CoreMotion

Read device sensor data -- accelerometer, gyroscope, magnetometer, pedometer, and activity recognition -- on iOS and watchOS. CoreMotion fuses raw sensor inputs into processed device-motion data and provides pedometer/activity APIs for fitness and navigation use cases. Targets Swift 6.3 / iOS 26+.

Contents

• Setup
• CMMotionManager: Sensor Data
• Processed Device Motion
• CMPedometer: Step and Distance Data
• CMMotionActivityManager: Activity Recognition
• CMAltimeter: Altitude Data
• Update Intervals and Battery
• Common Mistakes
• Review Checklist
• References