Xcode – How to call API again after change was made?

So I want to search books from google books api, but only through url query, how can I call API again when I enter the text in the search bar? How to reload the call?

I tried also with textfield onSumbit method, but nothing work.

I just want to insert value of textSearch to network.searchText and that network.searchText to insert into q=

here is my code of ContentView:

//
//  ContentView.swift
//  BookApi
//
//  Created by Luka Šalipur on 7.6.22..
//

import SwiftUI

struct URLImage: View{
    var urlString: String
    @State var data: Data?

    
    var body: some View{
        if let data = data, let uiimage = UIImage(data:data) {
            Image(uiImage: uiimage)
                .resizable()
                .aspectRatio(contentMode: .fit)
                .frame(width:80, height:120)
                .background(Color.gray)
        } else {
            Image(systemName: "book").onAppear {
                fetch()
            }
        }
    }
    
    private func fetch(){
        guard let url = URL(string: urlString) else {
            return
        }
                
                let task = URLSession.shared.dataTask(with:url) { data, _, error in
                    self.data = data
                }
        
        task.resume()
    }

}

// ContentView

struct ContentView: View {
    @ObservedObject var network = Network()
    @State var textSearch:String = "knjiga"
    @State private var shouldReload: Bool = false
    
    func context(){
        network.searchText = self.textSearch
        print(network.searchText)
    }

    var body: some View {
        
        NavigationView{
              
            List{
      
            ForEach(network.book, id:.self){ item in
                NavigationLink{
                    Webview(url: URL(string: "(item.volumeInfo.previewLink)")!)
                } label: {
                    
                
                HStack{
                    URLImage(urlString: item.volumeInfo.imageLinks.thumbnail)
                    Text("(item.volumeInfo.title)")
               
                }
                }
            }
                
            }
            .onAppear{
                context()
            }
            .onChange(of: textSearch, perform: { value in
                self.shouldReload.toggle()
            })
            .searchable(text: $textSearch)

            .navigationTitle("Books")
                .task{
                    await network.loadData()
                }
             
          
  
            
               
        }
        

    }

}

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

And here is my API(network) call:

//
//  Network.swift
//  BookApi
//
//  Created by Luka Šalipur on 7.6.22..
//

import Foundation
import SwiftUI



class Network: ObservableObject{
    @Published var book = [Items]()
    
    var searchText: String = "watermelon" {
        willSet(newValue) {
            print(newValue)
        }
    }
    
    
    func loadData() async {
        
        guard let url = URL(string: "https://www.googleapis.com/books/v1/volumes?q=(searchText)&key=API_KEY_PRIVATE") else {
            return
        }
                
        
                    do {
                        let (data, _) = try await URLSession.shared.data(from: url)
                        if let decodedResponse = try? JSONDecoder().decode(Books.self, from: data) {
                           book = decodedResponse.items
                        }
                   
                    } catch {
                        print("There is an error")
                    
                    }
                }
        

    }