使用CMDeviceMotion跟踪iPhone随时间的倾斜。
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我正在尝试使用CMDeviceMotion跟踪iPhone向后倾斜的时间，然后执行一些操作。我已经成功创建了CMMotionManager，正在从系统中获取运动数据，并且正在对高于特定加速度的结果进行过滤。
我要做的是检测设备何时以一定速度向后或向前倾斜。我怎么做？
这是我到目前为止的代码：
更新：我想我解决了。我一直在寻找rotationRate属性CMRotationRate。我已经将它们配对在一起，我真的只需要x值，所以我会继续努力。如果有人在下面的代码中有一些提示，非常感谢。
- (void)startMotionManager{
if (motionManager == nil) {
motionManager = [[CMMotionManager alloc] init];
}
motionManager.deviceMotionUpdateInterval = 1/15.0;
if (motionManager.deviceMotionAvailable) {
NSLog(@\"Device Motion Available\");
[motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue currentQueue]
withHandler: ^(CMDeviceMotion *motion, NSError *error){
//CMAttitude *attitude = motion.attitude;
//NSLog(@\"rotation rate = [%f, %f, %f]\", attitude.pitch, attitude.roll, attitude.yaw);
[self performSelectorOnMainThread:@selector(handleDeviceMotion:) withObject:motion waitUntilDone:YES];
}];
//[motionManager startDeviceMotionUpdates];
} else {
NSLog(@\"No device motion on device.\");
[self setMotionManager:nil];
}
}
- (void)handleDeviceMotion:(CMDeviceMotion*)motion{
CMAttitude *attitude = motion.attitude;
float accelerationThreshold = 0.2; // or whatever is appropriate - play around with different values
CMAcceleration userAcceleration = motion.userAcceleration;
float rotationRateThreshold = 7.0;
CMRotationRate rotationRate = motion.rotationRate;
if ((rotationRate.x) > rotationRateThreshold) {
if (fabs(userAcceleration.x) > accelerationThreshold || fabs(userAcceleration.y) > accelerationThreshold || fabs(userAcceleration.z) > accelerationThreshold) {
NSLog(@\"rotation rate = [Pitch: %f, Roll: %f, Yaw: %f]\", attitude.pitch, attitude.roll, attitude.yaw);
NSLog(@\"motion.rotationRate = %f\", rotationRate.x);
[self showMenuAnimated:YES];
}
}
else if ((-rotationRate.x) > rotationRateThreshold) {
if (fabs(userAcceleration.x) > accelerationThreshold || fabs(userAcceleration.y) > accelerationThreshold || fabs(userAcceleration.z) > accelerationThreshold) {
NSLog(@\"rotation rate = [Pitch: %f, Roll: %f, Yaw: %f]\", attitude.pitch, attitude.roll, attitude.yaw);
NSLog(@\"motion.rotationRate = %f\", rotationRate.x);
[self dismissMenuAnimated:YES];
}
}
}
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