State 未更新到 swiftUI 中的另一个视图

Question

I am using this for saving user info in user defaults for user isRegsitered.

struct UserKeys {
    static let isUserRegistered = "isUserRegistered"
}
@propertyWrapper
struct UserDefault<T> {
    let key: String
    let defaultValue: T
    
    init(_ key: String, defaultValue: T) {
        self.key = key
        self.defaultValue = defaultValue
    }
    
    var wrappedValue: T {
        get {
            return UserDefaults.standard.object(forKey: key) as? T ?? defaultValue
        }
        set {
            UserDefaults.standard.set(newValue, forKey: key)
        }
    }
}
final class UserSettings: ObservableObject {

    let objectWillChange = PassthroughSubject<Void, Never>()

    @UserDefault(UserKeys.isUserRegistered, defaultValue: false)
    var isUserRegistered: Bool {
        willSet {
            objectWillChange.send()
        }
    }
}

// The Popup Login window on Same Dashboard View.

struct PopUpWindow: View {
    @ObservedObject var userRepo = UserSettings()
 Button(action: {
                            // Dismiss the PopUp
                            withAnimation(.linear(duration: 0.3)) {
                                userRepo.isUserRegistered = true
                                show = false
                                hideKeyboard()
                            }
                        }, label: {
                            Text("Submit")

& further I am listing in DashBoardView View as -

struct DashBoardView: View {

    @ObservedObject var userRepo = UserSettings()

    private var content: some View {
        if !userRepo.isUserRegistered {
            return PopUpWindow(show: .constant(true)) .eraseToAnyView()
        }
// .. Other conditions .. 

So basically I have popup with Login box so after submit I am trying to dismiss dialog & want to listen value userRepo.isUserRegistered

Answer 1

By initializing UserSettings class independently in both PopUpWindow and DashBoardView , you are actually saying that each view is managing its own data, hence the two views are not sharing the same data.

You should not initialize your UserSettings class from the PopUpWindow view, but instead, pass an instance to from DashBoardView . The code would look like this:

PopUpWindow

struct PopUpWindow: View {
    @ObservedObject var userRepo: UserSettings
    Button(action: {
           // Dismiss the PopUp
           withAnimation(.linear(duration: 0.3)) {
           userRepo.isUserRegistered = true
           show = false
           hideKeyboard()
           }
           }, label: {
           Text("Submit")
// .. Other conditions .. 

and then:

DashBoardView

struct DashBoardView: View {
    
    @ObservedObject var userRepo = UserSettings()
    
    private var content: some View {
        if !userRepo.isUserRegistered {
            return PopUpWindow(userRepo: userRepo, show: .constant(true)) .eraseToAnyView()
        }
// .. Other conditions ..