如何使用 SwiftUI 显示搜索栏 [英] How to display a search bar with SwiftUI
问题描述
新的 SwiftUI 框架似乎没有提供内置的搜索栏组件.我应该使用 UISearchController 并以某种方式包装它,还是应该使用简单的文本字段并根据文本字段输入更新数据?
当前的解决方法是使用 TextField
作为搜索栏.它运行良好,但没有搜索图标
import SwiftUI结构搜索:查看{let array = [John"、Lena"、Steve"、Chris"、Catalina"]@State private var searchText = "";var主体:一些视图{导航视图{列表{TextField("键入您的搜索",文本:$searchText).textFieldStyle(RoundedBorderTextFieldStyle())ForEach(array.filter{$0.hasPrefix(searchText) || searchText == ""}, id:\.self){searchText in文本(搜索文本)}}.navigationBarTitle(文本(搜索"))}}}struct Search_Previews : PreviewProvider {静态 var 预览:一些视图 {搜索()}}
更新到 Xcode 11.1
这里是一个纯 swiftUI 版本,基于
当搜索栏像这样编辑时:
在行动:
The new SwiftUI framework does not seem to provide a built-in search bar component. Should I use a UISearchController and wrap it in some way, or should I use a simple textfield and update the data according to the textfield input?
EDIT: the current workaround is to use a TextField
as a searchBar. It is working very well, but it doesn't have the search icon
import SwiftUI
struct Search : View {
let array = ["John","Lena","Steve","Chris","Catalina"]
@State private var searchText = ""
var body: some View {
NavigationView{
List{
TextField("Type your search",text: $searchText)
.textFieldStyle(RoundedBorderTextFieldStyle())
ForEach(array.filter{$0.hasPrefix(searchText) || searchText == ""}, id:\.self){searchText in
Text(searchText)
}
}
.navigationBarTitle(Text("Search"))
}
}
}
struct Search_Previews : PreviewProvider {
static var previews: some View {
Search()
}
}
updated to work with Xcode 11.1
Here is a pure swiftUI version, based on Antoine Weber's answer to his question above and what I found in this blog and this gist. It incorporates
- a clear button,
- a cancel button,
- resigning keyboard on dragging in the list and
- hiding the navigation view when the search text field is selected.
Resigning the keyboard on drag in the list can be realized using a method on UIApplication window following these answers. For easier handling I created an extension on UIApplication and view modifier for this extension and finally an extension to View:
extension UIApplication {
func endEditing(_ force: Bool) {
self.windows
.filter{$0.isKeyWindow}
.first?
.endEditing(force)
}
}
struct ResignKeyboardOnDragGesture: ViewModifier {
var gesture = DragGesture().onChanged{_ in
UIApplication.shared.endEditing(true)
}
func body(content: Content) -> some View {
content.gesture(gesture)
}
}
extension View {
func resignKeyboardOnDragGesture() -> some View {
return modifier(ResignKeyboardOnDragGesture())
}
}
So the final modifier for resigning the keyboard is just one modifier that has to be placed on the list like this:
List {
ForEach(...) {
//...
}
}
.resignKeyboardOnDragGesture()
The complete swiftUI project code for the search bar with a sample list of names is as follows. You can paste it into ContentView.swift of a new swiftUI project and play with it.
import SwiftUI
struct ContentView: View {
let array = ["Peter", "Paul", "Mary", "Anna-Lena", "George", "John", "Greg", "Thomas", "Robert", "Bernie", "Mike", "Benno", "Hugo", "Miles", "Michael", "Mikel", "Tim", "Tom", "Lottie", "Lorrie", "Barbara"]
@State private var searchText = ""
@State private var showCancelButton: Bool = false
var body: some View {
NavigationView {
VStack {
// Search view
HStack {
HStack {
Image(systemName: "magnifyingglass")
TextField("search", text: $searchText, onEditingChanged: { isEditing in
self.showCancelButton = true
}, onCommit: {
print("onCommit")
}).foregroundColor(.primary)
Button(action: {
self.searchText = ""
}) {
Image(systemName: "xmark.circle.fill").opacity(searchText == "" ? 0 : 1)
}
}
.padding(EdgeInsets(top: 8, leading: 6, bottom: 8, trailing: 6))
.foregroundColor(.secondary)
.background(Color(.secondarySystemBackground))
.cornerRadius(10.0)
if showCancelButton {
Button("Cancel") {
UIApplication.shared.endEditing(true) // this must be placed before the other commands here
self.searchText = ""
self.showCancelButton = false
}
.foregroundColor(Color(.systemBlue))
}
}
.padding(.horizontal)
.navigationBarHidden(showCancelButton) // .animation(.default) // animation does not work properly
List {
// Filtered list of names
ForEach(array.filter{$0.hasPrefix(searchText) || searchText == ""}, id:\.self) {
searchText in Text(searchText)
}
}
.navigationBarTitle(Text("Search"))
.resignKeyboardOnDragGesture()
}
}
}
}
struct ContentView_Previews: PreviewProvider {
static var previews: some View {
Group {
ContentView()
.environment(\.colorScheme, .light)
ContentView()
.environment(\.colorScheme, .dark)
}
}
}
extension UIApplication {
func endEditing(_ force: Bool) {
self.windows
.filter{$0.isKeyWindow}
.first?
.endEditing(force)
}
}
struct ResignKeyboardOnDragGesture: ViewModifier {
var gesture = DragGesture().onChanged{_ in
UIApplication.shared.endEditing(true)
}
func body(content: Content) -> some View {
content.gesture(gesture)
}
}
extension View {
func resignKeyboardOnDragGesture() -> some View {
return modifier(ResignKeyboardOnDragGesture())
}
}
The final result for the search bar, when initially displayed looks like this
and when the search bar is edited like this:
In Action:
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