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https://github.com/flutter/flutter.git
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f6c154c39c
Improve Swift usage in platform_channel_swift some more Make a bunch of changes that willlarche requested in https://github.com/flutter/flutter/pull/21712: * Use `static let` within `enum` namespaces for String constants. * Use `guard` for early exits and to avoid forced unwrapping. * Explicitly qualify a selector. * Fix a retain cycle by using a weak reference.
104 lines
3.3 KiB
Swift
104 lines
3.3 KiB
Swift
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import UIKit
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import Flutter
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enum ChannelName {
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static let battery = "samples.flutter.io/battery"
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static let charging = "samples.flutter.io/charging"
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}
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enum BatteryState {
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static let charging = "charging"
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static let discharging = "discharging"
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}
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enum MyFlutterErrorCode {
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static let unavailable = "UNAVAILABLE"
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}
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@UIApplicationMain
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@objc class AppDelegate: FlutterAppDelegate, FlutterStreamHandler {
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private var eventSink: FlutterEventSink?
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override func application(
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_ application: UIApplication,
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didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
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GeneratedPluginRegistrant.register(with: self)
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guard let controller = window?.rootViewController as? FlutterViewController else {
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fatalError("rootViewController is not type FlutterViewController")
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}
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let batteryChannel = FlutterMethodChannel(name: ChannelName.battery,
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binaryMessenger: controller)
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batteryChannel.setMethodCallHandler({
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[weak self] (call: FlutterMethodCall, result: FlutterResult) -> Void in
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guard call.method == "getBatteryLevel" else {
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result(FlutterMethodNotImplemented)
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return
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}
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self?.receiveBatteryLevel(result: result)
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})
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let chargingChannel = FlutterEventChannel(name: ChannelName.charging,
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binaryMessenger: controller)
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chargingChannel.setStreamHandler(self)
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return super.application(application, didFinishLaunchingWithOptions: launchOptions)
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}
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private func receiveBatteryLevel(result: FlutterResult) {
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let device = UIDevice.current
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device.isBatteryMonitoringEnabled = true
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guard device.batteryState != .unknown else {
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result(FlutterError(code: MyFlutterErrorCode.unavailable,
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message: "Battery info unavailable",
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details: nil))
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return
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}
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result(Int(device.batteryLevel * 100))
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}
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public func onListen(withArguments arguments: Any?,
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eventSink: @escaping FlutterEventSink) -> FlutterError? {
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self.eventSink = eventSink
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UIDevice.current.isBatteryMonitoringEnabled = true
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sendBatteryStateEvent()
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(AppDelegate.onBatteryStateDidChange),
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name: NSNotification.Name.UIDeviceBatteryStateDidChange,
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object: nil)
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return nil
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}
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@objc private func onBatteryStateDidChange(notification: NSNotification) {
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sendBatteryStateEvent()
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}
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private func sendBatteryStateEvent() {
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guard let eventSink = eventSink else {
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return
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}
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switch UIDevice.current.batteryState {
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case .full:
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eventSink(BatteryState.charging)
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case .charging:
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eventSink(BatteryState.charging)
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case .unplugged:
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eventSink(BatteryState.discharging)
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default:
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eventSink(FlutterError(code: MyFlutterErrorCode.unavailable,
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message: "Charging status unavailable",
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details: nil))
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}
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}
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public func onCancel(withArguments arguments: Any?) -> FlutterError? {
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NotificationCenter.default.removeObserver(self)
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eventSink = nil
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return nil
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}
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}
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