SwiftUI@EnvironmentObejct can';似乎无法更新值
我正在尝试使用@EnvironmentObject更新ViewModel中的布尔值。因此,当我导航回原始屏幕时,我希望布尔值发生更改,从而更改文本。也尝试过使用ObservedObject。这不起作用,或者找不到ContentView在更改时重新绘制自身的方法SwiftUI@EnvironmentObejct can';似乎无法更新值,swiftui,swiftui-navigationlink,swiftui-environment,Swiftui,Swiftui Navigationlink,Swiftui Environment,我正在尝试使用@EnvironmentObject更新ViewModel中的布尔值。因此,当我导航回原始屏幕时,我希望布尔值发生更改,从而更改文本。也尝试过使用ObservedObject。这不起作用,或者找不到ContentView在更改时重新绘制自身的方法 import SwiftUI class Global: ObservableObject { @Published var change = [false, false] } struct ContentView: Vi
import SwiftUI
class Global: ObservableObject {
@Published var change = [false, false]
}
struct ContentView: View {
var body: some View {
NavigationView {
VStack {
NewView().environmentObject(Global())
}
}
}
}
struct NewView: View {
@EnvironmentObject var env: Global
var body: some View {
Text(env.change[1] ? "WORKS" : "DOESNT WORK")
NavigationLink(destination: ChangeThis().environmentObject(Global())) {
Text("Push Me to Change")
}
}
}
struct ChangeThis: View {
@EnvironmentObject var env: Global
var body: some View {
Button(action: {
env.change[0] = true
env.change[1] = true
}) {
Text(" Want this to Changes the Boolean values in Global and update NewView with those values after clicking back")
}
}
}
您需要在所有视图中使用相同的
全局
环境对象实例:
struct NewView: View {
@EnvironmentObject var env: Global
...
// pass the already-existing instance, don't create a new one
NavigationLink(destination: ChangeThis().environmentObject(env)
...
}