Swift Signup Controller

SignupViewController.swift

//
//  SignupViewController.swift
//
//  Created by Paul McKellar on 10/3/16.
//  Copyright © 2016 Paul McKellar. All rights reserved.
//

import Foundation
import UIKit

class SignupViewController: UIViewController, UITextFieldDelegate {

    var nameText: UITextField!
    var passwordText: UITextField!
    var signupButton: UIButton!
    var backButton: UIButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        self.view.backgroundColor = UIColor.white

        let padding = CGFloat(10)
        let corderRadius = CGFloat(2.0)

        self.nameText = UITextField()
        self.nameText.delegate = self
        self.nameText.placeholder = "name"
        self.nameText.frame = CGRect(x: padding, y: 44.0, width: self.view.frame.width - 2*padding, height: 44.0)
        self.nameText.layer.cornerRadius = corderRadius
        self.nameText.layer.borderWidth = 1.0
        self.nameText.layer.borderColor = UIColor.lightGray.cgColor
        self.nameText.autocapitalizationType = .none
        self.nameText.autocorrectionType = .no
        self.view.addSubview(nameText)

        self.passwordText = UITextField()
        self.passwordText.delegate = self
        self.passwordText.isSecureTextEntry = true
        self.passwordText.placeholder = "password"
        self.passwordText.frame = CGRect(x: padding, y: self.nameText.frame.maxY + padding, width: self.view.frame.width - 2*padding, height: 44.0)
        self.passwordText.layer.cornerRadius = corderRadius
        self.passwordText.layer.borderWidth = 1.0
        self.passwordText.layer.borderColor = UIColor.lightGray.cgColor
        self.view.addSubview(self.passwordText)

        self.signupButton = UIButton()
        self.signupButton.setTitle("Signup", for: .normal)
        self.signupButton.setTitleColor(UIColor.lightGray, for: .normal)
        self.signupButton.layer.cornerRadius = corderRadius
        self.signupButton.layer.borderWidth = 1.0
        self.signupButton.layer.borderColor = UIColor.lightGray.cgColor
        self.signupButton.addTarget(self, action: #selector(postUser), for: .touchUpInside)
        self.signupButton.frame = CGRect(x: padding, y: self.passwordText.frame.maxY + padding, width: self.view.frame.width - 2*padding, height: 44.0)
        self.view.addSubview(self.signupButton)

        self.backButton = UIButton()
        self.backButton.frame = CGRect(x: 0, y: self.signupButton.frame.maxY, width: self.view.frame.width, height: 44.0)
        self.backButton.setTitle("Back", for: .normal)
        self.backButton.setTitleColor(UIColor.lightGray, for: .normal)
        self.backButton.addTarget(self, action: #selector(dismissSignup), for: .touchUpInside)
        self.view.addSubview(self.backButton)

        self.nameText.becomeFirstResponder()
    }

    func dismissSignup() -> Void {
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "dismissSignup"), object: nil)
    }

    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if (textField == self.nameText) {
            self.passwordText.becomeFirstResponder()
        }
        else if (textField == self.passwordText) {
            self.view.endEditing(true)
            self.postUser()
        }
        return false
    }

    func postUser() -> Void {
        if (self.nameText.text == nil || self.passwordText.text == nil) {
            return
        }

        let req = NSMutableURLRequest(url: URL(string:"http://blurweb.dev/api/v1/users.json")!)
        req.httpMethod = "POST"

        let dic = ["user": ["name": self.nameText.text!, "password": self.passwordText.text!]]

        do {
            let jsonData = try JSONSerialization.data(withJSONObject: dic, options: .prettyPrinted)

            req.setValue("application/json", forHTTPHeaderField: "Accept")
            req.setValue("application/json; charset=utf-8", forHTTPHeaderField: "Content-Type")
            req.httpBody = jsonData

            let task = URLSession.shared.dataTask(with: req as URLRequest) { (data, response, error) -> Void in
                if error != nil {
                    print("Error signing up \(error)")
                } else {
                    do {
                        let responseDict = try JSONSerialization.jsonObject(with: data!, options: []) as? [String: AnyObject]
                        if (responseDict!["success"]!.boolValue as Bool) {
                            UserDefaults.standard.set(responseDict!["token"]!, forKey: "api_session")
                            NotificationCenter.default.post(name: NSNotification.Name(rawValue: "signedUp"), object: nil)
                        }
                    }
                    catch let error as NSError {
                        print("json parsing failure \(error)")
                    }
                }
            }
            task.resume()
        } catch let error as NSError {
            print(error)
        }
    }

}

A basic swift signup controller. I haven't used it yet, and it needs better error handling. But I'll update it as need be.