Set limit to UITextField in ObjectiveC

Question

I am creating login screen using Objective C in which i want to implement validation for User name(E-Mail) and password.How to implement this in very simple way.

Answer 1

You can always make use textField shouldChangeCharactersInRange delegate to handle the number of characters allowed in textField. Have look at the solution provided below :) Hope it helps

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
        if(textField == self.emailTextField){
            if (textField.text.length < 30 || string.length == 0){ 
                return YES;
            }
            else{
                return NO;
            }
        }
    }

EDIT

As per your comments you are not recieveing the textField delegates, so here is what you can do :)

In your ViewController, confirm the UITextFieldDelegate using,

YourViewController : UIViewController <UITextFieldDelegate>

In your viewDidLoad or ViewWillAppear set the textField delegate as self.

self.emailTextField.delegate = self;