SwiftUI webview 未使用@State 变量更新

Question

出于某种原因，我用来更新 WebView url 的 @State 变量没有更新。这两个按钮都会导致 'www.target.com' url.

import SwiftUI

struct ContentView: View {
    var siteArray = ["http://www.google.com","http://www.yahoo.com","http://www.amazon.com"]
    @State private var siteUrl = "http://www.target.com"
    @State private var showWebView = false
    
    var body: some View {
        ScrollView{
            Text("Websites")
            Button("Target") {
                showWebView.toggle()
            }
            Button("Google") {
                siteUrl = siteArray[0]
                showWebView.toggle()
            }
        }
        .sheet(isPresented: $showWebView) {
                                                
        WebView(url: URL(string: "\(siteUrl)")!)
                                            }
}
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

如有任何帮助，我们将不胜感激。谢谢！

Answer 1

尝试使用@Binding 例如：

struct WebView: View {
@Binding var siteUrl :String
var body: some View {
    Text(siteUrl)
}
}

struct ContentView: View {
var siteArray =    ["http://www.google.com","http://www.yahoo.com","http://www.amazon.com"]
@State private var siteUrl = "http://www.target.com"
@State private var showWebView = false

var body: some View {
    ScrollView{
        Text("Websites")
        Button("Target") {
            showWebView.toggle()
        }
        Button("Google") {
            siteUrl = siteArray[1]
            showWebView.toggle()
        }
    }
    .sheet(isPresented: $showWebView) {
        WebView(siteUrl: $siteUrl)
        
    }
}
}

SwiftUI webview 未使用@State 变量更新

SwiftUI webview not updating with @State variable

swift

wkwebview

swiftui