快速在 PageViewControllers 中传递数据

Posted 2023-03-14

【中文标题】快速在 PageViewControllers 中传递数据

【英文标题】：Passing data in PageViewControllers swift

【发布时间】：2019-07-01 14:02:56

【问题描述】：

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?

【参考方案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
    

【讨论】：

Answer1 和 Answer2 是视图控制器吗？

我添加了模型示例

MyViewControllerForAnswer1 是 Answer1 模型的视图控制器

我在 ParentVC 上有一个下一个按钮触发下一个