如何在 swiftui 中实现 struct View 上的 var 类 ObservableObject

Posted 2023-02-24

【中文标题】如何在 swiftui 中实现 struct View 上的 var 类 ObservableObject

【英文标题】：How to implement var on struct View to class ObservableObject in swiftui

【发布时间】：2020-04-06 07:17:51

【问题描述】：

我无法将 struct View 上的 var 实现为 swiftui 中的 ObservableObject 类

struct History: View 

var busId : String

@ObservedObject var historyData = getHistory()

var body: some View 
    ZStack
        ScrollView(.vertical, showsIndicators: false)
            VStack(alignment: .leading)

                ForEach(historyDataSatu.data)i in
                      Text("Something")
                

            

        
    


class getHistory: ObservableObject 

    @Published var data = [history]()

    init() 

        let db = Firestore.firestore().collection("Bus").document(busId)
        // An error occurs when I implement busId into document(busId). Please help me.

    


   


struct history: Identifiable 
    var id : String
    var day : String

【参考方案1】：

您可以在 init 方法中启动您的 ObservedObject 对象 historyData，例如。希望对你有帮助

struct History: View 

    var busId : String
    @ObservedObject var historyData = getHistory(busId: "")

    init() 
       self.historyData = getHistory(busId: busId)
    

    var body: some View 
        ZStack
            ScrollView(.vertical, showsIndicators: false)
                VStack(alignment: .leading)
                    ForEach(historyData.data)  i in
                       Text("Something")
                    
                
            
        
    


class getHistory: ObservableObject 

    @Published var data = [history]()
    init(busId: String) 
        let db = Firestore.firestore().collection("Bus").document(busId)