How to catch a change in UITextField text?

Question

I have looked at all the similar questions and they are different than from what I am asking. I need to catch a change in the actual text in the UITextField, not just the state of editing. It will be a first responder when the view loads, and I need to know when text is entered so that I can enable "Next" in the navigation bar. Please help me if you can it's really holding me back in my project.

Addition: I am currently using - it doesn't work:

[textField addTarget:self action:@selector(textFieldDidChange)    forControlEvents:UIControlEventValueChanged];

score 3 · Accepted Answer · answered Jul 22 '12 at 23:58

3

Implement UITextFieldDelegate protocol, and respond to the textField:shouldChangeCharactersInRange:replacementString: method.

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)replacementStr {
    // Enable "Next" if you like what's entered in the replacementStr
}

answered Jul 22 '12 at 23:58

Sergey Kalinichenko

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Do you mean UITextFieldDelegate? And thanks I'll go try it out. – Redneys Jul 22 '12 at 23:59
@BenSender Yes, absolutely - that's the one, I just typed it incorrectly. – Sergey Kalinichenko Jul 23 '12 at 00:00

score 0 · Answer 2 · answered Jul 22 '12 at 23:57

0

Check the developer documents for UITextFieldDelegate, specifically this method

answered Jul 22 '12 at 23:57

8vius

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How to catch a change in UITextField text?

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