Question

我有一个领域数据库。这样数据库就更具可读性。我设计了如下问题库：

class Question: Object {
    @objc dynamic var id: Int = 0
    @objc dynamic var name: String = ""
    @objc dynamic var answered: Bool = false
    @objc dynamic var lastAnswer: Bool = false
    @objc dynamic var howManyTimesAnswered: Int = 0
    @objc dynamic var answer0: String = ""
    @objc dynamic var answer1: String = ""
    @objc dynamic var answer2: String = ""
    @objc dynamic var answer3: String = ""
    @objc dynamic var correctAnswer: Int = 0
    let parentCategory = LinkingObjects(fromType: Category.self, property: "questions") //back relationship to category
}

我试图提取答案并将它们放入元组数组（String，Bool）

 var currentAnswers = [(String, Bool)]()
    for i in 0...3 {
        if i == question.correctAnswer {
            currentAnswers.append(("question.answer2", true))
        } else {
            currentAnswers.append((question.answer1, false))
        }
    }

我想要实现的是这样的，答案被拉出来等于我显然下面的那个不会编译

    for i in 0...3 {
        if i == question.correctAnswer {
            currentAnswers.append((question.answer(i), true))
        } else {
            currentAnswers.append((question.answer(i), false))
        }
    }

Answer 1

您可以使用Key path试试此代码

  var currentAnswers = [(String, Bool)]()
    for i in 0...3 {
        if i == question.correctAnswer {
            currentAnswers.append((question.value(forKey: "answer\(i)") as! String, true))
        } else {
            currentAnswers.append((question.value(forKey: "answer\(i)") as! String, false))
        }
    }

Answer 2

我设法找到了解决方法。只有一行额外的代码。如果有人想要实现类似的东西，我希望这会有所帮助。

    var currentAnswers = [(String, Bool)]()
    let answers = [question.answer0, question.answer1, question.answer2, question.answer3]

    for i in 0...3 {
        if i == question.correctAnswer {
            currentAnswers.append((answers[i], true))
        } else {
            currentAnswers.append((answers[i], false))
        }
    }

我一直在使用上面的元组进行真正的随机化，以便答案总是以不同的顺序显示在答案按钮上。

使用swift中的循环从编号变量中提取数据

2 个答案: