Question

我有此代码：

struct CreateInfo: Identifiable {
    var id: String
    var name: String
    var time: String
    var day: String
    var isDeleted: Bool
}

struct ZettelView: View {
    
    @State var zettelInfos = [CreateInfo]()
    
    @State private var showingAlert = false

    @State private var savedValueForDeleteFunction: CreateInfo
    
    func createNewInfo() {
        
        var arr = [[String]]()
        arr = getZettelData()
                
        
        for x in arr {
            zettelInfos.append(CreateInfo(id: "\(x[0])", name: "\(x[1])", time: "\(x[2])", day: "\(x[3])", isDeleted: false))
        }
        
        self.executeThisAsyncThing = false
        
   }
    
    
    @State var executeThisAsyncThing: Bool = true
    
    
    
    var body: some View {
    
        
        DispatchQueue.main.async {
            if self.executeThisAsyncThing {
                self.createNewInfo()
            }
        }
            
        
        return VStack {
            
            //New - testing
            NavigationView {
                List {
                    ForEach(zettelInfos) { x in
                                                
                        
                        NavigationLink(destination: zettelDetailView(uuid: x.id, info: x)) {
                            Text("\(x.id)")
                            
                        }

                        
                    }.onDelete(perform: delete)
                    
                }.navigationBarTitle("Einkaufszettel")
                .navigationBarItems(trailing: Button(action: {
                    self.addRow()
                }) {
                    Image(systemName: "plus.app.fill")
                })
                
            }

         .alert(isPresented: $showingAlert) {
                Alert(title: Text(" meImportantssage"), message: Text("Wear sunscreen"), dismissButton: .default(Text("Got it!")))
            }
            
            
            
        }

        
    }
    
    func delete(at offsets: IndexSet) {
                
        zettelInfos.remove(atOffsets: offsets)
        self.showingAlert = true
                
    }
    
    
        private func addRow() {
            
            let dateAndTime = Date()
            let dfDay = DateFormatter()
            let dfTime = DateFormatter()
            
            dfDay.dateFormat = "dd.MM.yyyy"
            dfTime.dateFormat = "HH:mm:ss"

            let day = dfDay.string(from: dateAndTime)
            let time = dfTime.string(from: dateAndTime)
            
            
            let x = CreateInfo(id: UUID().uuidString, name: "Neuer Zettel", time: time, day: day, isDeleted: false)
            
            saveZettelData(x: x)
            zettelInfos.append(x)
            

        }
    


}

所以我的问题是，如何将ForEach中的x变量解析为删除函数？

我为什么要这个？ -> foreach中的x变量有一个UUID，我需要x

中的UUID

你们中有人知道一种如何从x获取UUID的方法吗？

这是我的第一个快速应用程序，我正在尝试学习它，但是在某些情况下，它的方式与我所知道的其他语言不同。通常，我会将一个值解析为一个删除函数，然后遍历它以查找和删除特定的行/数据，但是我想这是另一种快速的方法。

Answer 1

这里是拥有它的一种方式

func delete(at offsets: IndexSet) {
            
    let index = offsets[offsets.startIndex]
    let x = zettelInfos[index]

    // ... do anything needed with x.id now

    zettelInfos.remove(atOffsets: offsets)
    self.showingAlert = true
}

SwiftUI .onDelete从ForEach获取var

1 个答案: