Detect gesture accelerometer

I'm creating an iPhone application. My application needs to detect the movements of the accelerometer and report the case of movement by the user. In practice I have to constantly check that the coordinates received from accelerometer are equal to the coordinates saved in my movement. My problem is that its implementation is not simp开发者_运维问答le because I know there are many factors that create difficulties. Someone knows a tutorial or guide to propose. I also welcome suggestions ... Thank you very much

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You can use this paper as a starting point.

It shows detection of a user walking, running, walking up or down stairs or standing still. Even though it's based on Android the principle will be the same.