Complete code gist of Analytics Service and Analytics Manager

AnalyticsManager.swift

import Foundation
import UIKit

@MainActor
final class AnalyticsManager {
    static let manager: AnalyticsManager = AnalyticsManager()
    
    private var services: [any AnalyticsService] = []

    private init() {}
    
    func initialize(with services: [any AnalyticsService], application: UIApplication, launchOptions: [UIApplication.LaunchOptionsKey : Any]?) {
        self.services = services
        
        for service in services {
            service.initialise(with: application, launchOptions: launchOptions)
        }
    }
    
    func trackEvent(_ event: Event) {
        for service in services {
            service.track(event)
        }
    }
    
    func trackEvents(_ events: [Event], for type: AnalyticsType) {
        if let service = services.first(where: { $0.analyticsType as! AnalyticsType == type }) {
            for event in events {
                service.track(event)
            }
        }
    }
    
    func unsetEvent(_ event: Event) {
        for service in services {
            service.unset(event)
        }
    }
}

AnalyticsService.swift

import Foundation
import UIKit
/* THIS PART CAN BE SEPARATED IN A FRAMEWORK */
/// A struct that represents an event
public struct Event {
    /// Name of the event
    let name: String
    /// Properties of the event
    let properties: [String: Any]
}

public protocol AnalyticsService: Sendable {
    associatedtype T
    
    /// An unique type to recognise a particular analytics service
    var analyticsType: T { get }
    /// A method to track a single `Event`
    func track(_ event: Event)
    /// A method to unset an event. This can be utilised when we want to discard any tracking event for a particular action
    func unset(_ event: Event)
    /// Initialises analytics service with `UIApplication`
    func initialise(with application: UIApplication, launchOptions: [UIApplication.LaunchOptionsKey: Any]?)
}
/* THIS PART CAN BE SEPARATED IN A FRAMEWORK */

AnalyticsType.Swift

/// Various AnalyticsType
enum AnalyticsType {
    case mixpanel
    case firebase
    case heap
    // Few more analytics service type
    // ..
    // ..
}

FirebaseAnalyticsType.swift

import Foundation
import UIKit

/// Firebase Analytics Service
struct FirebaseAnalyticsService: AnalyticsService {
    var analyticsType: AnalyticsType {
        .firebase
    }
    
    func track(_ event: Event) {
        // Track Event
    }
    
    func unset(_ event: Event) {
        // Unset Event
    }
    
    func initialise(with application: UIApplication, launchOptions: [UIApplication.LaunchOptionsKey : Any]?) {
        // Initialise Firebase
    }
}

MixPanelAnalyticsService.swift

import Foundation
import UIKit

/// MixPanel Analytics Service
struct MixPanelAnalyticsService: AnalyticsService {
    var analyticsType: AnalyticsType {
        .mixpanel
    }
    
    func track(_ event: Event) {
        // Track Event
    }
    
    func unset(_ event: Event) {
        // Unset Event
    }
    
    func initialise(with application: UIApplication, launchOptions: [UIApplication.LaunchOptionsKey : Any]?) {
        // Initialise Firebase
    }
}