---
title: applicationDidBecomeActive()
framework: watchkit
role: symbol
role_heading: Instance Method
path: watchkit/wkapplicationdelegate/applicationdidbecomeactive()
---

# applicationDidBecomeActive()

Tells the delegate that the watchOS app is visible and processing events.

## Declaration

```swift
optional func applicationDidBecomeActive()
```

## Discussion

Discussion WatchKit calls this method to let you know that your app transitioned from the inactive to the active state. Use this method to start or unpause any tasks. For example, you could use it to start timers. You can also use it to gather information needed to configure your app’s initial user interface. note: When creating an app that uses the SwiftUI App protocol to manage your life cycle, use the onChange(of:perform:) modifier and the scenePhase environment value to monitor life cycle changes when possible. For more information, see Building a watchOS app.

## See Also

### Monitoring state changes

- [Working with the watchOS app life cycle](watchkit/working-with-the-watchos-app-life-cycle.md)
- [main()](watchkit/wkapplicationdelegate/main().md)
- [applicationDidFinishLaunching()](watchkit/wkapplicationdelegate/applicationdidfinishlaunching().md)
- [applicationWillResignActive()](watchkit/wkapplicationdelegate/applicationwillresignactive().md)
- [applicationWillEnterForeground()](watchkit/wkapplicationdelegate/applicationwillenterforeground().md)
- [applicationDidEnterBackground()](watchkit/wkapplicationdelegate/applicationdidenterbackground().md)
- [deviceOrientationDidChange()](watchkit/wkapplicationdelegate/deviceorientationdidchange().md)