Question

我有一个定义为Singleton的类，我尝试从该类访问2个函数，但是遇到一个错误，即找不到该类，但是当我按Cmd +单击时，我能够导航到该类。我重启了xCode了很多次，还尝试了xCode 10和xCode 9 ...相同的错误。我不知道如何解决。

这是我的代码：

// First Class
class BankAccount {

    private init() {}

    static let bankAccountKey = "Bank Account"
    static let suiteName = "group.com.YourName"

    // Function to set the balance for ShoppingLand Bank
    static func setBalance(toAmount amount: Double) {
        guard let defaults = UserDefaults(suiteName: suiteName) else { return }
        defaults.set(amount, forKey: bankAccountKey)
        defaults.synchronize()
    }

    // Function to check new updates about the balance of ShoppingLand Bank
    static func checkBalance() -> Double? {
        guard let defaults = UserDefaults(suiteName: suiteName) else { return nil }
        defaults.synchronize()
        let balance = defaults.double(forKey: bankAccountKey)
        return balance
    }

    @discardableResult
    static func withdraw(amount: Double) -> Double? {
        guard let defaults = UserDefaults(suiteName: suiteName) else { return nil }
        let balance = defaults.double(forKey: bankAccountKey)
        let newBalance = balance - amount
        setBalance(toAmount: newBalance)
        return newBalance
    }

    @discardableResult
    static func deposit(amount: Double) -> Double? {
        guard let defaults = UserDefaults(suiteName: suiteName) else { return nil }
        let balance = defaults.double(forKey: bankAccountKey)
        let newBalance = balance + amount
        setBalance(toAmount: newBalance)
        return newBalance
    }
}

// Second Class

import Intents

class IntentHandler: INExtension {}

extension IntentHandler: INSendPaymentIntentHandling {
    func handle(intent: INSendPaymentIntent, completion: @escaping (INSendPaymentIntentResponse) -> Void) {

        guard let amount = intent.currencyAmount?.amount?.doubleValue else {
            completion(INSendPaymentIntentResponse(code: .failure, userActivity: nil))
            return
        }

        BankAccount.withdraw(amount: amount)
        completion(INSendPaymentIntentResponse(code: .success, userActivity: nil))
    }
}


extension IntentHandler: INRequestPaymentIntentHandling {
    func handle(intent: INRequestPaymentIntent, completion: @escaping (INRequestPaymentIntentResponse) -> Void) {

        guard let amount = intent.currencyAmount?.amount?.doubleValue else {
            completion(INRequestPaymentIntentResponse(code: .failure, userActivity: nil))
            return
        }
        BankAccount.deposit(amount: amount)
        completion(INRequestPaymentIntentResponse(code: .success, userActivity: nil))

    }
}

这是一个演示：

http://recordit.co/NoXKlT3dw1

谢谢您的时间！

Answer 1

确保您的BankAccount类文件可用于另一个目标-> ShoppingLandSiri。您可以从文件检查器视图中对其进行检查。

Answer 2

您没有正确设置单身人士。 BankAccount是一个类，而不是一个实例。单例是类的一个版本，其中仅一个实例将被访问，但是您仍在访问一个实例。您需要添加：

class BankAccount {
    static let shared = BankAccount()
    ...

到您的BankAccount类。 shared属性是实际的单例实例。稍后，当您尝试访问单例时，而不是

BankAccount.withdraw(amount: amount)

您要使用该实例：

BankAccount.shared.withdraw(amount: amount)

实际上我可以访问该标识符时，如何解决错误“使用未解析的标识符”

2 个答案: