Ваш код как это:
NSMutableArray *sensorData;
//[sensorData removeAllObjects];
if ([mManager isDeviceMotionAvailable] == YES) {
[mManager setDeviceMotionUpdateInterval:updateInterval];
[mManager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion *deviceMotion, NSError *error) {
NSString *strSensorData = [NSString stringWithFormat:@"%.6f %.6f %.6f %.6f %.6f %.6f %.6f %.6f %.6f %.6f %.6f %.6f %.6f", deviceMotion.timestamp, deviceMotion.attitude.roll, deviceMotion.attitude.pitch, deviceMotion.attitude.yaw, deviceMotion.rotationRate.x, deviceMotion.rotationRate.y, deviceMotion.rotationRate.z, deviceMotion.gravity.x, deviceMotion.gravity.y, deviceMotion.gravity.z, deviceMotion.userAcceleration.x, deviceMotion.userAcceleration.y, deviceMotion.userAcceleration.z];
[sensorData addObject:strSensorData];
//...
}
- (void)stopUpdates
{
CMMotionManager *mManager = [(APLAppDelegate *)[[UIApplication sharedApplication] delegate] sharedManager];
if ([mManager isDeviceMotionActive] == YES) {
[mManager stopDeviceMotionUpdates];
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *docDir = [paths objectAtIndex: 0];
NSString *docFile = [docDir stringByAppendingPathComponent: @"sensordata.txt"];
NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:docDir])
[fileManager createFileAtPath:docDir
contents:nil
attributes:nil];
//[sensorData writeToFile:docFile atomically:YES];
[sensorData.description writeToFile:docFile atomically:YES encoding:NSUTF8StringEncoding error:nil];
}
Надежда это помогает!