如何將對與數組連接以包含相同的索引？

我正在爲iOS開發一個測驗應用程序，並將問題保存在一個數組中，並將答案保存在另一個數組中。到目前爲止，我已經能夠用arc4random從問題數組中獲得一個隨機問題。但是，當我嘗試設置按鈕以顯示隨機答案選項時，它們與指定的問題不匹配。例如，question數組中index = 0處的問題與answers數組中index = 0處的answer數組一致，因此。如何隨時隨地產生正確的答案（換句話說，我如何確保它們都始終具有由arc4random方法或任何方法拉取的匹配索引）？如何將對與數組連接以包含相同的索引？

下面是我的一些代碼：

//random question generation function 
func randomQuestion() { 
    index = Int(arc4random_uniform(UInt32(questions.count))) 
    questionLabel.text = questions[index] 

let questions = ["Who is Thor's half brother?", "What is the name of Thor's hammer?", "What is Thor's father name?"] 

//Each correct answer is placed at index 0 (right answers are Atum, Mjolinr, & Odin) 
var answers = [["Atum", "Loki", "Red Norvell", "Kevin Masterson"], ["Mjolinr", "Uru", "Stormbreaker", "Odin's Staff"], ["Odin, "Sif", "Heimdall", "Balder"]] 


//This variable is used in a later function that helps randomize wear the correct answer will be placed randomly from a set of buttons 
var rightAnswerBox:UInt32 = 0 


IBAction func buttonAction(_ sender: AnyObject) { 

if (sender.tag == Int(rightAnswerBox)) { 



print ("Correct!") 
} 

else { 

    wrongSeg() 
print ("Wrong!") 

    } 

    if (currentQuestion != questions.count) 
    { 
     newQuestion() 
    } 
} 



override func viewDidAppear(_ animated: Bool) 
{ 
newQuestion() 


} 




//function that displays new question 
func newQuestion() 
{ 

//countdown timer section 




randomQuestion() 

rightAnswerBox = arc4random_uniform(4)+1 

//create a button 
var button:UIButton = UIButton() 

var x = 1 

for index in 1...4 
{ 
    //creat a button 
    button = view.viewWithTag(index) as! UIButton 

    if (index == Int(rightAnswerBox)) 
    { 
     button.setTitle(answers[currentQuestion][0], for: .normal) 



    } 

    else { 




     button.setTitle(answers[currentQuestion][x], for: .normal) 

    x += 1 
     } 
} 


currentQuestion += 1

}

來源

2017-07-19 Captain Code

而不是數組答案，你可以把問題的詞典作爲關鍵和答案作爲價值！ –

你可以隨機化一本字典嗎？ –

我還沒試過。但我瘦，你可以隨機排列字典鍵。 –

使用Dictionary分配的答案的適當的問題。

let QADictionary = ["Who is Thor's half brother?" : ["Atum", "Loki", "Red Norvell", "Kevin Masterson"],"What is the name of Thor's hammer?": ["Mjolinr", "Uru", "Stormbreaker", "Odin's Staff"], "What is Thor's father name?" : ["Odin", "Sif", "Heimdall", "Balder"] ] 


//Get question list 
let questionsList = Array(QADictionary.keys) 
// Random question index 
let index = Int(arc4random_uniform(UInt32(questionsList.count))) 
// Fetch question from list 
let question = questionsList[index] 
// Assign to label 
questionLabel.text = question 

//Get the answer for the randomly chosen question. Because you question is the `Key` for the dictionary. 
let answer = QADictionary[question]

來源

2017-07-19 09:31:33 Subramanian

有沒有辦法分別訪問密鑰的每個值？就像我想單獨設置每個答案值到一個按鈕一樣？（所以我會有四個按鈕，每個顯示與問號鍵配對的答案值） –

@CaptainCode'let answer = QADictionary [question]'會給你答案數組。迭代數組以獲取問題的值。 'questionLabel.text'有你的問題，那就是你的字典的關鍵。 – Subramanian

您可以通過使用我作爲示例給出的代碼來舉個例子嗎？我仍然困惑於我將如何訪問每個鍵（問題）的每個值（答案） –

@Saurabh Prajapati的建議是正確的爲您的要求。

Step1：首先將您的問題和解答存儲在字典中。

第2步：使用字典的關鍵字組成數組，如下所示。

例如，你的字典名稱是quizDic。

var questionsArray = quizDic.keys.Array

第三步：找到你questionsArray數和值傳遞給隨機生成的函數。

第4步：然後根據從questionsArray中隨機選擇的密鑰，從quizDic訪問您正確的答案。

來源

2017-07-19 09:31:38

如何將對與數組連接以包含相同的索引？

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