如何在ios14.2(SwiftUI)中同时刷新详细视图和主视图
嗨,我想刷新由主视图下的数据更改触发的详细视图如何在ios14.2(SwiftUI)中同时刷新详细视图和主视图,swiftui,ios14,Swiftui,Ios14,嗨,我想刷新由主视图下的数据更改触发的详细视图 我的方法是设置一个联合侦听器,并从细节视图触发刷新 它在ios13上工作,但我不能让它在ios14.2上工作,有什么解决方法吗? 这是我的主视图 import SwiftUI struct MainView: View { @ObservedObject var viewModel : MainViewModel init(){ viewModel = MainViewModel.shared
我的方法是设置一个联合侦听器,并从细节视图触发刷新
它在ios13上工作,但我不能让它在ios14.2上工作,有什么解决方法吗?
这是我的主视图
import SwiftUI
struct MainView: View {
@ObservedObject var viewModel : MainViewModel
init(){
viewModel = MainViewModel.shared
}
var body: some View {
NavigationView{
List {
ForEach(viewModel.games ,id:\.self) { game in
NavigationLink(destination: self.navDest(game: game)){
Text("\(game)")
}
}
}
}
}
func navDest(game: Int) -> some View{
print("games value:",game)
return LazyView(DetailView(game: game ))
}
}
主视图模型侦听来自详细视图的事件并更新值
import Foundation
import SwiftUI
import Combine
class MainViewModel : ObservableObject {
@Published var games : [Int] = []
static let shared = MainViewModel()
private var tickets: [AnyCancellable] = []
init(){
for i in 0...5{
games.append(i)
}
addObservor()
}
func addObservor(){
NotificationCenter.default.publisher(for: .updateGame)
.map{$0.object as! Int}
.sink { [unowned self] (game) in
self.updateGame(game: game)
}.store(in: &tickets)
}
func updateGame(game:Int){
print("updateView index:",game)
self.games[game] = 9999
print("after update",games)
}
}
import SwiftUI
struct DetailView: View {
@ObservedObject var viewModel : DetailViewModel
init(game: Int) {
print("init detail",game)
viewModel = DetailViewModel(game:game)
}
var body: some View {
VStack{
Text("\(viewModel.game)")
Button("update"){
viewModel.sendUpdate()
}
}
}
}
当我单击“从详细视图更新”时,它应该同时刷新主视图和详细视图。
(流程是DetailViewModlel->MainViewModlel->refresh MainView->refresh DetailView(当前显示)),但它在iOS 14.2上不起作用
import Foundation
import SwiftUI
class DetailViewModel : ObservableObject {
var period : String = ""
var game : Int = 0
// init(period:String,game: Int){
// self.period = period
init(game: Int){
self.game = game
}
func sendUpdate(){
NotificationCenter.default.post(name: .updateGame, object: game)
}
}
extension Notification.Name {
static let updateGame = Notification.Name("updateGame")
}
struct LazyView<Content: View>: View {
let build: () -> Content
init(_ build: @autoclosure @escaping () -> Content) {
self.build = build
}
var body: Content {
build()
}
}
我已经记录了调试消息,看起来数据确实更改了,但视图没有更改。触发区域是DetailViewModel下的NotificationCenter。MainView有一个接收它的观察,并触发了MainView和DetailView上的重新加载。如果我在DetailView中按下back按钮,我可以看到数据被刷新,但按下back之前的DetailView没有。我得到了非常类似的结果,在Xcode 12.1中工作正常,但没有更新Xcode 12.2中NavigationView显示的视图。Xcode 12.2内部的14.1模拟器可以,但14.2模拟人生或设备则不行
import SwiftUI
struct DetailView: View {
@ObservedObject var viewModel : DetailViewModel
init(game: Int) {
print("init detail",game)
viewModel = DetailViewModel(game:game)
}
var body: some View {
VStack{
Text("\(viewModel.game)")
Button("update"){
viewModel.sendUpdate()
}
}
}
}