AnalyticsManager

AnalyticsManager.swift

// 1
protocol AnalyticsProvider {
    func sendAnalyticsEvent(named name: String, metadata: [String : Any]?)
}

// 2
import FirebaseAnalytics
struct FirebaseAnalyticsProvider: AnalyticsProvider {
    func sendAnalyticsEvent(named name: String, metadata: [String : Any]?) {
        Analytics.logEvent(name, parameters: metadata)
    }
}

// 3
class AnalyticsManager {
    private var provider: AnalyticsProvider?
    static var shared = AnalyticsManager()

    private init() {}

    func configure(provider: AnalyticsProvider) {
        self.provider = provider
    }

    func track(eventName: String, metadata: [String: Any]?) {
        guard let provider = provider else {
            print("Analytics provider not provided.")
            return
        }

        provider.sendAnalyticsEvent(named: eventName, metadata: metadata)
    }
}

// Somewhere else in the code - AppDelegate, perhaps.
AnalyticsManager.shared.configure(provider: FirebaseAnalyticsProvider())

// 4
AnalyticsManager.shared.track(eventName: "user_clicked_forgot_password",
                              metadata: ["userID": "aryamansharda"])

// 5
class LocalAnalyticsProvider: AnalyticsProvider {
    func sendAnalyticsEvent(named name: String, metadata: [String : Any]?) {
        print("\(name): \(metadata)")
    }
}

// 6
// AppDelegate
#if DEBUG
AnalyticsManager.shared.configure(provider: LocalAnalyticsProvider())
#else
AnalyticsManager.shared.configure(provider: FirebaseAnalyticsProvider())
#endif