如何实现iPhone的重力感应还有旋转感应，也就是术语上的陀螺仪和加速器？下面我们来用一个简单的Demo入门一下吧！

由于模拟器上不能运行这个，所以只能贴出代码，没有截图。

ViewController.h:

#import  @interface BIDViewController : UIViewController @property (weak, nonatomic) IBOutlet UILabel *accelerometerLabel; @property (weak, nonatomic) IBOutlet UILabel *gyroscopeLabel; @end

ViewController.m:

#import "BIDViewController.h" #import   @interface BIDViewController () @property (strong, nonatomic) CMMotionManager *motionManager; @property (strong, nonatomic) NSOperationQueue *queue; @end  @implementation BIDViewController  - (NSUInteger)supportedInterfaceOrientations {     return UIInterfaceOrientationMaskPortrait; }  - (void)viewDidLoad {     [super viewDidLoad]; 	// Do any additional setup after loading the view, typically from a nib.          self.motionManager = [[CMMotionManager alloc] init];     self.queue = [[NSOperationQueue alloc] init];          if (self.motionManager.accelerometerAvailable) {                  self.motionManager.accelerometerUpdateInterval = 1.0 / 10.0;                  [self.motionManager startAccelerometerUpdatesToQueue:self.queue                                                  withHandler:          ^(CMAccelerometerData *accelerometerData, NSError *error) {                           NSString *labelText;             labelText = [NSString stringWithFormat:                         @"Accelerometer\n-----------\nx: %+.2f\ny: %+.2f\nz: %+.2f",                         accelerometerData.acceleration.x,                         accelerometerData.acceleration.y,                         accelerometerData.acceleration.z];              NSLog(@"%@",labelText);           }];     } else {         self.accelerometerLabel.text = @"This device has no accelerometer.";     }     if (self.motionManager.gyroAvailable) {         self.motionManager.gyroUpdateInterval = 1.0 / 10.0;         [self.motionManager startGyroUpdatesToQueue:self.queue withHandler:          ^(CMGyroData *gyroData, NSError *error) {                            NSString *labelText;             labelText = [NSString stringWithFormat:                         @"Gyroscope\n--------\nx: %+.2f\ny: %+.2f\nz: %+.2f",                         gyroData.rotationRate.x,                         gyroData.rotationRate.y,                         gyroData.rotationRate.z];              NSLog(@"%@",labelText);           }];     } else {         self.gyroscopeLabel.text = @"This device has no gyroscope";     } }   @end

切记要导入CoreMotion.framework框架