使用未解析的标识符“questionList”

Question

我知道这个错误意味着编译器无法识别该名称，但我不确定如何修复它。我将如何以不同方式设置变量以使其正常运行？我假设它必须做一些事情，questionsList 是一个 var 而不是 class？或者它可能需要包含在该行的其他地方？

var score = 0
for question in questionsList {
score += question.selectedAnswerIndex!**

（下面的完整代码：我删除了中间的一些代码以将其清理到 post，但这应该不是问题。我还在问题所在的位置加注星标出现)

import UIKit

struct Question {
var questionString: String?
var answers: [String]?
var selectedAnswerIndex: Int?
}

class QuestionController: UITableViewController {

let cellId = "cellId"
let headerId = "headerId"

var questionsList: [Question] = [Question(questionString: "What is your favorite type of food?", answers: ["Sandwiches", "Pizza", "Seafood", "Unagi"], selectedAnswerIndex: nil), Question(questionString: "What do you do for a living?", answers: ["Paleontologist", "Actor", "Chef", "Waitress"], selectedAnswerIndex: nil), Question(questionString: "Were you on a break?", answers: ["Yes", "No"], selectedAnswerIndex: nil)]

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.title = "Question"

        navigationController?.navigationBar.tintColor = UIColor.white
        navigationItem.backBarButtonItem = UIBarButtonItem(title: "Back", style: .plain, target: nil, action: nil)

        tableView.register(AnswerCell.self, forCellReuseIdentifier: cellId)
        tableView.register(QuestionHeader.self, forHeaderFooterViewReuseIdentifier: headerId)

        tableView.sectionHeaderHeight = 50
        tableView.tableFooterView = UIView()
    }

    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

        if let index = navigationController?.viewControllers.index(of: self) {
            let question = questionsList[index]
            if let count = question.answers?.count {
                return count
            }
        }
        return 0

....

class ResultsController: UIViewController {

    let resultsLabel: UILabel = {
        let label = UILabel()
        label.text = "Congratulations, you'd make a great Ross!"
        label.translatesAutoresizingMaskIntoConstraints = false
        label.textAlignment = .center
        label.font = UIFont.boldSystemFont(ofSize: 14)
        return label
    }()

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Done", style: .plain, target: self, action: Selector(("done")))

        navigationItem.title = "Results"

        view.backgroundColor = UIColor.white

        view.addSubview(resultsLabel)
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "H:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": resultsLabel]))
        view.addConstraints(NSLayoutConstraint.constraints(withVisualFormat: "V:|[v0]|", options: NSLayoutFormatOptions(), metrics: nil, views: ["v0": resultsLabel]))

        let names = ["Ross", "Joey", "Chandler", "Monica", "Rachel", "Phoebe"]

        **var score = 0
        for question in questionsList {
            score += question.selectedAnswerIndex!**
        }

        let result = names[score % names.count]
        resultsLabel.text = "Congratulations, you'd make a great \(result)!"
    }

Answer 1

用 static 关键字这样声明

class QuestionController: UITableViewController {
 static  let questionsList: [Question] = [Question(questionString: "What is your favorite type of food?", answers: ["Sandwiches", "Pizza", "Seafood", "Unagi"], selectedAnswerIndex: nil), Question(questionString: "What do you do for a living?", answers: ["Paleontologist", "Actor", "Chef", "Waitress"], selectedAnswerIndex: nil), Question(questionString: "Were you on a break?", answers: ["Yes", "No"], selectedAnswerIndex: nil)]

访问使用

QuestionController.questionsList

Answer 2

如果问题是硬编码的，请将它们移动到 Question 结构中，如 class 属性

struct Question {
    let questionString: String
    let answers: [String]
    var selectedAnswerIndex: Int?

    static let questionsList : [Question] = [Question(questionString: "What is your favorite type of food?", answers: ["Sandwiches", "Pizza", "Seafood", "Unagi"], selectedAnswerIndex: nil), Question(questionString: "What do you do for a living?", answers: ["Paleontologist", "Actor", "Chef", "Waitress"], selectedAnswerIndex: nil), Question(questionString: "Were you on a break?", answers: ["Yes", "No"], selectedAnswerIndex: nil)]

}

并从任何地方调用它

Question.questionsList

使用未解析的标识符“questionList”

Use of unresolved identifier 'questionList"

var

identifier

undeclared-identifier

swift