iOS CoreMotion重力感应

系统提供CMMotionManager获取感应数据，startDeviceMotionUpdatesToQueue方法被动获取数据，可以设置采集数据的间隔

#import "CoreMotionViewController.h"
#import <CoreMotion/CoreMotion.h>

@interface CoreMotionViewController ()

@property (nonatomic, strong)CMMotionManager *motionManager;

@property (nonatomic, strong)UIImageView *carImg;

@property (nonatomic, strong)UIImageView *roadView;

@end

@implementation CoreMotionViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    [self setCoreMotionManager];
}

- (void)setCoreMotionManager {
    self.roadView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, UI_SCREEN_WIDTH, UI_SCREEN_HEIGHT)];
    self.roadView.center = self.view.center;
    self.roadView.image = [UIImage imageNamed:@"road"];
    self.roadView.contentMode = UIViewContentModeScaleAspectFill;
    self.roadView.clipsToBounds = YES;
    [self.view addSubview:self.roadView];
    
    self.carImg = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, kScaleX*64, kScaleY*64)];
    self.carImg.image = [UIImage imageNamed:@"car"];
    self.carImg.center = CGPointMake(self.view.frame.size.width/2, self.view.frame.size.height - kScaleY*30 - self.carImg.frame.size.height/2);
    [self.roadView addSubview:self.carImg];
    
    self.motionManager = [[CMMotionManager alloc]init];
    self.motionManager.deviceMotionUpdateInterval = 1/5;//设置采样间隔

    [self.motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue currentQueue] withHandler:^(CMDeviceMotion * _Nullable motion, NSError * _Nullable error) {
        //根据motion.attitude.roll调整小车位置
        [self moveCarWithMotionRoll:motion.attitude.roll];
    }];
}

- (void)moveCarWithMotionRoll:(CGFloat)roll {
    [UIView animateWithDuration:0.2 animations:^{
        if (roll < 0) {
            self.carImg.center = CGPointMake(self.roadView.frame.size.width/4, self.carImg.center.y);
        }else {
            self.carImg.center = CGPointMake(self.roadView.frame.size.width/4*3, self.carImg.center.y);
        }
    }];
}

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