ORKDeviceMotionRecorder Class Reference

Inherits from	ORKRecorder : NSObject
Declared in	ORKDeviceMotionRecorder.h ORKDeviceMotionRecorder.m

Overview

The ORKDeviceMotionRecorder class represents a recorder that requests and collects device motion data from CoreMotion at a fixed frequency.

To ensure that the motion recorder continues to record when the app enters the background, use the background task support provided by UIApplication.

Other Methods

`frequency`

The frequency of motion data collection from CoreMotion in hertz (Hz).

@property (nonatomic, readonly) double frequency

Declared In

ORKDeviceMotionRecorder.h

`– initWithIdentifier:frequency:step:outputDirectory:`

Returns an initialized device motion recorder using the specified frequency.

- (instancetype)initWithIdentifier:(NSString *)identifier frequency:(double)frequency step:(nullable ORKStep *)step outputDirectory:(nullable NSURL *)outputDirectory

Parameters

`identifier`	The unique identifier of the recorder (assigned by the recorder configuration).
`frequency`	The frequency of motion data collection from CoreMotion in hertz (Hz).
`step`	The step that requested this recorder.
`outputDirectory`	The directory in which the device motion data should be stored.

Return Value

An initialized motion data recorder.

Declared In

ORKDeviceMotionRecorder.h

Other Methods

`– start`

Starts data recording.

- (void)start

Discussion

If an error occurs when recording starts, it is returned through the delegate.

Declared In

ORKRecorder.h

`– stop`

Stops data recording, which generally triggers the return of results.

- (void)stop

Discussion

If an error occurs when stopping the recorder, it is returned through the delegate. Subclasses should call finishRecordingWithError: rather than calling super.

Declared In

ORKRecorder.h

`– finishRecordingWithError:`

Indicates that recording has failed; stop recording and report the error to the delegate

- (void)finishRecordingWithError:(NSError *)error

Parameters

`error`	Error that occurred.

Declared In

ORKRecorder_Private.h

`– isRecording`

A Boolean value indicating whether the recorder is currently recording.

- (BOOL)isRecording

Return Value

YES if the recorder is recording; otherwise, NO.

Declared In

ORKRecorder.h