UITextFieldTextDidChangeNotification iOS7 not fired

Question

I'm using this piece of code to get informed about changing text of a UITextField.

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textUpdated) name: UITextFieldTextDidChangeNotification object:self.inputValueField.text];

Works fine with iOS6 but is not getting called with iOS7. Any ideas?

Answer 1

The Problem is, that you are passing the wrong object. You are passing the NSString in your UITextField, but should passthe UITextField itself.

[[NSNotificationCenter defaultCenter] addObserver:self 
        selector:@selector(textUpdated)
        name: UITextFieldTextDidChangeNotification
        object:self.inputValueField];

This should work.

Answer 2

Better using NSNotificationCenter. Here is a code snippet from a passcode managing section of an app.

Initialize NSNotificationCenter in viewDidLoad

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textDidChange:) name: UITextFieldTextDidChangeNotification object:nil];

then declare its method textDidChange:

- (void)textDidChange:(NSNotification*)notification
{
    UITextField *textField = (UITextField *)[notification object];
    DBG(@"%@", textField.text);
    if(textField == self.txtPasscode1 && textField.text.length == 1)
    {
        [self.txtPasscode2 becomeFirstResponder];
    }
    if(textField == self.txtPasscode2 && textField.text.length == 1)
    {
        [self.txtPasscode3 becomeFirstResponder];
    }
    if(textField == self.txtPasscode3 && textField.text.length == 1)
    {
        [self.txtPasscode4 becomeFirstResponder];
    }
    if(textField == self.txtPasscode4 && textField.text.length == 1)
    {
        [self.txtPasscode1 becomeFirstResponder];
    }
}