iPhone Accelerometer direction
问题 I am developing an application in which iPhone will play different sounds when moved (sword). I want to know when iPhone has moved left, right, up or down (sword movement). How can I implement this? I was testing the accelerometer and wrote this code, but it returns the same values if moved left or right. How can I know in which direction is the iPhone moved? Code: - (void)accelerometer:(UIAccelerometer *)accelerometer didAccelerate:(UIAcceleration *)acceleration { double const kThreshold = 1