0

我有显示网站的基本应用程序，当我按下按钮时，它应该将我发送到另一个链接，但它不知道为什么我尝试使用 @state bool 并在按下按钮时更改它但没有使用网站加载但按钮确实不改变网站

内容视图.swift

import SwiftUI
import WebKit
import Foundation

struct ContentView: View {
    @State private var selectedSegment = 0
    @State var websi = "172.20.10.3"
    @State private var websites = ["192.168.8.125", "192.168.8.125/Receipts.php","192.168.8.125/myqr.php"]
    @State private var sssa = ["Home","MyRecipts","MyQr"]
    @State var updater: Bool
    var body: some View {
        HStack {
            NavigationView{
                
                VStack{
                    Button(action: {
                        self.websi = "172.20.10.3/myqe.php"
                        self.updater.toggle()
                    }) {
                        Text(/*@START_MENU_TOKEN@*/"Button"/*@END_MENU_TOKEN@*/)
                    } .pickerStyle(SegmentedPickerStyle());
                   
                              
                               
                                 
                                /* Text("Selected value is: \(websites[selectedSegment])").padding()*/
                      
                  Webview(url: "http://\(websi)")
                    
                }
            }
            .padding(.top, -44.0)

        }
       
    }
    
}



struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView( updater: false)
            .padding(.top, -68.0)
    }
}

Webview.swift

import Foundation
import SwiftUI
import WebKit

struct Webview: UIViewRepresentable {
    var url: String
    func makeUIView(context: Context) -> WKWebView {
        guard let url = URL(string: self.url) else{
            return WKWebView()
        }
        let request = URLRequest(url: url)
        let wkWebView = WKWebView()
        wkWebView.load(request)
        return wkWebView
    }
    
    func updateUIView(_ uiView: WKWebView, context:
        UIViewRepresentableContext<Webview>){
        
    }    
}
4

2 回答 2

0

因为当 websi 更改时您没有调用 WebView，所以它不会做任何事情。您需要在 url 中添加一个 @Binding 标记，以便它知道要更新。然后你可以打电话

WebView(self.$websi)
于 2020-09-17T19:55:36.627 回答
0

这是使用 的可能解决方案@ObservableObject：

struct WebView: UIViewRepresentable {
    @ObservedObject var viewModel: ViewModel

    func makeUIView(context: UIViewRepresentableContext<WebView>) -> WKWebView {
        return WKWebView()
    }

    func updateUIView(_ webView: WKWebView, context: UIViewRepresentableContext<WebView>) {
        if let url = URL(string: viewModel.url) {
            webView.load(URLRequest(url: url))
        }
    }
}

extension WebView {
    class ViewModel: ObservableObject {
        @Published var url: String

        init(url: String) {
            self.url = url
        }
    }
}

struct ContentView: View {
    @State private var currentWebsite = "https://google.com"

    var body: some View {
        VStack {
            Button("Change") {
                self.currentWebsite = "https://apple.com"
            }
            WebView(viewModel: .init(url: currentWebsite))
        }
    }
}
于 2020-09-17T19:01:47.520 回答