ios - 'count'不能用于'ViewController'类型

我在用swift向类传递值时遇到问题，我有ViewControler.swift来创建对象和其他UI类型的东西。代码如下：

class ViewController: UIViewController {


    //creates the Intractive button objects

    @IBOutlet var Bag1: UIButton!

    @IBOutlet var Bag2: UIButton!

    @IBOutlet var Bag3: UIButton!

    @IBOutlet var lblTokenSlider: UILabel!
    @IBOutlet var slider: UIStepper!

    @IBOutlet var Go: UIButton!

    @IBOutlet var counter: UILabel!


    var count  = 10
    var noOfBags = 3
    //gives acces to game AP!
    var gameAPI = GameAPI(noOfBags: count, noOfTokens: noOfBags )

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
        lblTokenSlider.hidden = true
        slider.hidden = true
        Go.hidden = true
        counter.hidden = true
        Bag3.hidden = false
    }


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

    // Event Drivers

    @IBAction func btnBag1(sender: AnyObject) {
        Bag1.userInteractionEnabled = false
        Bag2.userInteractionEnabled = false
        Bag3.userInteractionEnabled = false

    }


    @IBAction func btnBag2(sender: AnyObject) {

    }

    @IBAction func btnBag3(sender: AnyObject) {

    }

    @IBAction func SliderAction(sender: AnyObject) {

    }
    @IBAction func RemoveTokens(sender: AnyObject) {
    }

    }
}

这是我的gameAPI：

import Foundation

private enum MoveError: ErrorType {
    case Empty
}
class GameAPI {
    var noOfBags: Int
    var bagArray:[Bag] = []

    init(noOfBags: Int, noOfTokens : Int){
        self.noOfBags = noOfBags
        for _ in 0..<noOfBags {
            bagArray.append(Bag(counter: noOfTokens))
        }
    }

    /* Returns the amount of counters are in a bag */
    func getCounts(i :Int ) -> Int {
        return bagArray[i].getCount()
    }

    func isBagEmpty(i: Int) -> Bool {
        if (bagArray[i].getCount() <= 0){
            return true
        }
        else {
            return false
        }
    }

    func removeCounter(bagToRemove: Int, counters: Int ) throws{
        do {
            try self.bagArray[bagToRemove].removeCount(counters)
        }
        catch{
            throw MoveError.Empty
        }
    }

}

问题是我在ViewController中声明GameAPI时
不能对类型“ViewController”使用“Instance member”count
在线
var gameAPI = GameAPI(noOfBags: count, noOfTokens: noOfBags )
但如果我把变量换掉，使用固定值，比如：
var gameAPI = GameAPI(noOfBags: 10, noOfTokens: 3 )
它工作得很好。我真的不明白为什么这不管用。
谢谢你

最佳答案

问题是，您有一个实例变量的初始值设定项使用另一个实例变量。通常，在初始化所有实例变量之前，不能使用实例变量。因此，必须打破实例变量之间的依赖关系。
你有几个选择：
将初始化移到初始化程序。不过，这对于UIViewController来说有点困难，因为您至少需要两个初始值设定项，这会导致代码重复：

init(...) {
   let count = 10
   let noOfBags = 3

   self.count = count
   self.noOfBags = noOfBags
   self.gameAPI = GameAPI(noOfBags: count, noOfTokens: noOfBags)

   super.init(...)
}

声明count和noOfBags为全局常量：

static let count = 10
static let noOfBags = 3

因此，GameAPI初始值设定项不会使用self。
如果需要count和noOfBags作为变量，可以创建全局常量initialCount和initialNoOfBags，然后

var count = initialCount
var noOfBags = initialNoOfBags
var gameAPI = GameAPI(noOfBags: initialCount, noOfTokens: initialNoOfBags)

您可以懒洋洋地初始化您的gameAPI：

lazy var gameAPI: GameAPI = GameAPI(noOfBags: self.count, noOfTokens: self.noOfBags)

关于ios - 'count'不能用于'ViewController'类型，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/38816847/

GameApi

ios - 'count'不能用于'ViewController'类型