session-ios/SignalMessaging/utils/ProximityMonitoringManager.swift

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//
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// Copyright (c) 2019 Open Whisper Systems. All rights reserved.
//
@objc
public protocol OWSProximityMonitoringManager: class {
func add(lifetime: AnyObject)
func remove(lifetime: AnyObject)
}
@objc
public class OWSProximityMonitoringManagerImpl: NSObject, OWSProximityMonitoringManager {
var lifetimes: [Weak<AnyObject>] = []
public override init() {
super.init()
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AppReadiness.runNowOrWhenAppWillBecomeReady {
self.setup()
}
}
// MARK:
var device: UIDevice {
return UIDevice.current
}
// MARK:
@objc
public func add(lifetime: AnyObject) {
objc_sync_enter(self)
if !lifetimes.contains { $0.value === lifetime } {
lifetimes.append(Weak(value: lifetime))
}
reconcile()
objc_sync_exit(self)
}
@objc
public func remove(lifetime: AnyObject) {
objc_sync_enter(self)
lifetimes = lifetimes.filter { $0.value !== lifetime }
reconcile()
objc_sync_exit(self)
}
@objc
public func setup() {
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NotificationCenter.default.addObserver(self, selector: #selector(proximitySensorStateDidChange(notification:)), name: UIDevice.proximityStateDidChangeNotification, object: nil)
}
@objc
func proximitySensorStateDidChange(notification: Notification) {
Logger.debug("")
// This is crazy, but if we disable `device.isProximityMonitoringEnabled` while
// `device.proximityState` is true (while the device is held to the ear)
// then `device.proximityState` remains true, even after we bring the phone
// away from the ear and re-enable monitoring.
//
// To resolve this, we wait to disable proximity monitoring until `proximityState`
// is false.
if self.device.proximityState {
self.add(lifetime: self)
} else {
self.remove(lifetime: self)
}
}
func reconcile() {
lifetimes = lifetimes.filter { $0.value != nil }
if lifetimes.isEmpty {
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DispatchQueue.main.async {
Logger.debug("disabling proximity monitoring")
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self.device.isProximityMonitoringEnabled = false
}
} else {
let lifetimes = self.lifetimes
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DispatchQueue.main.async {
Logger.debug("willEnable proximity monitoring for lifetimes: \(lifetimes), proximityState: \(self.device.proximityState)")
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self.device.isProximityMonitoringEnabled = true
Logger.debug("didEnable proximity monitoring for lifetimes: \(lifetimes), proximityState: \(self.device.proximityState)")
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}
}
}
}