如何保存变量的值？

Question

下面是我的代码的简要说明：

var myVar = 0

if (button image is equal to "mybutton image") {
    myVar = 1
    print("It works")
} else {
    myVar = 2
    print("Not working")
}

ButtonPress {
    print(myVar)
}

这里的问题是，当我运行应用程序时，我在控制台中看到它打印 "it works" 但是当我按下按钮时 myVar 等于 0 再次。我如何确定当我按下按钮时 myVar 等于 1？

这里是要求的完整代码：

@IBAction func ThingyButtton(_ sender: UIButton) {
    if let ButtonImage = myButton.image(for: .normal),
       let Image = UIImage(named: "LoseWeightGreen.png"),
       UIImagePNGRepresentation(ButtonImage) == UIImagePNGRepresentation(Image) {
        thingy = 1
        print("1")
    } else {
        thingy = 2
        print("2")
    }
}

@IBAction func ButtonThingyN(_ sender: UIButton) {
    if(thingy == 1) {
        print("ok")
        let storyboard = UIStoryboard(name: "let", bundle: nil)
        let secondVC = storyboard.instantiateViewController(withIdentifier: "FirstVC")as! FirstVC
        self.navigationController?.pushViewController(secondVC, animated: true) 
    } else{
        print("good")
        let storyboard = UIStoryboard(name: "let", bundle: nil)
        let secondVC = storyboard.instantiateViewController(withIdentifier: "SecondVC")as! SecondVC
        self.navigationController?.pushViewController(secondVC, animated: true)  
    }    
}

Answer 1

正如我在评论中所解释的那样，您在这里需要一些不同的逻辑尝试使用 switch 而不是 if else，

@IBAction func ThingyButtton(_ sender: UIButton) {
    let defaults = UserDefaults.standard
    if let ButtonImage = myButton.image(for: .normal),
       let Image = UIImage(named: "LoseWeightGreen.png"),
       UIImagePNGRepresentation(ButtonImage) == UIImagePNGRepresentation(Image) {
        defaults.set(1, forKey: "thingy")
        defaults.synchronize()
        print("1")
    } else {
        defaults.set(2, forKey: "thingy")
        defaults.synchronize()

        print("2")
    }
}



@IBAction func ButtonThingyN(_ sender: UIButton) {
    let defaults = UserDefaults.standard
    if defaults.object(forKey: "thingy") != nil {
          let thingy = defaults.integer(forKey: "thingy")
          let storyboard = UIStoryboard(name: "let", bundle: nil)
          switch thingy{
              case 1:
                  var moveTo = storyboard.instantiateViewController(withIdentifier: "FirstVC") as! FirstVC
          self.navigationController?.pushViewController(moveTo, animated: true)

                  break
              case 2:
                 var moveTo = storyboard.instantiateViewController(withIdentifier: "SecondVC") as! SecondVC
          self.navigationController?.pushViewController(moveTo, animated: true)

                  break
              default:
                  print("Thingy value is \(thingy)")
                  return
          }
     }



}

Answer 2

我可以使用 UserDefaults

简单地说，我只是将 userdefults 设置为 1 和 2，然后使用 if 语句检查它们！

如何保存变量的值？

How do I save the value of a variable?

var

button

swift