Password Rules using swift IOS and parse

I am trying to set the password rules for an app I am building using swift and parse. I have the swift code but it is not compatible with parse. Help please.

Would you mind posting your swift code?

// Storing username and password in the database
@IBAction func signUp(_ sender: Any){
let user = PFUser()
user.username = emailField.text!
user.password = passwordField.text!
user.email = emailField.text!

    // customizing password rules
    
   
    
    // adding objects to the user class

    user["firstname"] = firstnameField.text!
    user["lastname"] = lastnameField.text!
	//user["newUser"] = true
    
   
    
	if !firstnameField.hasText || !lastnameField.hasText || !emailField.hasText || !passwordField.hasText {
		let alert = UIAlertController(title: "Oops!", message: "Please fill out all of the required information", preferredStyle: .alert)
		alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action) in
			
		}))
		self.present(alert, animated: true)
		print("Error:")
	} else {
		user.signUpInBackground { (success, error) in
			if success{
				self.performSegue(withIdentifier: "ToSetupProfile", sender: nil)
			} else {
			let alert = UIAlertController(title: "Oops!", message: error?.localizedDescription, preferredStyle: .alert)
			alert.addAction(UIAlertAction(title: "Ok", style: .default, handler: { (action) in
				print(error.debugDescription)
			}))
			self.present(alert, animated: true)
			print("Error: \(String(describing: error.debugDescription))")
		 }
	}
	}

}