Allowing single digit in UITextField in iOS

Question

I have a Verification ViewController, I get 4 digit verification code by SMS and I need to enter those code to login, I have created the ViewController

Answer 1

Try this sample tutorial passcode lock

ViewController.h

#import 
@interface ViewController : UIViewController
{
 IBOutlet UITextField *txtPassword;
}
 @end

ViewController.m

- (void)viewDidLoad
{
[super viewDidLoad];
txtPassword.delegate=self;
}


- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string 
{
NSUInteger newLength = [textField.text length] + [string length] - range.length;
return (newLength > 1) ? NO : YES;
}