在 SwiftUI 中向 NavigationView 添加搜索栏
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【中文标题】在 SwiftUI 中向 NavigationView 添加搜索栏【英文标题】:Adding a search bar to NavigationView in SwiftUI 【发布时间】:2020-01-13 03:07:29 【问题描述】:我正在使用 SwiftUI 创建一个项目,并希望在导航栏中添加一个搜索栏,就像原生设置应用程序、邮件应用程序等中存在的那样。
我尝试了一些方法,但无法完全发挥作用。以下代码运行良好,但即使包含navigationController.navigationItem.hidesSearchBarWhenScrolling = false
,搜索栏也不会显示(我尝试向上滚动)。任何帮助将不胜感激。
//
// ContentView.swift
// SwiftUITest
//
// Created by me on 1/7/20.
// Copyright © 2020 me. All rights reserved.
//
import SwiftUI
struct HomeView: View
var body: some View
ScrollView
HStack
Spacer(minLength: 0)
Text("Hello World")
Spacer(minLength: 0)
.navigationBarTitle(Text("Search"))
struct SecondView: View
var body: some View
return Text("Second View")
struct CustomUIViewControllerRepresentation: UIViewControllerRepresentable
typealias UIViewControllerType = UINavigationController
func makeUIViewController(context: Context) -> UINavigationController
let viewController = UIHostingController(rootView: HomeView())
let navigationController = UINavigationController(rootViewController: viewController)
navigationController.navigationBar.prefersLargeTitles = true
let searchController = UISearchController()
navigationController.navigationItem.searchController = searchController
return navigationController
func updateUIViewController(_ uiViewController: UINavigationController, context: Context)
struct ContentView: View
var body: some View
CustomUIViewControllerRepresentation()
【问题讨论】:
【参考方案1】:(编辑)ios 15:
iOS 15 添加了新属性.searchable()
。您可能应该改用它。
原文:
如果有人还在寻找,我发了a package 来解决这个问题,因为我找到的所有其他解决方案都有一些问题。
我还在这里为那些不喜欢链接或只想复制/粘贴的人提供完整的相关源代码。
扩展名:
// Copyright © 2020 thislooksfun
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the “Software”), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
import SwiftUI
import Combine
public extension View
public func navigationBarSearch(_ searchText: Binding<String>) -> some View
return overlay(SearchBar(text: searchText).frame(width: 0, height: 0))
fileprivate struct SearchBar: UIViewControllerRepresentable
@Binding
var text: String
init(text: Binding<String>)
self._text = text
func makeUIViewController(context: Context) -> SearchBarWrapperController
return SearchBarWrapperController()
func updateUIViewController(_ controller: SearchBarWrapperController, context: Context)
controller.searchController = context.coordinator.searchController
func makeCoordinator() -> Coordinator
return Coordinator(text: $text)
class Coordinator: NSObject, UISearchResultsUpdating
@Binding
var text: String
let searchController: UISearchController
private var subscription: AnyCancellable?
init(text: Binding<String>)
self._text = text
self.searchController = UISearchController(searchResultsController: nil)
super.init()
searchController.searchResultsUpdater = self
searchController.hidesNavigationBarDuringPresentation = true
searchController.obscuresBackgroundDuringPresentation = false
self.searchController.searchBar.text = self.text
self.subscription = self.text.publisher.sink _ in
self.searchController.searchBar.text = self.text
deinit
self.subscription?.cancel()
func updateSearchResults(for searchController: UISearchController)
guard let text = searchController.searchBar.text else return
self.text = text
class SearchBarWrapperController: UIViewController
var searchController: UISearchController?
didSet
self.parent?.navigationItem.searchController = searchController
override func viewWillAppear(_ animated: Bool)
self.parent?.navigationItem.searchController = searchController
override func viewDidAppear(_ animated: Bool)
self.parent?.navigationItem.searchController = searchController
用法:
import SwiftlySearch
struct MRE: View
let items: [String]
@State
var searchText = ""
var body: some View
NavigationView
List(items.filter $0.localizedStandardContains(searchText) ) item in
Text(item)
.navigationBarSearch(self.$searchText)
【讨论】:
【参考方案2】:试试这个:
-> 缺少这一行:viewController.navigationItem.searchController = searchController
func makeUIViewController(context: Context) -> UINavigationController
let viewController = UIHostingController(rootView: HomeView())
let navigationController = UINavigationController(rootViewController: viewController)
navigationController.navigationBar.prefersLargeTitles = true
let searchController = UISearchController()
navigationController.navigationItem.searchController = searchController
viewController.navigationItem.searchController = searchController
return navigationController
【讨论】:
@RedaLemeden 当您从搜索者读取值时,您可以分享完整的解决方案吗? @PawełMadej 从那以后我放弃了这个解决方案。我发现了其他我现在不记得的问题。以上是关于在 SwiftUI 中向 NavigationView 添加搜索栏的主要内容,如果未能解决你的问题,请参考以下文章
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