读书笔记---陀螺仪

加速度计只能测量设备上的线性加速度,设备的倾斜,偏转,旋转加速度计无法测量到,这需要使用陀螺仪,陀螺仪又叫角加速度传感器.

陀螺仪在代码上和加速度计差不多,直接贴代码

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    self.motionManager = [[CMMotionManager alloc] init];
    self.motionManager.gyroUpdateInterval = 0.1;//设置读取时间
    
    if ([self.motionManager isGyroAvailable]){//判断是否可用
        
        [self.motionManager startGyroUpdatesToQueue:[NSOperationQueue mainQueue]
            withHandler:^(CMGyroData *gyroData, NSError *error) {
            
            if (error) {
                [self.motionManager stopGyroUpdates];//关闭读取
            } else {
                CMRotationRate rotate = gyroData.rotationRate;
                
                NSLog(@"x=%f", rotate.x);
                self.xLabel.text = [NSString stringWithFormat:@"%f", rotate.x];
                self.xBar.progress = ABS(rotate.x);
                
                NSLog(@"y=%f", rotate.y);
                self.yLabel.text = [NSString stringWithFormat:@"%f", rotate.y];
                self.yBar.progress = ABS(rotate.y);
                
                NSLog(@"z=%f", rotate.z);
                self.zLabel.text = [NSString stringWithFormat:@"%f", rotate.z];
                self.zBar.progress = ABS(rotate.z);
            }
        }];
    } else {
        NSLog(@"Gyroscope is not available.");
    }    
    
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    [self.motionManager stopGyroUpdates];    
}

检测晃动设备

运动事件的检测方法和触摸事件类似,都是继承了UIResponder

-(void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event
-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event
-(void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event

- (void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    if (motion == UIEventSubtypeMotionShake) {
        self.label.text = @"晃动开始";
    }
}

- (void)motionEnded:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    if (motion == UIEventSubtypeMotionShake) {
        self.label.text = @"晃动结束";
    }
}

- (void)motionCancelled:(UIEventSubtype)motion withEvent:(UIEvent *)event{
    if (motion == UIEventSubtypeMotionShake) {
        self.label.text = @"晃动取消";
    }
}

typedef NS_ENUM(NSInteger, UIEventSubtype) {
    // available in iPhone OS 3.0
    UIEventSubtypeNone                              = 0,
    
    // for UIEventTypeMotion, available in iPhone OS 3.0
    UIEventSubtypeMotionShake                       = 1,
    
    // for UIEventTypeRemoteControl, available in iOS 4.0
    UIEventSubtypeRemoteControlPlay                 = 100,
    UIEventSubtypeRemoteControlPause                = 101,
    UIEventSubtypeRemoteControlStop                 = 102,
    UIEventSubtypeRemoteControlTogglePlayPause      = 103,
    UIEventSubtypeRemoteControlNextTrack            = 104,
    UIEventSubtypeRemoteControlPreviousTrack        = 105,
    UIEventSubtypeRemoteControlBeginSeekingBackward = 106,
    UIEventSubtypeRemoteControlEndSeekingBackward   = 107,
    UIEventSubtypeRemoteControlBeginSeekingForward  = 108,
    UIEventSubtypeRemoteControlEndSeekingForward    = 109,
};

其中

UIEventSubtypeNone代表触摸事件,UIEventSubtypeMotionShake代表晃动事件,UIEventSubtypeRemoteControlPlay与UIEventSubtypeRemoteControlEndSeekingForward代表多媒体远程控制事件

简单来说,这章只是很浅的告诉了我们什么是加速度计与陀螺仪,但商用的话我想还需要更多的探索,大家可以自行去网上google

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