将emptyText发送到Service SwiftUI

将emptyText发送到Service SwiftUI,swiftui,uitextfield,combine,Swiftui,Uitextfield,Combine,如果按钮值.isCancel为true,我想将搜索文本中的空文本发送到AuthorService()。这样我的作者搜索结果将被清除 import SwiftUI import Combine struct AuthorSearchBar: View { @StateObject var service = AuthorService() @Binding var isCancel: Bool @State var emptyText = &quo

如果按钮值
.isCancel
为true,我想将
搜索文本中的空文本发送到
AuthorService()
。这样我的作者搜索结果将被清除

import SwiftUI
import Combine

struct AuthorSearchBar: View {
        @StateObject var service = AuthorService()
        @Binding var isCancel: Bool
        @State var emptyText = ""
        var body: some View {
            VStack(spacing: 0) {
               HStack {
                Image(systemName: "magnifyingglass")
                if isCancel == false{
                TextField("Search", text: $service.searchText)
                } else if isCancel {
                    TextField("Search", text: $service.searchText = "") 
            //Cannot assign to property: '$service' is immutable
            //Cannot assign value of type 'String' to type 'Binding<String>'
            //Cannot convert value of type '()' to expected argument type 'Binding<String>'
                }
                .padding()
                .onReceive(Just( self.isCancel ? emptyText : service.searchText), perform: { _ in
                    service.fetchData()
                })
            }
        }
}

好的,我仍然不确定我是否理解流程,但是让我们试试

有一些假设(在评论中提到),方法可能如下(原始代码是不可测试的,所以答案就在这里准备好了-可能是拼写错误,调整由您决定,但想法应该是明确的):

备选:
获取数据不做任何更改,但在这种情况下,不可能将输入的空字符串与取消的空字符串分开(尽管不清楚这是否重要)

HStack{
图像(系统名称:“放大镜”)
TextField(“搜索”,text:$service.searchText)
.padding()
}
.onReceive(Just(service.searchText)){text in
service.fetchData()文件
}
.onReceive(Just(self.isCancel)){在中取消
如果取消{

service.searchText=“”//描述和代码都不清楚。请详细说明一下好吗?编辑了我的问题我在许多其他地方使用fetchData服务函数。大多数地方我甚至都没有查找文本。那么有没有更好的方法将文本推送到fetchData函数内?请参阅使用其他方法更新…实际上是从两个方面应该明确总的方向。
class AuthorService: ObservableObject {
@Published var searchText : String = ""
func fetchData() {
    let parameters = ["index": "authors", "query": "\(searchText)" ]
struct AuthorSearchBar: View {

    @StateObject var service = AuthorService()
    @Binding var isCancel: Bool

    var body: some View {
        VStack(spacing: 0) {
           HStack {
             Image(systemName: "magnifyingglass")
             TextField("Search", text: $service.searchText)
                .padding()
           }
            .onReceive(Just(service.searchText)) { text in
                if !text.isEmpty {  // assuming search only for existed text
                   service.fetchData(for: text)
                }
            }
            .onReceive(Just(self.isCancel)) { canceled in
                if canceled {
                    // assuming needed to send on explicit cancel
                    service.fetchData(for: "")
                }
            }
        }
    }
}

// pass what should be sent via argument instead of use property
func fetchData(for text: String) {
    let parameters = ["index": "authors", "query": "\(text)" ]

    ...
}
   HStack {
     Image(systemName: "magnifyingglass")
     TextField("Search", text: $service.searchText)
        .padding()
   }
    .onReceive(Just(service.searchText)) { text in
        service.fetchData()
    }
    .onReceive(Just(self.isCancel)) { canceled in
        if canceled {
            service.searchText = ""  // << this activates above onReceive
        }
    }