SwiftUI 基礎之05 list 和 searchbar (2020)

首要

struct ContentView: 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"))
        }
    }
}

searchbar

import SwiftUI

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
    }
}

效果圖

image.png

參考資料

• https://medium.com/better-programming/implement-searchbar-in-swiftui-556a204e1970