在后台获取上调用完整函数时，何时需要使用“ .noData”？

Question

If you have set up a background fetch task to run on iOS, after it completes, you're required to call completionHandler with one of three options: .newData , .noData or .failed . Depending on which one you pick and how your tasks succeed, apparently iOS decides how often your app's background fetch is run.

.newData is the obvious default if everything went fine and .failed is the obvious fail option, but what about .noData ? If iOS penalizes me for attempting to fetch data that is stale, why would I ever want to tell iOS about this? If this affects the frequency of the background job, wouldn't I be better off just always telling iOS that all data I fetched was new to avoid my app being forced to run background jobs less often than what I defined in setMinimumBackgroundFetchInterval ?

Answer 1

Depending on which one you pick and how your tasks succeed, apparently iOS decides how often your app's background fetch is run.

That's a false assumption. What is evaluated is the time and energy you use before calling the completion handler. Do not try to game the system; just be quick, efficient, and honest.