iPhone how to get UITextField's text while typing?

1. First add one UITextField and UILabel to storyboard / nib
2. Now assign IBOutlet for UILabel (Here I have used myLabel)
3. Assign UITextFieldDelegate to file owner, also implement the same delegate in .h file

4. Use these lines of code:

   - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];    [self updateTextLabelsWithText: newString];    return YES;}-(void)updateTextLabelsWithText:(NSString *)string{     [myLabel setText:string];}

Hope this helps.

Simply handle the "Editing Changed" event

[textField addTarget:self               action:@selector(editingChanged:)    forControlEvents:UIControlEventEditingChanged];

and the selector:

-(void) editingChanged:(id)sender {   // your code}

You can do this manually, or with the storyboard by CTRL-Dragging the "Editing changed" Sent event to your .h, creating the editingChanged method for you.

Swift with addTarget Swift 2.0+

   titleTextField.addTarget(self, action: #selector(textFieldTyping), forControlEvents: .EditingChanged)

And implement selector

func textFieldTyping(textField:UITextField){    //Typing}