Firebase 远程配置在初始请求时产生结果答案

【问题标题】：Firebase Remote Config results on initial requestFirebase 远程配置在初始请求时产生结果
【发布时间】：2018-02-05 18:39:33
【问题描述】：

我正在使用单例从 Firebase 远程配置文件中获取参数。第一次运行应用程序时，我只能从单例中访问默认值；后续运行正确返回配置的值。有什么更好的方法可以做到这一点，以便我可以从头开始访问这些值？

protocol RemoteConfigProtocol {
    func remoteConfigReceived()
}

class RemoteConfigManager {

    static let sharedInstance = RemoteConfigManager()
    var delegate: RemoteConfigProtocol?

    let demoTitle: String

    // private initialiser for the singleton
    private init() {
        // Configure for dev mode, if needed
        let remoteConfig = RemoteConfig.remoteConfig()
        #if DEBUG
            let expirationDuration: TimeInterval = 0
            remoteConfig.configSettings = RemoteConfigSettings(developerModeEnabled: true)!
        #else
            let expirationDuration: TimeInterval = 3600
        #endif

        // default values
        let appDefaults: [String: NSObject] = [
            "demo_title": "Default Title" as NSObject
        ]
        remoteConfig.setDefaults(appDefaults)

        // what exactly does "activeFetched" do, then?
        remoteConfig.activateFetched()

        // set the values
        self.demoTitle = remoteConfig["demo_title"].stringValue!

        // this seems to prep app for subsequent launches
        remoteConfig.fetch(withExpirationDuration: expirationDuration) { status, _ in
            print("Fetch completed with status:", status, "(\(status.rawValue))")
            self.delegate?.remoteConfigReceived()
        }
    }
}

当异步fetch 命令在上面的代码中返回时（可能带有参数值），我仍然无法访问来自配置文件的这些值。只有在应用程序的后续运行时，它们才会出现。这是为什么？我的代码中是否缺少某些内容？

【问题讨论】：

标签： ios firebase firebase-remote-config

【解决方案1】：

您需要在获取完成后调用 activateFetched()。现在，您将其称为 before 甚至开始获取。在您调用 activateFetched() 之前，您的应用无法使用获取的配置参数。

【讨论】：

是的！此外，我的变量需要在此之后重置。谢谢！

【解决方案2】：

根据@doug-stevenson 的回答，这是获取配置参数并立即使用它们的代码：

protocol RemoteConfigProtocol {
    func remoteConfigReceived()
}

class RemoteConfigManager {

    static let sharedInstance = RemoteConfigManager()
    var delegate: RemoteConfigProtocol?

    var demoTitle: String

    // private initialiser for the singleton
    private init() {
        // Configure for dev mode, if needed
        let remoteConfig = RemoteConfig.remoteConfig()
        #if DEBUG
            let expirationDuration: TimeInterval = 0
            remoteConfig.configSettings = RemoteConfigSettings(developerModeEnabled: true)!
        #else
            let expirationDuration: TimeInterval = 3600
        #endif

        // default values
        let appDefaults: [String: NSObject] = [
            "demo_title": "Default Title" as NSObject
        ]
        remoteConfig.setDefaults(appDefaults)

        // set the values from the defaults
        self.demoTitle = remoteConfig["demo_title"].stringValue!

        // fetch the new values
        remoteConfig.fetch(withExpirationDuration: expirationDuration) { status, _ in
            print("Fetch completed with status:", status, "(\(status.rawValue))")

            // activate the newly fetched values
            remoteConfig. activateFetched()

            // reset my variables
            self.demoTitle = remoteConfig["demo_title"].stringValue!

            // tell my view controller to update the UI
            self.delegate?.remoteConfigReceived()
        }
    }
}

【讨论】：