有没有办法像"raise to speak"功能一样监控用户对iPhone的移动？

Question

我想在用户将iphone举到他面前时得到通知。就像siri一样。这可能吗?

添加更具体的要求:当用户把手机放在耳朵附近时，我想让屏幕变暗。我知道接近传感器可以实现这一点。但令人讨厌的是，当用户在传感器上移动手指时，屏幕会不时变暗。所以我想知道如何避免这种情况，只有当用户举起iphone说话时屏幕才变暗?

Answer 1

参见UIDevice类参考中的使用接近传感器。你:

• 启用它:

  UIDevice *device = [UIDevice currentDevice];
  device.proximityMonitoringEnabled = YES;
  

• 检查是否成功启用;如果成功，观察UIDeviceProximityStateDidChangeNotification通知;否则，您的设备可能无法:

  if (device.proximityMonitoringEnabled)
  {
      [[NSNotificationCenter defaultCenter] addObserver:self
                                               selector:@selector(handleProximityChange:)
                                                   name:UIDeviceProximityStateDidChangeNotification
                                                 object:nil];
  }
  else
  {
       // device not capable
  }
  

• 写你的选择器:

  - (void)handleProximityChange:(NSNotification *)notification
  {
      NSLog(@"%s proximityState=%d", __FUNCTION__, [[UIDevice currentDevice] proximityState]);
  }
  

---

为了检测用户是否将其举到他们的脸上，我可能会将接近传感器与CMMotionManager结合，并查看gravity属性，以查看他们是否几乎垂直地拿着手机。因此，定义一些类属性:

@property (nonatomic, strong) CMMotionManager *motionManager;
@property (nonatomic, strong) NSOperationQueue *deviceQueue;

然后您可以启动CMMotionManager，查找设备是否保持在垂直位置:

self.deviceQueue = [[NSOperationQueue alloc] init];
self.motionManager = [[CMMotionManager alloc] init];
self.motionManager.deviceMotionUpdateInterval = 5.0 / 60.0;
UIDevice *device = [UIDevice currentDevice];
[self.motionManager startDeviceMotionUpdatesUsingReferenceFrame:CMAttitudeReferenceFrameXArbitraryZVertical
                                                        toQueue:self.deviceQueue
                                                    withHandler:^(CMDeviceMotion *motion, NSError *error)
{
    BOOL vertical = (motion.gravity.z > -0.4 && motion.gravity.z < 0.4 & motion.gravity.y < -0.7);
    if ((vertical && !device.proximityMonitoringEnabled) || (!vertical && device.proximityMonitoringEnabled))
    {
        device.proximityMonitoringEnabled = vertical;
    }
}];

这些gravity阈值是否有意义有点主观。除此之外，你还可以查看其他加速计数据(游戏邦注:例如，它们是否抬高了物体)，而不是仅仅查看手机是否大致垂直握住。似乎有很多方法可以剥掉猫的皮。

Answer 2

我知道这是旧的，但我简化了一点逻辑，并在Swift中做了一个包装器类。

你可以在这里找到

class DeviceRaisedToEarListener: NSObject {
private let deviceQueue = NSOperationQueue()
private let motionManager = CMMotionManager()
private var vertical: Bool = false
private(set) var isRaisedToEar: Bool = false {
    didSet {
        if oldValue != self.isRaisedToEar {
            self.stateChanged?(isRaisedToEar: self.isRaisedToEar)
        }
    }
}
var stateChanged:((isRaisedToEar: Bool)->())? = nil
override init() {
    super.init()
    self.setupMotionManager()
}
private func setupMotionManager() {
    self.motionManager.deviceMotionUpdateInterval = 5.0 / 60.0
    let device = UIDevice.currentDevice()
    // Only listen for proximity changes if the device is held vertically
    self.motionManager.startDeviceMotionUpdatesUsingReferenceFrame(CMAttitudeReferenceFrame.XArbitraryZVertical, toQueue: self.deviceQueue) { (motion, error) in
        self.vertical = (motion.gravity.z > -0.4 && motion.gravity.z < 0.4 && motion.gravity.y < -0.7)
    }
}
func startListening() {
    UIDevice.currentDevice().proximityMonitoringEnabled = true
    NSNotificationCenter.defaultCenter().addObserver(self, selector: "handleProximityChange:", name: UIDeviceProximityStateDidChangeNotification, object: nil)
}
func stopListening() {
    UIDevice.currentDevice().proximityMonitoringEnabled = false
    NSNotificationCenter.defaultCenter().removeObserver(self)
}
func handleProximityChange(notification: NSNotification) {
    self.isRaisedToEar = UIDevice.currentDevice().proximityState && self.vertical
}
deinit {
    self.stopListening()
}
}

// How to use:
private func setupRaiseListener() {
    self.deviceListener.stateChanged = { [weak self] isRaisedToEar in
      println("is raised? (isRaisedToEar)")
    }
    self.deviceListener.startListening()
}