Í每当我单击 NavLink 时,我都会尝试刷新此列表
NavigationView {
List(feed.items.indices, id:\.self) { i in
NavigationLink(destination: ListFeedItemDetail(idx: i).environmentObject(self.feed)) {
ListFeedItem(item: self.$feed.items[i])
}
}
}
该列表由环境对象内的数组组成。
问题:只有当我切换到另一个选项卡或关闭应用程序时才会刷新
我以前使用过模态视图,它在那里工作。 (我用 .onAppear 做到了)
有任何想法吗?
示例
问题:当您点击列表中的项目并点击切换按钮时,EnvironmentObject 已更改,但此更改仅在我更改选项卡并再次更改回时反射(reflect)
import SwiftUI
import Combine
struct TestView: View {
@State var showSheet: Bool = false
@EnvironmentObject var feed: TestObject
func addObjects() {
var strings = ["one","two","three","four","five","six"]
for s in strings {
var testItem = TestItem(text: s)
self.feed.items.append(testItem)
}
}
var body: some View {
TabView {
NavigationView {
List(feed.items.indices, id:\.self) { i in
NavigationLink(destination: detailView(feed: self._feed, i: i)) {
HStack {
Text(self.feed.items[i].text)
Text("(\(self.feed.items[i].read.description))")
}
}
}
}
.tabItem({ Text("Test") })
.tag(0)
Text("Blank")
.tabItem({ Text("Test") })
.tag(0)
}.onAppear {
self.addObjects()
}
}
}
struct detailView: View {
@EnvironmentObject var feed: TestObject
var i: Int
var body: some View {
VStack {
Text(feed.items[i].text)
Text(feed.items[i].read.description)
Button(action: { self.feed.items[self.i].isRead.toggle() }) {
Text("Toggle read")
}
}
}
}
final class TestItem: ObservableObject {
init(text: String) {
self.text = text
self.isRead = false
}
static func == (lhs: TestItem, rhs: TestItem) -> Bool {
lhs.text < rhs.text
}
var text: String
var isRead: Bool
let willChange = PassthroughSubject<TestItem, Never>()
var read: Bool {
set {
self.isRead = newValue
}
get {
self.isRead
}
}
}
class TestObject: ObservableObject {
var willChange = PassthroughSubject<TestObject, Never>()
@Published var items: [TestItem] = [] {
didSet {
willChange.send(self)
}
}
}
最佳答案
我有一个类似的问题,这是我想出的黑客。
在您的“TestView”中声明:
@State var needRefresh: Bool = false
将此传递到您的“detailView”目的地,例如:
NavigationLink(destination: detailView(feed: self._feed, i: i, needRefresh: self.$needRefresh)) {
HStack {
Text(self.feed.items[i].text)
Text("(\(self.feed.items[i].read.description))")
}.accentColor(self.needRefresh ? .white : .black)
}
注意 ".accentColor(self.needRefresh ? .white : .black)"在 "needRefresh"时强制刷新
被改变。
在您的“detailView”目的地添加:
@Binding var needRefresh: Bool
然后在您的 Button 操作中的“detailView”中,添加:
self.needRefresh.toggle()
关于swiftui - 刷新 SwiftUI 列表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/57727478/