CMMotionActivityManager isActivityAvailable device

问题:

I want to use CMMotionActivityManager, I would like to know what devices motion data is available on? Many of the places that i have read suggest that it is currently only on devices that have the M7 chip.

https://developer.apple.com/library/ios/documentation/CoreMotion/Reference/CMMotionActivityManager_class/Reference/Reference.html#//apple_ref/occ/cl/CMMotionActivityManager

回答1:

isActivityAvailable will return true on the M7 equipped devices:

iPhone5S
iPad mini with retina
iPad Air

Apple is not telling implicitly in the documentation, perhaps leaving other implementation options open and allowing the customer to disable the tracking sensor for privacy reasons.