测验显示相同的问题

Question

我有一个类似测验的应用程序。它经常出现所有问题。我如何让他们只出现一次，所以在最后一个问题后，会弹出一条消息？

func nextText(){ 
     let randomNumber = Int(arc4random_uniform(4)) 
     var textLabel = "" as NSString 
     switch (randomNumber){ 
     case 1: 
      textLabel = "Question1." 
      break 
     case 2: 
      textLabel = "Question2." 
      break 
     case 3: 
      textLabel = "Question3." 
      break 
     case 4: 
      textLabel = "Question4." 
      break 
     default: 
      textLabel = "Question 5" 
     } 
     self.textLabel.text = textLabel as? String 
    } 
} 

Answer 1

只要把不同的情况下，内部：

func nextText(){ 
     let randomNumber = Int(arc4random_uniform(4)) 
     var textLabel = "" as NSString 
     switch (randomNumber){ 
     case 1: 
      textLabel = "Question1." 
      self.textLabel.text = textLabel as? String 
      break 
     case 2: 
      textLabel = "Question2." 
      self.textLabel.text = textLabel as? String 
      break 
     case 3: 
      textLabel = "Question3." 
      self.textLabel.text = textLabel as? String 
      break 
     case 4: 
      textLabel = "Question4." 
      self.textLabel.text = textLabel as? String 
      break 
     default: 
      textLabel = "Question 5" 
      self.textLabel.text = textLabel as? String 
     } 
    } 

Answer 2

也许你可以存储问题作为一个数组。然后创建了一系列混合问题。然后运行向用户展示问题的阵列。一旦你到了阵列中的最后一个问题，你可以显示你的弹出消息。这里有一个例子：

洗牌阵列，从How do I shuffle an array in Swift?

extension Array { 
    func shuffled() -> [T] { 
     var list = self 
     for i in 0..<(list.count - 1) { 
      let j = Int(arc4random_uniform(UInt32(list.count - i))) + i 
      swap(&list[i], &list[j]) 
     } 
     return list 
    } 
} 

2.您的问题：

let questions = ["Question1", "Question2", "Question3", "Question4"] 
let shuffledQuestions = questions.shuffled() 

枚举通过你的洗牌问题：

var questionIndex = 0 

for question in shuffledQuestions { 
    // Present the question to the user 
    self.textLabel.text = question 
    questionIndex++ 
} 

4.一旦用户到达最后一个问题出现弹出窗口。例如。当questionIndex == shuffledQuestions.count

Answer 3

定义一个可变数组。将randomNumber添加到数组中。检查randomNumber是否存在于数组中。如果它存在重现一个随机数。

这是你的问题在Objective - C：

//Defining an array 
@property NSMutableArray *asked; 


-(void) nextText{ 
//This will generate a random number between 1 and 5. 
int randomNumber = arc4random() % 5+1; 

NSString * textLabel =nil; 

//This will check all questions are asked 
if ([asked count] ==5) { 
    self.myLabel.text = @"All questions completed"; 
    return; 
} 

//This will check is random number asked 
if ([asked containsObject:[NSString stringWithFormat:@"%i",randomNumber]]) { 
    return; 
} 

//This will add random number to asked questions and will ask the question of random number 
else{ 
    [asked addObject:[NSString stringWithFormat:@"%i",randomNumber]]; 
    switch (randomNumber){ 
     case 1: 
      textLabel = @"Question1."; 
      break; 
     case 2: 
      textLabel = @"Question2."; 
      break; 
     case 3: 
      textLabel = @"Question3."; 
      break; 
     case 4: 
      textLabel = @"Question4."; 
      break; 
     case 5: 
      textLabel = @"Question5."; 
      break; 
    } 
    self.myLabel.text = textLabel; 
    } 
} 

//If you want more than limited question, create and fill question array 
//After you can ask like this. Change else part with this 
else{ 
    [asked addObject:[NSString stringWithFormat:@"%i",randomNumber]]; 
    self.myLabel.text = [questions objectAtIndex:randomNumber]; 
    } 

Answer 4

你为什么不干脆把问题一个数组，并从中弹出每次你展示一个问题吗？所以你可以做这样的事情：

var questions = ["Question1", "Question2", "Question3", "Question4", "Question5"] 

for var i = questions.count; i > 0; { 
    let randomNumber = Int(arc4random_uniform(UInt32(--i))) 
    let textLabel = questions[randomNumber] as String 
    println(textLabel) 
    questions.removeAtIndex(randomNumber) 
} 

if questions.count == 0 { 
    println("should show the popup") 
}