How to limit the characters of textfield in iOS application up to 5 characters?

Question

I would like to limit the characters in textField of IOS Application. I tried all the methods given in Stack Overflow, so I am asking this question.

Here I used one Label (secure code) and one textfield (5 characters).

I had given the below code in viewcontroller.m file, but not working.

   myTextField.delegate = self

-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

{
   NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];

   return !([newString length] > 5);
}

http://stackoverflow.com/questions/433337/iphone-sdk-set-max-character-length-textfield — LE SANG, Feb 13 '13 at 05:47

esh · Accepted Answer · 2013-02-13T05:51:35.180

7

In ViewController.h, <UITextFieldDelegate> should be added.

In your viewDidLoad, myTextField.delegate = self should be added.

And then, to limit the number of characters:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range     replacementString:(NSString *)string
{
     if (textField.text.length >= 5 && range.length == 0)
        return NO;
     return YES;
}

Works for me. Try it.

EDIT:

On the other hand, your code should work perfectly fine as well. Check your code again.

edited Feb 13 '13 at 05:51

answered Feb 13 '13 at 05:46

esh

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I worked with this code. one issue is raised in ViewController.h file 'UITextFieldDelegate' not found. can U suggest me how to get out of this issue.. – kumar Sudheer Feb 13 '13 at 06:32
I added UIKit framework.my ViewContoller.m file is : [super viewDidLoad]; txtsecurecode.delegate = self -(BOOL)txtsecurecode:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string { NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string]; return !([newString length] > 5); } } error is in: -(BOOL) statement is "arithmetic on pointer to interface viewcontroller which is not a constant size in non-fragile abi".Can you help out to solve. – kumar Sudheer Feb 13 '13 at 07:04
`-(BOOL)txtsecurecode:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string` Change to `-(BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string` – esh Feb 13 '13 at 07:06
at the point of -(BOOL)textField issue: "use of UnDelacared identifier'textField' " is raised. how to overcome this. – kumar Sudheer Feb 13 '13 at 07:28
Okay. First up. Is your textfield linked as an IBOutlet? What is it called? Then put UITextFieldDelegate like this `@interface ViewController : UIViewController `. Next, you seem to have put `myTextField.delegate = self` in viewDidLoad, which is fine. **myTextField** should be your textfield name. Then add the method you have put up in the question. – esh Feb 13 '13 at 07:33
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/24416/discussion-between-sudheer-chekuri-and-blackflam3) – kumar Sudheer Feb 13 '13 at 07:34

score 0 · Answer 2 · answered Nov 22 '15 at 16:01

In swift: add UITextFieldDelegate as an extension. It makes your job easier.

Don't forget to set textField's delegate in viewDidLoad.

override func viewDidLoad() {
    super.viewDidLoad()

    // set the delegate
    textField.delegate = self
}

extension ViewController:UITextFieldDelegate {
  func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
    if textField.text?.characters.count >= 5 && range.length == 0 {
      return false
    }
    return true
  }
}

You can find a detailed example how to limit textfield by count and width: github source

How to limit the characters of textfield in iOS application up to 5 characters?

2 Answers2