How to determine the number of days a user has used an app using swift?-CodePudding

I want to determine the number of days a user has used an iOS app. I want to trigger an amplitude event the first to fourth days but not after the fourth day he uses it. How can I track how many days the user used the app?

CodePudding user response：

Note and count the days the user enters

CodePudding user response：

One approach is using UserDefaults to count how many times users open the app:

var userOpenApp: Int {
    get {
        UserDefaults.standard.integer(forKey: "UserOpenApp")
    }
    set {
        UserDefaults.standard.set(newValue, forKey: "UserOpenApp")
    }
}

then check the number in sceneDelegate or appDelegate, and update it:

userOpenApp // check the number
userOpenApp = userOpenApp   1 // update the number