Question

我是IOS和SwiftUI编码的新手。我用谷歌搜索了很多，但是找不到解决方案，如何将计算变量传递给下一个视图。以下是我所拥有的片段：

import SwiftUI

struct ContentView: View {

@State private var isShowingResultView = false

@State private var netRate = "0"
@State var daysMonth = "0"
@State var hoursWeek: String = "0"
@State var daysOnsite: String = "0"
@State var ticketCost: String = "0"
@State var hotelCost: String = "0"
@State var otherCost: String = "0"
//@State var travellCostResult: Double = 0.00

var travellCostPerHour: Double{
    get {
        let daysMonthNbr = Int(daysMonth) ?? 0
        let hoursWeekNbr = Int(hoursWeek) ?? 0
        let daysOnsiteNbr = Int(daysOnsite) ?? 0
        let ticketCostNbr = Double(ticketCost) ?? 0
        let hotelCostNbr = Double(hotelCost) ?? 0
        let otherCostNbr = Double(otherCost) ?? 0

        let travellCostPerWeek = (ticketCostNbr + (Double((daysOnsiteNbr-1))*hotelCostNbr)+otherCostNbr)
        
        let travellCostPerHour: Double = Double(travellCostPerWeek) / Double(hoursWeekNbr)
        
        return travellCostPerHour.isNaN ? 0 : travellCostPerHour
    }
}
.
.
.

var body: some View {
              HStack {
                    NavigationLink("Calculate", destination: ResultView(netRate: self.$netRate, travellCostPerHour: travellCostPerHour), isActive: $isShowingResultView).navigationBarTitle("Result").buttonStyle(GradientButtonStyle())
                    .adaptToKeyboard()
                }

struct ResultView: View {

@Binding var netRate: String
@Binding var travellCostPerHour: Double
.
.
.

struct ResultView_Previews: PreviewProvider {

   @State static var netRate: String = ""
   @State static var travellCostPerHour: Double = 0.00

   static var previews: some View {
      ResultView(netRate: $netRate, travellCostPerHour: $travellCostPerHour )
   }
}

我在travellCostPerHour的navigationLink中收到此错误消息：无法将类型“ Double”的值转换为预期的参数类型“ Binding” 一个人可以把我放在正确的道路上吗？

Answer 1

如果是计算属性，则不需要绑定，请按原样传递

struct ResultView: View {

@Binding var netRate: String
var travellCostPerHour: Double      // << just regular

// .. other code

SwiftUI将计算变量传递给下一个视图

1 个答案: