How to clear push notification badge count in iOS?

Question

I want to clear the push notification badge count once app is launched.Im not clear where to set the below code.Please give brief description about clearing the badge count.

Answer 1

in swift 3+

in your AppDelegate.Swift , when your application active clear all like below.

func applicationDidBecomeActive(_ application: UIApplication) {
    UIApplication.shared.applicationIconBadgeNumber = 0
}