swift 4 - backgroundColorとボタンのタイトルが変更されない

Question

backgroundColorとbuttonのタイトル（setTitle）が変更（メインキューの下にディスパッチ）されると、何も起こりません。

// 
// ViewController.swift 
// HeaterControl 
// 
// Created by Eamon White on 11/7/17. 
// Copyright © 2017 EamonWhite. All rights reserved. 
// 

import UIKit 

class ViewController: UIViewController { 
    var button:HeaterButton = HeaterButton(); 
    var message:String = ""; 
    var status:Int = 0; 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     let button:HeaterButton = HeaterButton(); 
     button.setTitle("LOADING...", for: .normal); 
     button.addTarget(self, action:#selector(toggle), for: .touchUpInside); 
     self.view.addSubview(button); 

     self.getState(); 
     // Do any additional setup after loading the view, typically from a nib. 
    } 

    override func didReceiveMemoryWarning() { 
     super.didReceiveMemoryWarning() 
     // Dispose of any resources that can be recreated. 
    } 

    //GET STATE OF ESP8266 
    private func getState() { 

     let url = URL(string: "https://cloud.arest.io/w1zard/digital/2"); 
     URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in 

      guard let data = data, error == nil else { return } 

      do { 
       let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]; 

       self.status = (json["return_value"] as? Int)!; 
       print(self.status, ": status"); 

       if self.status == 0 { 
        DispatchQueue.main.async { // Correct 
         self.button.backgroundColor = .green; 
         self.button.setTitle("TURN OFF", for: .normal) 
        } 
       } 
       else { 
        DispatchQueue.main.async { // Correct 
         self.button.setTitle("TURN ON", for: .normal) 
        } 
       } 
      } catch let error as NSError { 
       print(error); 
      } 

     }).resume() 
    } 

    @objc private func toggle() { 

     let url = URL(string: "https://cloud.arest.io/w1zard/mode/2/o"); 
     URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in 

      guard let data = data, error == nil else { return } 

      do { 
       let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]; 
       self.message = json["message"] as! String; 
       print(self.message, ": message"); 

       if self.message == "Pin D2 set to output" { 
        if self.status == 0 { 
         let url = URL(string: "https://cloud.arest.io/w1zard/digital/2/1"); 
         URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in 

          guard let data = data, error == nil else { return } 

          do { 
           let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]; 
           self.message = json["message"] as! String; 
           print(self.message, ": message"); 

           if self.message == "Pin D2 set to 1" { 
            DispatchQueue.main.async { // Correct 
             self.button.backgroundColor = .green; 
             self.button.setTitle("TURN OFF", for: .normal) 
             self.status = 1; 
            } 
           } 
           else { 
            let alert = UIAlertController(title: "ALERT", message: "Didn't turn on.", preferredStyle: .alert) 
            alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .`default`, handler: { _ in 
             print("The \"OK\" alert occured.") 
            })) 
            self.present(alert, animated: true, completion: nil) 
           } 
          } catch let error as NSError { 
           print(error); 
          } 

         }).resume() 
        } 
        else { 
         let url = URL(string: "https://cloud.arest.io/w1zard/digital/2/0"); 
         URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in 

          guard let data = data, error == nil else { return } 

          do { 
           let json = try JSONSerialization.jsonObject(with: data, options: .allowFragments) as! [String:Any]; 
           self.message = json["message"] as! String; 
           print(self.message, ": message"); 

           if self.message == "Pin D2 set to 0" { 
            DispatchQueue.main.async { // Correct 
             self.button.backgroundColor = .green; 
             self.button.setTitle("TURN OFF", for: .normal) 
            } 
           } 
           else { 
            let alert = UIAlertController(title: "ALERT", message: "Something went wrong.", preferredStyle: .alert) 
            alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .`default`, handler: { _ in 
             print("The \"OK\" alert occured.") 
            })) 
            self.present(alert, animated: true, completion: nil) 
           } 
          } catch let error as NSError { 
           print(error); 
          } 

         }).resume() 
        } 
       } 
       else { 
        let alert = UIAlertController(title: "ALERT", message: "Couldn't set mode.", preferredStyle: .alert) 
        alert.addAction(UIAlertAction(title: NSLocalizedString("OK", comment: "Default action"), style: .`default`, handler: { _ in 
         print("The \"OK\" alert occured.") 
        })) 
        self.present(alert, animated: true, completion: nil) 
       } 
      } catch let error as NSError { 
       print(error); 
      } 

     }).resume() 
    } 
} 

Answer 1

私はbutton二度宣言した：

class ViewController: UIViewController { 
    var button:HeaterButton = HeaterButton(); 
    var message:String = ""; 
    var status:Int = 0; 

    override func viewDidLoad() { 
     super.viewDidLoad() 

     let button:HeaterButton = HeaterButton(); 

...