ios - 通过 segue 在 View Controller 之间传递数据

Question

我有一个 MapViewController 和一个 prepareForSegue(_:sender:) 方法，我打算用它发送数据到 LandmarkTableViewController，并在按下按钮时调用。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        let destinationvc = segue.destinationViewController
        if let landmarkvc = destinationvc as? LandmarkTableViewController {
            if let identifier = segue.identifier {

                let library = Landmark(name: "Run Run Shaw Library", properties: ["Chinese Kanji", "Gray", "Green Plants"])

                let bank = Landmark(name: "Hang Seng Bank", properties: ["Chinese Kanji", "Green"])

                switch identifier {
                    case "showLibrary" : landmarkvc.passedLandmark = library // pass data to LandmarkTableViewController
                    case "showBank" : landmarkvc.passedLandmark = bank // pass data to LandmarkTableViewController
                    default : break
                }
            }
        }
    }

LandmarkTableViewController 已正确设置为显示字符串数组 properties，每行有一个字符串。所以我打算做的是根据按下哪个按钮将表格的适当数据传递给properties，并让LandmarkTableViewController显示相应的properties.

class LandmarkTableViewController: UITableViewController {
    var properties = [String]()
    var passedLandmark = Landmark(name: "temp", properties: ["temp"]) // initially set to default value

    override func viewDidLoad() {
        super.viewDidLoad()

        loadSampleProperties()
    }

    func loadSampleProperties() {
        self.properties = passedLandmark!.properties
    }
    // other methods....
}

class Landmark {
    var name: String
    var properties: [String]

    init?(name: String, properties: [String]) {
        self.name = name
        self.properties = properties

        // Initialization should fail if there is no name or if there is no property.
        if name.isEmpty || properties.isEmpty {
            return nil
        }
    }

但是，当我运行代码时，表格 View 中只显示临时文件。我已经坚持了很长时间，所以非常感谢任何帮助!

编辑:将 viewDidLoad() 中的 loadData() 更改为正确的 loadSampleProperties()。我在将代码发布到问题时出错。

Answer 1

如果不仔细检查您的标识符，我认为这应该可以解决您的问题并且您可以通过将 print(passedLandmark) 添加到 viewDidLoad() 或断点来确保数据传递以确保您获得数据

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?)        {
    let destinationvc = segue.destinationViewController
    if let landmarkvc = destinationvc as? LandmarkTableViewController {
        if segue.identifier == "showLibrary" {

            let library = Landmark(name: "Run Run Shaw Library", properties: ["Chinese Kanji", "Gray", "Green Plants"])
              landmarkvc.passedLandmark = library
        }
        if segue.identifier == "showBank" {
            let bank = Landmark(name: "Hang Seng Bank", properties: ["Chinese Kanji", "Green"])
            landmarkvc.passedLandmark = bank
        }
    }
}

希望对你有帮助