
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 (UIView *possibleKeyboard in [keyboardWindow subviews]) {
// iOS 4 sticks the UIKeyboard inside a UIPeripheralHostView.
if ([[possibleKeyboard description] hasPrefix:#"<UIPeripheralHostView"]) {
possibleKeyboard = [[possibleKeyboard subviews] objectAtIndex:0];
}
if ([[possibleKeyboard description] hasPrefix:#"<UIKeyboard"]) {
foundKeyboard = possibleKeyboard;
break;
}
}
if (foundKeyboard) {
// Add the button to foundKeyboard.
[foundKeyboard addSubview:doneButton];
}
}
The thing is that this creates the button always! Obviously! I would like to create the button only in certains uitextfields, not in all, but how to do that?
The method - (BOOL)textFieldShouldBeginEditing: doesnt execute the first time, only the rest, why? Dont know, but if I was able to know which uitextfield is calling the keyboard my hair would grow again and I'd be slimmer, anyone can help?

Answer 1

textFieldShouldBeginEditing: only fires consistently if each and every one of your text fields have delegates set properly (check your XIB).
And then you can set a tag value in your text fields. You can display the Return button for fields with tag 1 and no Return button for fields with tag 0.

Answer 2

You can try to count the number of subviews inside the keyboard to know how many keys it has. That is a bad hack, but you already have a bad hack to find the keyboard :-)
Also another suggestion:
if (foundKeyboard) {
UIView *doneButton = [foundKeyboard viewWithTag:BUTTON_TAG];
if(numPad){
if(buttonView==nil){
//create doneButton
[foundKeyboard addSubview:doneButton];
}
}else{
[doneButton removeFromSuperview];
}
}