Question

到目前为止，在我的代码中，当接近传感器启用时，我可以打开手电筒灯，但是我无法调整我的代码，以便在禁用接近时，手电筒指示灯熄灭。

func proximityChanged(notification: NSNotification) {
    if let device = notification.object as? UIDevice {
    print("\(device) detected!")
    toggleTorch(on: true)
    } else { 
//This is the line of code I need help with specifically.
        toggleTorch(on: false)
    }
}

func activateProximitySensor() {
    let device = UIDevice.currentDevice()
    device.proximityMonitoringEnabled = true
    if device.proximityMonitoringEnabled {
        NSNotificationCenter.defaultCenter().addObserver(self, selector: "proximityChanged:", name: "UIDeviceProximityStateDidChangeNotification", object: device)

    }
}

func toggleTorch(on on: Bool) {
    let device = AVCaptureDevice.defaultDeviceWithMediaType(AVMediaTypeVideo)

    if device.hasTorch {
        do {
            try device.lockForConfiguration()

            if on == true {
                device.torchMode = .On
            } else {
                device.torchMode = .Off
            }

            device.unlockForConfiguration()
        } catch { 
            print("Torch could not be used")
        }
    } else {
        print("Torch is not available")
    }
}

Answer 1

通知中的std::cin.clear 始终是UIDevice，因此您的测试毫无意义。问题是您没有检查用户是否接近。收到对设备的引用后，您需要检查其object属性; 是您测试所需的基础。

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1 个答案: