swift - 分配与 UIPickerView 上显示的不同的输出值

Question

昨天我一直在这个网站上搜索这个问题的答案，但我没能找到这个。我是一名业余编码员，实际上只是为一家小型组织做这件事，看看我们是否可以帮助改进流程。

这是我正在尝试做的。我正在尝试制作一个应用程序，允许某人选择一个帐号、一项任务，然后它会输出一个完整帐号的数字，他们可以将其放在收据上。

例如，某人选择帐号12345678910，他们选择“打扫卫生”。我希望该应用吐出一个完整的帐号，例如 12345678910 58392，其中 58932 与“清洁浴室”相关联，但实际上并未显示在 PickerView 上。我在这方面遇到了麻烦。编码是我一直想学的东西，但一直在业余时间做，所以如果有错误，请原谅业余爱好。为此，我一直在使用 YouTube 视频。

感谢任何帮助。非常感谢! Sample app screen-shot

import UIKit

class Account {
    var account: String
    var jlCode: [String]

    init(account:String, jlCode:[String]) {
        self.jlCode = jlCode
        self.account = account
    }
}

class ViewController: UIViewController, UIPickerViewDelegate, UIPickerViewDataSource {

    @IBOutlet weak var pickerView: UIPickerView!
    @IBOutlet weak var accountLbl: UILabel!

    var accounts = [Account]()

    @IBAction func showPopup(_ sender: Any) {
        let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "sbPopUpID") as! PopUpViewController
        self.addChildViewController(popOverVC)

        popOverVC.view.frame = self.view.frame
        self.view.addSubview(popOverVC.view)

        popOverVC.didMove(toParentViewController: self)
    }

    override func viewDidLoad() {

        pickerView.delegate = self
        pickerView.dataSource = self

        //This area will have to be changed once you get the right information.

        accounts.append(Account(account: "12345678910", jlCode: ["task 1", "task 2", "task 3", "task 4"]))
        accounts.append(Account(account: "1112131415", jlCode: ["Task 1"]))
        accounts.append(Account(account: "1617181920", jlCode: ["task 1", "task 2", "task 3", "task 4"]))
        accounts.append(Account(account: "2122232425", jlCode: ["task 1", "task 2", "task 3", "task 4"]))

        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 2
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        if component == 0 {
            return accounts.count
        } else {
            let selectedAccount = pickerView.selectedRow(inComponent: 0)
            return accounts[selectedAccount].jlCode.count
        }
    }

    func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
        if component == 0 {
            return accounts[row].account
        } else {
            let selectedAccount = pickerView.selectedRow(inComponent: 0)
            return accounts[selectedAccount].jlCode[row]
        }
    }

    func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
        pickerView.reloadComponent(1)

        let selectedAccount = pickerView.selectedRow(inComponent: 0)
        let selectedjlCode = pickerView.selectedRow(inComponent: 1)
        let account = accounts[selectedAccount].account
        let jlCode = accounts[selectedAccount].jlCode[selectedjlCode]

        accountLbl.text = "Account Number: \(account)\nJL Code: \(jlCode)"
    }
}

Answer 1

如果，那是一个很大的IF，我理解正确你的问题是你没有将任务的描述与与任务。换句话说，您似乎只是在为数据建模而苦苦挣扎。

我认为类似下面的内容可能会帮助您朝着正确的方向前进:

struct Account {
    var number: Int
    var tasks: [Task]

    var description: String { return "\(number)" }
}

struct Task {
    var number: Int // or JLNumber, or whatever you want to call it
    var description: String
}

这会让您像这样设置帐户:

let account = Account(number: 12345678910, tasks: [Task(number: 58932, description: "Cleaning the bathroom")])

您将在 pickerView 中显示 .description，并在任何有意义的地方使用 .number。

如果任务的不同类型是预定义的，(即它们永远不会在代码不改变的情况下改变)你应该看看enums 而不是使用字符串和整数动态创建它们......