从iOS中的RotationMatrix获取标题
我从我的CMMotionManager收到旋转矩阵，并希望从中计算手机的航向，例如，北纬38度，避开CLLocationManager，以便制作更精确的罗盘：从iOS中的RotationMatrix获取标题,ios,compass-geolocation,rotational-matrices,heading,cmmotionmanager,Ios,Compass Geolocation,Rotational Matrices,Heading,Cmmotionmanager,我从我的CMMotionManager收到旋转矩阵，并希望从中计算手机的航向，例如，北纬38度，避开CLLocationManager，以便制作更精确的罗盘： [motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXTrueNorthZVertical toQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion
[motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXTrueNorthZVertical toQueue:[NSOperationQueue mainQueue] withHandler:^(CMDeviceMotion *deviceMotion, NSError *error) {
CMRotationMatrix rm = deviceMotion.attitude.rotationMatrix;
// Get the heading.
motionHeading = M_PI + atan2(rm.m22, rm.m12);
motionHeading = motionHeading*180/M_PI;