Question

我试图使用swift代码在apple xcode程序中创建我的第一个游戏，但我遇到了Arrays的问题。这是代码：

//
//  ViewController.swift
//  War
//
//  Created by grayson seymour  on 5/13/16.
//  Copyright © 2016 SanGames. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var firstCardImageView: UIImageView!
    @IBOutlet weak var secondCardImageView: UIImageView!
    @IBOutlet weak var playRoundButton: UIButton!
    @IBOutlet weak var backgroundImageView: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.playRoundButton.setTitle("Play", forState: UIControlState.Normal)
    }

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

    @IBAction func playRoundTapped(sender: UIButton) {

        var cardNamesArray:[String] = ["card0", "card1", "card2", "card3", "card4", "card5", "card6", "card7", "card8", "card9"]

        // Creates randomly generated number for first and second card
        let randomCardFirst = Int(arc4random_uniform(10))
        let randomCardSecond = Int(arc4random_uniform(10))

        // checks to see what imageview to set for the cards
        let firstCardString:String = self.cardNamesArray[randomCardFirst]
        let secondCardString:String = self.cardNamesArray[randomCardSecond]

        // sets randomly generated number to imageview for second and first card
        self.firstCardImageView.image = UIImage(named: firstCardString)
        self.secondCardImageView.image = UIImage(named: secondCardString)
    }

}

我在第39行和第39行收到错误40或更具体地说

let firstCardString:String = self.cardNamesArray[randomCardFirst]
let secondCardString:String = self.cardNamesArray[randomCardSecond]

我得到的错误是

视图控制器类型的值没有成员cardNamesArray

因为我对这种语言很陌生，所以我在代码中稍微涉足一下，看看我是否能解决问题，但我所做的一切只会造成另一个错误。任何帮助将非常感激。谢谢！

Answer 1

为什么在变量之前调用self（因为你的类没有名为cardNamesArray的变量），这个变量在你的函数内部（意味着它不是global），所以不应该致电self。

替换

let firstCardString:String = self.cardNamesArray[randomCardFirst]
let secondCardString:String = self.cardNamesArray[randomCardSecond]

通过

let firstCardString:String = cardNamesArray[randomCardFirst]
let secondCardString:String = cardNamesArray[randomCardSecond]

如果您只想在函数中使用此cardNamesArray，可以尝试上面的解决方案。

如果您想在课堂上多次使用它，可以将cardNamesArray声明为全局变量。

View Controller无法访问文件中的元素

1 个答案: