Question

我有一个类似于测验的应用程序。它经常显示所有问题。如何让它们只显示一次，所以在最后一个问题之后会弹出一条消息？

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

只是以不同的方式放入案件内部：

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

也许您可以将问题存储为数组。然后创建了一个混合问题的新数组。然后运行向用户呈现问题的阵列。一旦你到达阵列中的最后一个问题，你就可以显示你的弹出消息。这是一个例子：

1。从How do I shuffle an array in Swift?

随机播放数组

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()

3。列举您的改组问题：

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，就会出现弹出窗口。例如。何时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。如果它存在再现一个随机数。

这是你的目标问题 - 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

为什么不在每次显示问题时将问题放在一个数组中并从中弹出？所以你可以这样做：

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")
}

测验显示相同的问题

4 个答案: