Objective-c SDK for ios application to analyse the number of active users load the application.

Objective-c SDK for ios application to analyse the number of active users
load the application.

Is there are any recommended SDK to analyse the number of active user of
my ios application. I need to analyse the number of users load the
application per day and also it would be great if we able to analyse the
maximum use of functionality in the application(For example like if the
application as 10 functionality and the active users most often use the 5
out of 10 functionality).