What is MetricKit?
What’s MetricKit?
MetricKit in a new framework, introduced in iOS 13 (WWDC2019), with which it is intended to gather information (metrics) about battery behavior and application performance. For a registered application, reports on the behavior of said application will be received once a day as a general rule.
Battery
Battery metrics include, among other parameters:
- The state of the mobile network.
- The transfers through the internet.
- The use of the CPU.
- The use of the GPU.
- The energy used to display the application on the screen.
- The use of device location functions.
Performance
From the point of view of performance, metrics are obtained, for example, on:
- The time it takes for the application to open (launch time).
- The response of the application with user interaction.
- The amount of time the application is active.
- The use of memory and disk.
Use
In order to receive metric reports, we need to add a subscription to MXMetricManager (for example in the AppDelegate class):
class AppDelegate: UIResponder, UIApplicationDelegate, MXMetricManagerSubscriber {
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
let shared = MXMetricManager.shared
shared.add(self)
return true
}
func applicationWillTerminate(_ application: UIApplication) {
MXMetricManager.shared.remove(self)
}
// Receive daily metrics
func didReceive(_ payloads: [MXMetricPayload]) {
// Process metrics
}
}
The didReceive method receives an array that contains the information of the last 24 hours (and of all that information that could not be received previously).
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