CoreMotion - magnetField始终为0 [英] CoreMotion - magneticField is always 0

问题描述

我正在尝试使用磁力计：

I'm trying to use magnetometer:

[myMotionMngr startDeviceMotionUpdatesToQueue: [NSOperationQueue currentQueue]
                                  withHandler:^(CMDeviceMotion *motion, NSError *error) 
{
    printf("%f\t%f\t%f\n", motion.magneticField.field.x, motion.magneticField.field.y, motion.magneticField.field.z);
    CMMagneticFieldCalibrationAccuracy acc = motion.magneticField.accuracy;
}];

并且归档（x，y，z）始终为0.
motion.magneticField.accuracy 总是 CMMagneticFieldCalibrationAccuracyUncalibrated 。根据文档，这意味着我的设备没有磁力计，但这不是真的，因为我正在使用iOS 5.0在iPad2上进行测试。

And the filed (x,y,z) is always 0. motion.magneticField.accuracy is always CMMagneticFieldCalibrationAccuracyUncalibrated. According to docs it means that my device has got no magnetometer, however it is no true cause I'm testing on iPad2 with iOS 5.0.

我缺少什么？

推荐答案

尝试

startDeviceMotionUpdatesUsingReferenceFrame：toQueue：withHandler：

startDeviceMotionUpdatesUsingReferenceFrame:toQueue:withHandler:

它应该有效

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