Question

我是Xcode编程的新手，在处理Dictionary UISplitViewController项目时遇到此错误。我制作了一个“ Word”类和一个函数，但是当我尝试在AppDelegate.swift中组装它们时，出现以下错误：“类型'DetailViewController'的值没有成员'word'“。

每个插座已经在Main.Storyboard的Detail View Controller中正确链接到其每个标签。

//"Word" class

class Word {
let name: String
let meaning: String
let numberOfTimesTapped: String

init(name: String, meaning: String, numberOfTimesTapped: String) {
    self.name = name
    self.meaning = meaning
    self.numberOfTimesTapped = numberOfTimesTapped
    }
}

//"words" function in the DetailViewController.swift

import UIKit

let words = [
Word(name: "Home", meaning: "A place where one lives", numberOfTimesTapped: "5"),
Word(name: "Place", meaning: "A particular position, point, or area in space; a location.", numberOfTimesTapped: "3"),
Word(name: "Like", meaning: "Having the same characteristics or qualities as; similar to.", numberOfTimesTapped: "1")
]


class DetailViewController: UIViewController {

class Word {
    let name: String
    let meaning: String
    let numberOfTimesTapped: String

    init(name: String, meaning: String, numberOfTimesTapped: String) {
        self.name = name
        self.meaning = meaning
        self.numberOfTimesTapped = numberOfTimesTapped
    }

}

@IBOutlet weak var WordLabel: UILabel!
@IBOutlet weak var DescriptionLabel: UILabel!
@IBOutlet weak var NumberOfTimesTappedLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    var word: Word? {
        didSet {
            refreshUI()

        }
    }

    func refreshUI() {
        loadViewIfNeeded()
        WordLabel.text = word?.name
        DescriptionLabel.text = word?.meaning
        NumberOfTimesTappedLabel.text = word?.numberOfTimesTapped
    }

//Content inside of MasterViewController.swift
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?


func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
            guard let splitViewController = window?.rootViewController as? UISplitViewController,
                let leftNavController =  splitViewController.viewControllers.first as? UINavigationController,
                let masterViewController = leftNavController.topViewController as? MasterViewController,
                let detailViewController = splitViewController.viewControllers.last as? DetailViewController
                else { fatalError() }

            let firstWord = masterViewController.words.first
            detailViewController.word = firstWord //THIS IS WHERE I GET THE ERROR "Value of type 'DetailViewController' has no member 'word'"

            return true
}

Answer 1

您的变量不可见，因为它位于方法viewDidLoad内，这使其仅在viewDidLoad范围内可见。

我想您需要将它作为控制器的属性放在类范围内，因此只需将其与方法refreshUI()一起从方法移到类范围

class DetailViewController: UIViewController {

    var word: Word? {
        didSet { refreshUI() }
    }

    func refreshUI() {
        ...
    }

}

类型'DetailViewController'的值没有成员'word'

1 个答案: