tilttowake.swift

    /// This method will start a timer to either "wake" the device or put it to sleep if it is in the right orientation.
    /// On a timer because the real device seems to delay it by a bit.
    func handleDeviceMotion(motion: CMDeviceMotion) {
        // device is tilted up
        if motion.attitude.pitch > 0.5 {
            if tiltActionTimer == nil {
                tiltActionTimer = Timer.scheduledTimer(withTimeInterval: 0.5, repeats: false, block: { (_) in
                    if self.passcodeViewMode == .inactive {
                        self.setPasscodeViewMode(.lockedScreen)
                    }
                    self.tiltActionTimer = nil
                })
            }

        } else { //device is tilted down
            if passcodeViewMode == .lockedScreen {
                //delay switching to inactive mode for a sec
                if tiltActionTimer == nil {
                    tiltActionTimer = Timer.scheduledTimer(withTimeInterval: 3.0, repeats: false, block: { (_) in
                        if self.passcodeViewMode == .lockedScreen { //we could've gone to the passcode entry at this point
                            self.setPasscodeViewMode(.inactive)
                        }
                        self.tiltActionTimer = nil
                    })
                }
            }
        }
    }