通过 CoreMotion 检测摇动手势

Posted 2023-03-05

【中文标题】通过 CoreMotion 检测摇动手势

【英文标题】：Detecting Shake Gesture by CoreMotion

【发布时间】：2016-06-23 06:32:11

【问题描述】：

我想使用适用于 ios 7 的 coreMotion 框架检测设备抖动。谁能帮我解决这个问题？

我在 viewDidAppear 中编写了下面描述的代码

CMMotionManager *motionManager = [[CMMotionManager alloc] init];
    motionManager.deviceMotionUpdateInterval = 1.0/60.0;

__block double myAcceleration;
[motionManager startDeviceMotionUpdatesToQueue:[NSOperationQueue mainQueue]
                                   withHandler:^(CMDeviceMotion *motion, NSError *error)
 
     myAcceleration = motion.userAcceleration.y;
     CATransform3D transform;
     transform = CATransform3DMakeRotation(
                                           motion.attitude.pitch, 1, 0, 0);
     transform = CATransform3DRotate(transform,
                                     motion.attitude.roll, 0, 1, 0);
     transform = CATransform3DRotate(transform,
                                     motion.attitude.yaw, 0, 0, 1);
 
 ]; 

但未检测到抖动。

【问题讨论】：

嘿，如果有人知道在 ios 7 及更高版本中使用 core motion 进行摇动，请分享您的答案

【参考方案1】：

  #define accelerationThreshold  0.30

- (void)motionMethod:(CMDeviceMotion *)deviceMotion

 

 CMMotionManager *motionManager = [[CMMotionManager alloc] init];

    CMAcceleration userAcceleration = deviceMotion.userAcceleration;
    if (fabs(userAcceleration.x) > accelerationThreshold || fabs(userAcceleration.y) > accelerationThreshold || fabs(userAcceleration.z) > accelerationThreshold)
    
        float sensitivity = 1;
        float x1 = 0, x2 = 0, y1 = 0, y2 = 0, z1 = 0, z2 = 0;

        double totalAccelerationInXY = sqrt(userAcceleration.x * userAcceleration.x +
                                            userAcceleration.y * userAcceleration.y);

        if (0.85 < totalAccelerationInXY < 3.45) 
            x1 = userAcceleration.x;
            y1 = userAcceleration.y;
            z1 = userAcceleration.z;

            float change = fabs(x1-x2+y1-y2+z1-z2);
            if (sensitivity < change) 

              // print change in position in coordinates.
                NSLog (@"total=%f x=%f y=%f z=%f timeStamp:%f, UpTime:%f", totalAccelerationInXY, userAcceleration.x, userAcceleration.y, userAcceleration.z, deviceMotion.timestamp, [[NSProcessInfo processInfo] systemUptime]);

                x2 = x1;
                y2 = y1;
                z2 = z1;
            
        
    

【讨论】：

帮我检测 ios 设备的抖动。

【参考方案2】：

我知道它很旧，但我正在为可能感兴趣的其他人发帖。

此抖动检测代码也可以在没有 ViewController 或应用在后台时使用（只需使用 coremotion）

import CoreMotion

private var centralManager : CBCentralManager!

@IBOutlet weak var shakeLabel: UILabel!
let manager = CMMotionManager()

override func viewDidLoad() 
    super.viewDidLoad()

    var xInPositiveDirection = 0.0
    var xInNegativeDirection = 0.0
    var shakeCount = 0

    var tempVariable = 0

    manager.deviceMotionUpdateInterval = 0.02

    manager.startDeviceMotionUpdates(to: OperationQueue.main, withHandler: 
        (data, error) in


        if data!.userAcceleration.x > 1.0 || data!.userAcceleration.x < -1.0 



            if data!.userAcceleration.x > 1.0 
                xInPositiveDirection = data!.userAcceleration.x
            

            if data!.userAcceleration.x < -1.0 
                xInNegativeDirection = data!.userAcceleration.x
            

            if xInPositiveDirection != 0.0 && xInNegativeDirection != 0.0 
                shakeCount = shakeCount + 1
                xInPositiveDirection = 0.0
                xInNegativeDirection = 0.0
            

            if shakeCount > 5 
                tempVariable = tempVariable + 1
                self.shakeLabel.text = "Shaken! \(tempVariable)"
                shakeCount = 0
            

        
    )