swift - logInWithUsernameInBackground 的使用不明确

Question

您好，尝试让 Back4App loginInWithUserName 与 SwiftUI 一起使用，但不断收到以下错误

Ambiguous use of logInWithUsernameInBackground

在 PFUser.logInWithUsernameInBackground($userName, 密码: $passWord)

struct ContentView: View {

@State var userName: String = ""
@State var passWord: String = ""
@State var authDidFail: Bool = false
@State var authDidWork: Bool = false
@State var editingMode: Bool = false

let storedUserName = "not your father"
let storedPassword = "this is not the password"



var body: some View {
    ZStack{
        VStack{
            Text("WIK?")
                .font(.largeTitle)
                .fontWeight(.semibold)
                .padding(.bottom, 20)
            Image("WIK")
                .clipShape(Circle())
            UserNameTextField(userName: $userName, editingMode: $editingMode)
            PasswordSecureField(passWord: $passWord)

            if authDidFail {
                Text("Information you entered was incorrect.  Try again.")
                    .offset(y: -10)
                    .foregroundColor(.red)
            }

            Button(action: {

                //need to check against back4app and set current user variable
                PFUser.logInWithUsernameInBackground($userName, password: $passWord){
                    (user: PFUser?, error: NSError?) -> Void in
                    if user != nil{
                        //worked
                    }else {
                        //error
                    }

                }


                if self.userName == self.storedUserName && self.passWord == self.storedPassword {
                    self.authDidWork = true
                } else {
                    self.authDidFail = true
                }
            }){
                LoginButtonContent()
            }
        }
        //vStack padding
        .padding()
        if authDidWork {
            Text("Log in worked")
            .font(.headline)
            .frame(width: 250, height: 20)
            .background(Color.green)
            .cornerRadius(20.0)
            .foregroundColor(.white)
            .animation(Animation.default)
        }
    }
    //ZStack
        .offset(y: editingMode ? -150 :0)

}

}

尝试查看 $username 和 $password 字符串作为 Object[""]: String

还尝试了字符串值self.userName和self.passWord

并尝试了字符串值userName和passWord

Answer 1

您需要使用String值，而不是 Binding<String> :

PFUser.logInWithUsernameInBackground(userName, password: passWord)