计算每个应用程序的蜂窝数据使用量

Question

如何获取单个iOS应用程序的数据消耗（即，如果设备有10个应用程序消耗数据，我想知道每个应用程序消耗多少数据）

Answer 1

Short answer: you can't.

Long answer: all iOS applications are executed in a sandboxed environment, limiting the access that you have to data from another applications to avoid malicious behavior. The only way that you could obtain this information is if iOS had a public API that provided that information (it doesn't) or if the other applications published their information somewhere reachable from your application.