问如何在swiftui的函数中使用用户输入？

EN

class ViewModel: ObservableObject {
    @Published var latitude:String = ""
    @Published var page = 0
}

struct ContentView: View {
    @EnvironmentObject var value1: ViewModel
    
    var body: some View {
        if value1.page == 0{
            VStack{
            TextField("", text: $value1.latitude)
            Button(action:{ value1.page = 1}){
                Text("To next view")
            }.frame(width: 300, height: 100, alignment: .center)
        }
    } else {
        elevationGraph()
    }
}
}

struct getHtml { 
    var url = URL(string: "https://midcdmz.nrel.gov/apps/spa.pl?syear=2020&smonth=1&sday=1&eyear=2020&emonth=1&eday=1&otype=0&step=60&stepunit=1&hr=12&min=0&sec=0&latitude=\(latitude)&longitude=10.757933&timezone=1.0&elev=53&press=835&temp=10&dut1=0.0&deltat=64.797&azmrot=180&slope=0&refract=0.5667&field=0")
    
    func loadData(from url: URL?) -> String {
        guard let url = url else {
            return "nil"
        }

        let html = try! String(contentsOf: url, encoding: String.Encoding.utf8)
        
        return html
        
    }
}



struct elevationFunction: Shape {

var url: URL? //This only works in views, is there a way to do it in shape structs?
    
    let html = getHtml.init().loadData(from: getHtml.init().url)

    private func dbl1() -> Double {
        
        let leftSideOfTheValue = "0:00:00,"
        
        let rightSideOfTheValue = "\(month)/\(day)/\(year),1:00:00,"
        
        guard let leftRange = html.range(of: leftSideOfTheValue) else {
            print("cant find left range")
            return 0
        }
        
        guard let rightRange = html.range(of: rightSideOfTheValue) else {
            print("cant find right range")
            return 0
        }
        
        let rangeOfTheValue = leftRange.upperBound..<rightRange.lowerBound
        
        return Double(html[rangeOfTheValue].dropLast()) ?? 90
    }

    
    
    func path(in rect: CGRect) -> Path {

        var path = Path()
        
        path.move(to: CGPoint(x: 10, y: (125 - (90-dbl1()))))
        path.addLine(to: CGPoint(x: 120, y: (125 - (90-45))))
        path.addLine(to: CGPoint(x: 250, y: (125 - (90-dbl1()))))
    
        var scale = (rect.height / 350) * (9/10)
        var xOffset = (rect.width / 6)
        var yOffset = (rect.height / 2)
        
        return path.applying(CGAffineTransform(scaleX: scale, y: scale)).applying(CGAffineTransform(translationX: xOffset, y: yOffset))
        
        
    }
}

struct elevationGraph: View {
        var body: some View {
            GeometryReader { geometry in 
                ZStack {
                    elevationFunction().stroke(LinearGradient(gradient: Gradient(colors: [Color.yellow, Color.red]), startPoint: .top , endPoint: .bottom), style: StrokeStyle(lineWidth: 6.0)).aspectRatio(contentMode: .fill)
    
                }
            .frame(width: 600, height: 800, alignment: .center)
        }
    }
}