Email validation on textField in iOS

Question

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

Answer 1

Swift

func validateEmail(email:String) -> Bool {

    let stricterFilter = false
    let stricterFilterString = "[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}"
    let laxString = ".+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2}[A-Za-z]*";
    let emailRegex = stricterFilter ? stricterFilterString : laxString
    let emailTest = NSPredicate(format: "SELF MATCHES %@", emailRegex)

    return emailTest.evaluate(with: email);
}

Answer 2

Function:

- (BOOL)validateEmail:(NSString *)enteredEmailID
{
    //checking valid email id or not
    NSString *emailReg = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailReg];
    return [emailTest evaluateWithObject:enteredEmailID];
}

Call it like:

if ([self validateEmail: textField.text])
        {
            //NSLog(@"Valid Email");
        }
        else
        {
            //NSLog(@"Invalid Email");
        }

EDIT: You can do this into textfield did end editing delegates or textfield should character change delegates