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// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
import UIKit
import Flutter
enum ChannelName {
static let battery = "samples.flutter.io/battery"
static let charging = "samples.flutter.io/charging"
}
enum BatteryState {
static let charging = "charging"
static let discharging = "discharging"
}
enum MyFlutterErrorCode {
static let unavailable = "UNAVAILABLE"
}
@UIApplicationMain
@objc class AppDelegate: FlutterAppDelegate, FlutterStreamHandler {
private var eventSink: FlutterEventSink?
override func application(
_ application: UIApplication,
didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
GeneratedPluginRegistrant.register(with: self)
guard let controller = window?.rootViewController as? FlutterViewController else {
fatalError("rootViewController is not type FlutterViewController")
}
let batteryChannel = FlutterMethodChannel(name: ChannelName.battery,
binaryMessenger: controller.binaryMessenger)
batteryChannel.setMethodCallHandler({
[weak self] (call: FlutterMethodCall, result: FlutterResult) -> Void in
guard call.method == "getBatteryLevel" else {
result(FlutterMethodNotImplemented)
return
}
self?.receiveBatteryLevel(result: result)
})
let chargingChannel = FlutterEventChannel(name: ChannelName.charging,
binaryMessenger: controller.binaryMessenger)
chargingChannel.setStreamHandler(self)
return super.application(application, didFinishLaunchingWithOptions: launchOptions)
}
private func receiveBatteryLevel(result: FlutterResult) {
let device = UIDevice.current
device.isBatteryMonitoringEnabled = true
guard device.batteryState != .unknown else {
result(FlutterError(code: MyFlutterErrorCode.unavailable,
message: "Battery info unavailable",
details: nil))
return
}
result(Int(device.batteryLevel * 100))
}
public func onListen(withArguments arguments: Any?,
eventSink: @escaping FlutterEventSink) -> FlutterError? {
self.eventSink = eventSink
UIDevice.current.isBatteryMonitoringEnabled = true
sendBatteryStateEvent()
NotificationCenter.default.addObserver(
self,
selector: #selector(AppDelegate.onBatteryStateDidChange),
name: UIDevice.batteryStateDidChangeNotification,
object: nil)
return nil
}
@objc private func onBatteryStateDidChange(notification: NSNotification) {
sendBatteryStateEvent()
}
private func sendBatteryStateEvent() {
guard let eventSink = eventSink else {
return
}
switch UIDevice.current.batteryState {
case .full:
eventSink(BatteryState.charging)
case .charging:
eventSink(BatteryState.charging)
case .unplugged:
eventSink(BatteryState.discharging)
default:
eventSink(FlutterError(code: MyFlutterErrorCode.unavailable,
message: "Charging status unavailable",
details: nil))
}
}
public func onCancel(withArguments arguments: Any?) -> FlutterError? {
NotificationCenter.default.removeObserver(self)
eventSink = nil
return nil
}
}