CMDeviceMotion 不提供态度信息
由于某种原因，我的 iPad2 不提供运动姿态信息。我正在做据我所知正是人们所说的事情，但仍然......没有数据。
float angle = 0;
CMDeviceMotion *deviceMotion;
CMAttitude *attitude;
deviceMotion = motionManager.deviceMotion;
if (deviceMotion) {
attitude = deviceMotion.attitude;
[attitude multiplyByInverseOfAttitude:referenceAttitude];
angle = [attitude roll];
} else {
NSLog (@"Cannot get angles.");
}
在我的代码的前面，我这样做了：
motionManager = [[CMMotionManager alloc] init];
if (motionManager.gyroAvailable) {
[motionManager startGyroUpdates];
}
但是我从来没有得到角度。帮助？
For some reason my iPad2 is not providing motion attitude information. I am doing AFAIK precisely what people say to do but still... no data.
float angle = 0;
CMDeviceMotion *deviceMotion;
CMAttitude *attitude;
deviceMotion = motionManager.deviceMotion;
if (deviceMotion) {
attitude = deviceMotion.attitude;
[attitude multiplyByInverseOfAttitude:referenceAttitude];
angle = [attitude roll];
} else {
NSLog (@"Cannot get angles.");
}
Earlier in my code I do this:
motionManager = [[CMMotionManager alloc] init];
if (motionManager.gyroAvailable) {
[motionManager startGyroUpdates];
}
However I never get the angle. Help?
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调用initialisaiton：和
stopDeviceMotionUpdates。如果您使用设备运动更新，您只会获得态度，即您必须在进入后台时
You only get attitude if you use device motion updates, i.e. you have to call for initialisaiton:
And
stopDeviceMotionUpdateswhen going to background.