快速在 PageViewControllers 中传递数据

Question

我有一个页面控制器，我在其中添加了 UIViewControllers 并在每个视图控制器中显示一堆表单。我现在面临的问题是我需要获取每个表单中提供的数据并保存它，这是在最后一个视图控制器中完成的。我曾尝试使用委托，但在单击下一个按钮的那一刻，之前存储的值变为nil，并且只显示最新的VC 的值。如何在此文本字段中传递数据。如有任何帮助，将不胜感激。

我的代表

protocol NextDelegate: AnyObject {
    func next(pageIndex: Int, model: CreatePropertyModel)
    func previous(pageIndex: Int, model: CreatePropertyModel)
}

我如何创建 VC 数组

lazy var controllers: [UIViewController] = {
        let descVC = DescVC()
        descVC.delegate = self
        let priceVC = PriceVC()
        priceVC.delegate = self
        let featuresVC = FeaturesVC()
        featuresVC.delegate = self
        let picturesVC = PicturesVC()
        picturesVC.delegate = self
        return [descVC, priceVC, featuresVC, picturesVC]
    }()

模型示例

class CreatePropertyModel: DictionaryEncodable {
    var title: String?
    var desc: String?
    var property_type_id: Int?
    var property_sub_type_id: Int?
    var location_id: Int?
    var currency: String?
    var price: Int?
}

Answer 1

对于所有步骤，将其存储在单例中。

protocol Answer {
    var isDone: Bool { get }
}

class Answer1: Answer {
    static public let updatedNotification = Notification.Name("Answer1Updated")

    var name: String? {
        didSet {
            NotificationCenter.default.post(name: Answer1.updatedNotification, object: nil)
        }
    }

    var isDone: Bool {
        return name != nil
    }
}

class Answer2: Answer {
    var age: Int?

    var isDone: Bool {
        return age != nil
    }
}

class Form {
    static let shared = Form()

    var answers: [Answer] = [Answer1(), Answer2()]

    var isDone: Bool {
        return answers.allSatisfy { $0.isDone == true }
    }

    private init() {}

    func reset() {
        answers = [Answer1(), Answer2()]
    }

    var answer1: Answer1? {
        return Form.shared.answers.filter { $0 is Answer1 }.first as? Answer1
    }

    var answer2: Answer2? {
        return Form.shared.answers.filter { $0 is Answer2 }.first as? Answer2
    }
}

然后，在您的视图控制器中，像这样读取/写入值。

class MyViewControllerForAnswer1: UIViewController {
    var answer: Answer1? {
        return Form.shared.answer1
    }

    var name: String? {
        get {
            return answer?.name
        }
        set {
            answer?.name = newValue
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(answerUpdated(notification:)), name: Answer1.updatedNotification, object: nil)

    }

    @objc func answerUpdated(notification: Notification) {
        // Update your content
    }
}