iphone: what libraries or APIs need to be used for CPU , RAM usage in iPhone

问题

I am pretty new to iphone development, can any body guide me through with some APIs and libraries which be used for:

1. RAM usage
2. CPU usage

in iPhone

need to do something like this app

回答1:

For Battery usage you can implement this notification

UIDeviceBatteryLevelDidChangeNotification 

I am not sure about CPU and Ram usage.

来源：https://stackoverflow.com/questions/6519531/iphone-what-libraries-or-apis-need-to-be-used-for-cpu-ram-usage-in-iphone