Question

我想通过MotionGraphs将加速度计或传感器值保存到文件文本中。当激活deviceMotion时，它将用于下一个代码：

if ([mManager isDeviceMotionAvailable] == YES) {

    [mManager setDeviceMotionUpdateInterval:updateInterval];

    [mManager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion *deviceMotion, NSError *error) {

        // attitude

        [[weakSelf.graphViews objectAtIndex:kDeviceMotionGraphTypeAttitude] addX:deviceMotion.attitude.roll y:deviceMotion.attitude.pitch z:deviceMotion.attitude.yaw];

        //rotationRate

        [[weakSelf.graphViews objectAtIndex:kDeviceMotionGraphTypeRotationRate] addX:deviceMotion.rotationRate.x y:deviceMotion.rotationRate.y z:deviceMotion.rotationRate.z];

        // gravity

        [[weakSelf.graphViews objectAtIndex:kDeviceMotionGraphTypeGravity] addX:deviceMotion.gravity.x y:deviceMotion.gravity.y z:deviceMotion.gravity.z];

        // userAcceleration

        [[weakSelf.graphViews objectAtIndex:kDeviceMotionGraphTypeUserAcceleration] addX:deviceMotion.userAcceleration.x y:deviceMotion.userAcceleration.y z:deviceMotion.userAcceleration.z];

我认为正在使用队列，我想引入一个实现，以便从此队列保存到文件文本。

怎么可能？

Answer 1

您的代码如下：

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];
}

希望这有帮助！

修改MotionGraphs示例代码

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