Email validation on textField in iOS

Question

In iOS App, how to add Email validation on UITextField?

Answer 1

- (BOOL)validateEmailAddress:(NSString*)yourEmail
{
    //create a regex string which includes all email validation
    NSString *emailRegex    = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";

    //create predicate with format matching your regex string
    NSPredicate *email  = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

    //return True if your email address matches the predicate just formed 
    return [email evaluateWithObject:yourEmail];`
}