How to achieve that placeholder text disappears character by character in UITextField

Question

Can you please help me.

In UITextField when we provide a placeholder text its placeholder string will be gone when we enter any character. How can I achieve

Answer 1

I guess this is just what you are looking for. Create your UITextField object with the text _2_-__-__A (not placeholder text). Then, use its view controller as delegate, and add that to the view controller:

-(BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string{
    if (range.length>1) return NO; // Avoids removing multiple characters at once
    if (range.location==1) range.location++;  // '2' index
    if (range.location==3) range.location++;  // '-' index
    if (range.location==6) range.location++;  // '-' index
    if (range.location==9)  return NO; // 'A' index
    if (range.location==10) return NO; // String end
    if ([string isEqualToString:@""]) return NO; //Avoids removing characters

    if (range.length==0) {
        range.length++;
        UITextPosition *beginning = textField.beginningOfDocument;
        UITextPosition *start = [textField positionFromPosition:beginning offset:range.location];
        UITextPosition *end = [textField positionFromPosition:start offset:range.length];
        UITextRange *textRange = [textField textRangeFromPosition:start toPosition:end];
        [textField setSelectedTextRange:textRange];
    }

    return YES;
}
-(void)textFieldDidBeginEditing:(UITextField*)textField{
    UITextPosition *beginning = textField.beginningOfDocument;
    UITextPosition *start = [textField positionFromPosition:beginning offset:0];
    UITextPosition *end = [textField positionFromPosition:start offset:0];
    UITextRange *textRange = [textField textRangeFromPosition:start toPosition:end];
    [textField setSelectedTextRange:textRange];
}
-(BOOL)textFieldShouldReturn:(UITextField*)textField{
    [passwordInput resignFirstResponder];
    return YES;
}

It should work as intended.