Is there any notification that gets sent when the Keyboard changes (like from NumberPad to Default)

Question

I am trying to figure out how I can get notified when the keyboard changes. What I am trying to do is add a DONE button to keyboard of type 4 & 5 (NumberPad and PhonePad), everything is working fine, except when I transition from a TextField using a Default KB type, The notification that the KeyboardDidAppear isn't being fired.

Here is what I got:

- (void)viewDidLoad
{
    [super viewDidLoad];

    [[NSNotificationCenter defaultCenter] addObserver:self 
                                             selector:@selector(keyboardDidShow:) 
                                                 name:UIKeyboardDidShowNotification 
                                               object:nil]; 

}

Then I added a Property for the current KB type and the current TextField being edited:

#pragma mark - Delegate Methods
-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    self.currentKBType = textField.keyboardType;
    self.curTextField = textField;
    return YES;
}

I then make a decision on whether or not to add that DONE button based on the current KB type:

- (void)keyboardDidShow:(NSNotification *)note {
    if (self.currentKBType == 4 || self.currentKBType == 5) {
        [self addButtonToKeyboard];
    }
}

Problem is that the notification fires when the keyboard is displayed, but not when it changes (transitions from one TextField to another that specifies a different KB type.

Any suggestions? Am I missing something?

score 6 · Accepted Answer · answered Mar 28 '12 at 01:08

Got this figured out. Took a little logic, but it works flawlessly. Here is what I did: Added private properties for:

@property (nonatomic) UIKeyboardType currentKBType;
@property(nonatomic,strong) UITextField *curTextField;
@property(nonatomic,strong) UIButton *doneButton;
@property(nonatomic) BOOL doneButtonDisplayed;

Then added the following logic in the both the TextField delegate method:

-(BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
    self.currentKBType = textField.keyboardType;
    if (textField.keyboardType == 4 || textField.keyboardType == 5) {
        if (!doneButtonDisplayed) {
            [self addButtonToKeyboard];
        }
    } else {
        if (doneButtonDisplayed) {
            [self removeButtonFromKeyboard];
        }
    }

    self.curTextField = textField;
    return YES;
}

And in the KeyboardDidShowNotification that I signed the VC up for in the viewDidLoad:

- (void)keyboardDidShow:(NSNotification *)note {
    if (self.currentKBType == 4 || self.currentKBType == 5) {
        if (!doneButtonDisplayed) {
            [self addButtonToKeyboard];
        }
    } else {
        if (doneButtonDisplayed) {
            [self removeButtonFromKeyboard];
        }
    }
}

And the two methods referenced in these methods:

- (void)addButtonToKeyboard {

    // create custom button
    doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
    doneButton.frame = CGRectMake(0, 163, 106, 53);
    doneButton.adjustsImageWhenHighlighted = NO;

    [doneButton setImage:[UIImage imageNamed:@"DoneNormal.png"] forState:UIControlStateNormal];
    [doneButton setImage:[UIImage imageNamed:@"DoneHL.png"] forState:UIControlStateHighlighted];

    [doneButton addTarget:self action:@selector(resignKeyboard) forControlEvents:UIControlEventTouchUpInside];
    // locate keyboard view
    if ([[[UIApplication sharedApplication] windows] count] > 1) {
        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([[keyboard description] hasPrefix:@"<UIPeripheralHost"] == YES) {
                [keyboard addSubview:doneButton];
                self.doneButtonDisplayed = YES;
            }
        }

    }
}

- (void)removeButtonFromKeyboard {  
    [doneButton removeFromSuperview];
    self.doneButtonDisplayed = NO;
}

And finally, the resignKeyboard method that is called whenever the Done button is touched:

-(void)resignKeyboard {
    [self.curTextField resignFirstResponder];
    self.doneButtonDisplayed = NO;
}

This will add that Done button whenever a NumberPad or PhonePad type keyboard is displayed and remove it (only when it has been added) from the other keyboard types.

Tested and works great.

Code is working fine. But when I click on number keyboard very first time then done button is not visible. Could you please do it for that as well? — Lalit Paliwal, Jan 13 '14 at 13:30

Is there any notification that gets sent when the Keyboard changes (like from NumberPad to Default)

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