ios - swift 位置 : Fire every X Meters a Notification

Question

我希望你们能帮助我，因为我的大脑因思考而燃烧:D。我想通知用户，例如每 100 米。但我不想改变位置服务的刷新。有一个简单的方法，但我不喜欢它。我认为有更好的解决方案。到目前为止我所做的(那是伪代码!)这在 didUpdateLocation 中调用

 //We want notify User but only 5 times during the movement
        if distanceToReport < settedDistance {
            //Store that first Notification is fired
            if !firstNotificationFired {
                self.notifyUser(report: report)

            }
            if firstNotificationFired && distanceToReport <= 400 {
                //Store that second Notification is fired
                self.notifyUser(report: report)
            } else if secondNotificationFired && distanceToReport <= 300 {
                //Store that third Notification is fired
            } else if thirdNotificationFired && distanceToReport <= 200 {
                //Store that fourth Notification is fired
            } else if fourthNotifiationFired && distanceToReport <= 100 {
                //Store that fifth Notification is fired
            }


        }

还有比这更好、更有效的方法吗？或者有什么数学或算法可能有帮助吗？

到目前为止，谢谢。

Answer 1

清理代码的一种方法是将距离放入变量中，并在每次通知时递增，应该减少 if 语句。

if notificationShouldFire && distanceToReport <= targetDistance {
   self.notifyUser(report: report)
   targetDistance += targetDistance + 100
   notificationShouldFire = true
   // could also use count variable rather than a variable for each notif.
   firedNotifications += firedNotifications + 1
}

// your if statement would change slightly
if firedNotifications <= 5 && distanceToReport <= targetDistance {
   // increment and notify here
}

我认为，如果你愿意，你可以稍微提高效率，但你所拥有的并不是世界末日。