Question

An AI wrote this Swift method to keep a delivery map fresh by polling the server for the courier's position. It works, but users report the app drains the battery and runs hot, and your backend sees a constant request flood even when the app is idle in the background. What's wrong and how would you fix it?

1func trackCourier() {2    DispatchQueue.global().async {3        while true {4            if let loc = self.api.fetchCourierLocationSync() {5                DispatchQueue.main.async { self.updateMap(loc) }6            }7            usleep(200_000)   // poll every 200ms8        }9    }10}