SwiftUI NavigationLink 变灰

问题描述

为我的应用程序实现搜索功能后，我希望搜索结果可点击。 因此，我将搜索结果嵌入到导航链接中，但有一些问题。 当我尝试搜索对象时，搜索结果变灰且导航链接不可点击。

通常看起来像这样（我知道，每个人都知道）

我在 NavigationSearch() 下截取的代码中实现了搜索结果

要重现此错误： 从他的 NavigationSearch

中使用 Mark van Wijnen 的 Medium article

这个类：

import SwiftUI

struct TracksView2: View {
    
    var tracks: [Track] = tracksData
    @State private var searchText: String = ""
    var filtered : [Track] {
        if searchText.isEmpty {
            return tracks
        } else {
            return tracks.filter({ $0.search(searchText) })
        }
    }
    
        var body: some View {
        NavigationView {
            NavigationSearch(text: $searchText,searchResultsContent: {
                ForEach(filtered,id: \.id) { track in
                    NavigationLink(destination: TrackDetailView(tracks: track)) {
                        TrackRowView(track: track)
                    }
                }
            })
        } //: NAVIGATION
        
    }
}

（并用 EmptyView 替换 TrackDetailView）

像这样创建一个数据模型：

import SwiftUI

struct Track: Identifiable {
  var id = UUID()
  var title: String
  var headline: String
  var image: String
  var imagebig: String
  var gradientColors: [Color]
  var link: String
  var description: String
  var details: [String]
    
    func search(_ query: String) -> Bool {
        let searchable = [title,headline,description] + details

        return searchable.filter({ $0.contains(query) }).count > 0
    }
}

并使用此示例数据：

import SwiftUI

let tracksData: [Track] = [
  Track(
      title: "Spa-Francorchamps",headline: "Die Ardennenachterbahn ist für viele die faszinierenste Rennstrecke überhaupt. ",image: "road",imagebig: "preview",gradientColors: [Color("ColorBlueBerryLight"),Color("ColorBlueBerryDark")],link: "https://www.wikipedia.de/",description: """
                Bis
        """,details: ["7004m","8,50-18,50m","21","100m"]
    ),

提前致谢:)

解决方法

这是封装在 UIViewRepresentable 中的 UISearchBar，归功于 Tim W Swift UI Contacts。我已经使用它并且它有效。也许试一试？

struct SearchBar: UIViewRepresentable {
    @Binding var text: String
    var placeholder: String?
    
    class Coordinator: NSObject,UISearchBarDelegate {
        
        @Binding var text: String
        
        init(text: Binding<String>) {
            _text = text
        }
        
        func searchBar(_ searchBar: UISearchBar,textDidChange searchText: String) {
            text = searchText
        }
    }
    
    func makeCoordinator() -> SearchBar.Coordinator {
        return Coordinator(text: $text)
    }
    
    func makeUIView(context: UIViewRepresentableContext<SearchBar>) -> UISearchBar {
        let searchBar = UISearchBar(frame: .zero)
        searchBar.delegate = context.coordinator
        
        searchBar.autocapitalizationType = .none // --> here,we make some adjustments to the view so it better fits to our app
        searchBar.searchBarStyle = .minimal
        searchBar.placeholder = placeholder
        
        return searchBar
    }
    
    func updateUIView(_ uiView: UISearchBar,context: UIViewRepresentableContext<SearchBar>) {
        uiView.text = text
    }
}