How to detect when iPhone is moving in X direction?

How do I detect that the iPhone is moving in a particular direction (X-axis)? Can you show s开发者_高级运维ome sample code?

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You can do it with help of UIAccelerometer and check the movement fo phone in x-axis by:

 - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)aceler {
        if (sqrt(aceler.x * aceler.x) > 1.5f)
        {
                  //write your code here
        }
    }

Hope this helps.

Thanks,

Madhup