分享一篇NSHipster的CMDeviceMotion

 关于CoreMotion的一些基本用法，比较实在；

1,Adding the Accelerometer

 

Using the Accelerometer

 

UIImageViewRotationViewController * __weak weakSelf = self;

if (manager.accelerometerAvailable) {

    manager.accelerometerUpdateInterval = 0.01f;

    [manager startAccelerometerUpdatesToQueue:[NSOperationQueue mainQueue]

                              withHandler:^(CMAccelerometerData *data, NSError *error) {

        double rotation = atan2(data.acceleration.x, data.acceleration.y) - M_PI;

        weakSelf.imageView.transform = CGAffineTransformMakeRotation(rotation);

    }];

}

 

CMAccelerometerDataxyz(0, -1, 0)(0, 0, -1)(0.707, -0.707, 0) of the  and  components from the accelerometer data and then using that rotation in a . Our image should stay right-side up no matter how the phone is turned—here it is in a hypothetical app for the National Air & Space Museum

 

could

2,Adding the Gyroscope

startGyroUpdates...anddeviceMotionCMDeviceMotion

RotationViewController * __weak weakSelf = self;

if (manager.deviceMotionAvailable) {

    manager.deviceMotionUpdateInterval = 0.01f;

    [manager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue]

                                       withHandler:^(CMDeviceMotion *data, NSError *error) {

        double rotation = atan2(data.gravity.x, data.gravity.y) - M_PI;

        weakSelf.imageView.transform = CGAffineTransformMakeRotation(rotation);

    }];

}

 

 

UIClunkController

userAccelerationCMDeviceMotionuserObjective-C

* = ; (.) { . = 0.01f; [ :[ ] :^( *, *) { (.. < -2.5fweakSelfnavigationControllerpopViewControllerAnimatedYES]; } }]; }