Question

我有这个代码用于我想要的问答应用程序。它应该从数组中提出一个随机问题。我的代码在操场上工作，但当我把它放入xcode项目时，它告诉我：

无法使用实例成员＆＃39; Kat1＆＃39;在属性初始化器内;属性初始化程序在“自我”之前运行是可用的

我是编码应用程序和swift的新手，我不知道如何以正确的方式初始化数组。

以下是使用的代码：

var Kat1: [(question: String, answer: String)] =
    [
        ("What is the capital of Alabama?", "Montgomery"),
        ("What is the capital of Alaska?", "Juneau"),
        ("What is the capital of Test?", "Test Town")
]

var antal = (Kat1.count)
var randomtal = Int(arc4random_uniform(UInt32(antal)))

print(Kat1[randomtal].question)
print(Kat1[randomtal].answer)`

我做错了什么？

Answer 1

将代码放在函数中....

   override func viewDidLoad() {
    super.viewDidLoad()

var Kat1: [(question: String, answer: String)] =
[
    ("What is the capital of Alabama?", "Montgomery"),
    ("What is the capital of Alaska?", "Juneau"),
    ("What is the capital of Test?", "Test Town")
]

var antal = (Kat1.count)
var randomtal = Int(arc4random_uniform(UInt32(antal)))

print(Kat1[randomtal].question)
print(Kat1[randomtal].answer)`
}

Answer 2

您可能希望将问题和答案打包成一个可以容纳所有问题的结构，并根据要求提供个别问题。这将允许您将存储问题的代码和呈现问题的代码分开。

struct Quiz {
    var kat1: [(question: String, answer: String)] =
        [("What is the capital of Alabama?", "Montgomery"),
         ("What is the capital of Alaska?", "Juneau"),
         ("What is the capital of Test?", "Test Town")]

    func randomQuestion() -> (question: String, answer: String) {
        let randomtal = Int(arc4random_uniform(UInt32(kat1.count)))
        return kat1[randomtal]
    }
}

let quiz = Quiz()
let qa   = quiz.randomQuestion()
print(qa.question)
print(qa.answer)

如何在swift中初始化我的数组

2 个答案: