The classes to adapt

In this example, we'll adapt both Mixpanel and Google Analytics for Firebase. Let's have a look at how both look, and how to use them:

open class MixpanelInstance: CustomDebugStringConvertible, FlushDelegate, AEDelegate {
    /* ... */
    open func track(event: String?, properties: Properties? = nil) {
        /* ... */
    }
}

It is possible to use Mixpanel to track an event with additional properties:

Mixpanel.mainInstance()
    .track(event: "Read Book", 
           properties: ["name": "Design Patterns with Swift", 
                        "format": "paperback"])

Google Analytics for Firebase, however, exposes the tracking method through a static method from Objective-C:

NS_SWIFT_NAME(Analytics)
@interface FIRAnalytics : NSObject

/* ... */

+ (void)logEventWithName:(NSString *)name
        parameters:(nullable NSDictionary<NSString *, id> *)parameters
        NS_SWIFT_NAME(logEvent(_:parameters:));

/* ... */

@end

To use this library, you will have to use the following code:

Analytics.logEvent("Read Book", 
                   parameters: ["name": "Design Patterns with Swift", 
                                "format": "paperback"])