Need correct implementation for pedometer (using CMPedometer) & counter in the App (Must have iphone 5s or above for CMPedometer)

Hi there, I need a pedometer correct implementation in an iOS App which works on iphone5s & above (m7 chip). It needs to start counting steps and the person would be walking & stops on "stop button" (using method stopPedometerUpdates), then when again start button is hit, it starts counting again. Use CMPedometer class. Should be tested on iphone5s or iphone6. Who has worked with pedometer, its a couple of hours work for them. . Thanks.