StateObject 作为 init() 中另一个对象的参数

Question

我正在尝试将 StateObject 用户传递给 authenticationHelper 但我不能，因为 IDE 表示 'self is used before all stored properties are initialized'，即使它是在结构的开头初始化的。我考虑过将 user 的初始化移动到 init() 但是我又不能，因为它是一个 get-only 属性并且必须立即初始化。有解决办法吗？

@main
struct Test: App {
    @StateObject var user: User = User()
    var authenticationHelper: AuthenticationHelper

    init(){
        self.authenticationHelper = AuthenticationHelper(user: user)
    }

    var body: some Scene {
        WindowGroup {
            LoginView(user: user)
        }
    } 
}

Answer 1

使用计算属性

struct Test: App {
    
    @StateObject var user: User = User()
    var authenticationHelper: AuthenticationHelper {
        return AuthenticationHelper(user: user)
    }
    
    init() {
    }
}

你也可以这样使用

struct Test: App {
    
    @StateObject var user: User
    var authenticationHelper: AuthenticationHelper
 
    init() {
        let user = User()
        self._user = StateObject(wrappedValue: user)
        self.authenticationHelper = AuthenticationHelper(user: user)
    }
}

StateObject 作为 init() 中另一个对象的参数

StateObject as parameter for another object in init()

state

swift

swiftui