2021-07-31

一、首先看一下iOS15之前的搜索框

搜索框需要自己写 功能等方面也需要自己实现

struct NewSearch: View {
    let names = ["Raju", "Ghanshyam", "Baburao Ganpatrao Apte", "Anuradha", "Kabira", "Chaman Jhinga", "Devi Prasad", "Khadak Singh"]
    
    @State private var searchTerm : String = ""
    
    var body: some View {

        NavigationView{
            List {
                SearchBar(text: $searchTerm)
                ForEach(self.names.filter{
                    self.searchTerm.isEmpty ? true : $0.localizedStandardContains(self.searchTerm)
                }, id: \.self) { name in
                    Text(name)
                }
            }
            .navigationBarTitle(Text("Search Bar"))
        }
    }
}

struct SearchBar : UIViewRepresentable {
    
    @Binding var text : String
    
    class Cordinator : NSObject, UISearchBarDelegate {
        
        @Binding var text : String
        
        init(text : Binding<String>) {
            _text = text
        }
        
        func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {
            text = searchText
        }
    }
    
    func makeCoordinator() -> SearchBar.Cordinator {
        return Cordinator(text: $text)
    }
    
    func makeUIView(context: UIViewRepresentableContext<SearchBar>) -> UISearchBar {
        let searchBar = UISearchBar(frame: .zero)
        searchBar.delegate = context.coordinator
        return searchBar
    }
    
    func updateUIView(_ uiView: UISearchBar, context: UIViewRepresentableContext<SearchBar>) {
        uiView.text = text
    }
}

image.png

二、iOS15新增

struct ContentView: View {
    let names = ["Holly", "Josh", "Rhonda", "Ted"]
    @State private var searchText = ""

    var body: some View {
        
        NavigationView {
            List {
                ForEach(searchResults, id: \.self) { name in
                    NavigationLink(destination: Text(name)) {
                        Text(name)
                    }
                }
            }
            .searchable(text: $searchText) {
                ForEach(searchResults, id: \.self) { result in
                    Text("Are you looking for \(result)?").searchCompletion(result)
                }
            }
            .navigationTitle("Contacts")
        }
    }

    var searchResults: [String] {
        if searchText.isEmpty {
            return names
        } else {
            return names.filter { $0.contains(searchText) }
        }
    }
}

searchable 只能在导航控制器中使用，通过绑定的字符串可直接实现搜索

image.png
在未实现搜索建议的时候，进行的是模糊搜索

            .searchable(text: $searchText, prompt: "搜索", suggestions: {
                ForEach(searchResults, id: \.self) { result in
                    Text("Are you looking for \(result)?").searchCompletion(result)
                }
            })

实现搜索建议 点击可以搜索某一项

image.png

三、注意事项

iOS15新增的searchable 只能在 NavigationView 中使用