UIViewController+GATracker.swift

import UIKit

extension UIViewController {
    
    func trackScreen(name: String) {
        if let tracker = GAI.sharedInstance().defaultTracker {
            tracker.set(kGAIScreenName, value: name)
            
            let screenView = GAIDictionaryBuilder.createScreenView().build()
            tracker.send(screenView as [NSObject : AnyObject])
        }
    }
    
    func trackEvent(category: String, action: String, label: String? = nil, value: NSNumber? = nil) {
        if let tracker = GAI.sharedInstance().defaultTracker {
            let eventWithCategory = GAIDictionaryBuilder.createEventWithCategory(category, action: action, label: label, value: value).build()
            tracker.send(eventWithCategory as [NSObject : AnyObject])
        }
    }
    
    func trackTiming(category: String, value: NSNumber, name: String? = nil,  label: String? = nil){
        if let tracker = GAI.sharedInstance().defaultTracker {
            let timingWithCategory = GAIDictionaryBuilder.createTimingWithCategory(category, interval: value, name: name, label: label).build()
            tracker.send(timingWithCategory as [NSObject : AnyObject])
            
        }
    }
    
    func trackMetric(value: String, index: UInt = 1) {
        if let tracker = GAI.sharedInstance().defaultTracker {
            let metricName = GAIFields.customMetricForIndex(index)
            tracker.set(metricName, value: value)
        }
    }
}