Swift - 如何只在星期一显示视图并且只显示一次

Question

I am trying to implement a weekly roundup feature into my iOS fitness app. I want to display the weekly roundup view every Monday and only display it once to the user, so they are not shown it every time the launch the app. I have tried checking if it is a Monday which works fine but can not find a way to only show it once.

Answer 1

One possible solution is to store when you've last shown the weekly roundup to the user, perhaps in a place like UserDefaults. To display it, you can make sure that both the Monday check that you've already built, and the date range has passed enough time.

    let isMonday = true
    var readyToShow = true
    if let date = UserDefaults.standard.object(forKey: "lastShownRoundup") as? Date, date < Date().addingTimeInterval(86400 * -6) {
        readyToShow = false
    }

    if isMonday && readyToShow {
        //show your roundup
        UserDefaults.standard.set(Date(), forKey: "lastShownRoundup")
    }

The time interval code makes sure that at least 6 days has passed since they've last seen it, which should account for viewing at night on one Monday, but in the morning of the next. You could also set this number to -1 and it should work fine.