e459223e39
* Fix `UIApplication.shared` after moving to SwiftUI app * Do not autoplay videos on background * Move app state changes into the app coordinator * Add application background task, move into the suspended state more accurately * Add changelog * Fix most of the linter errors * Strip suspended state from state machine * Fix build * Clear audio session warning * Update AppCoordinator.swift * Update AppCoordinator.swift * Swift format
106 lines
3.1 KiB
Swift
106 lines
3.1 KiB
Swift
//
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// Copyright 2022 New Vector Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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import Foundation
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import UIKit
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/// UIKitBackgroundTask is a concrete implementation of BackgroundTaskProtocol using UIApplication background task.
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class UIKitBackgroundTask: BackgroundTaskProtocol {
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let name: String
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var isRunning: Bool {
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identifier != .invalid
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}
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let isReusable: Bool
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let expirationHandler: BackgroundTaskExpirationHandler?
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var elapsedTime: TimeInterval {
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Date().timeIntervalSince(startDate) * 1000
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}
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private let application: ApplicationProtocol
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private var identifier: UIBackgroundTaskIdentifier = .invalid
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private var useCounter = 0
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private let startDate = Date()
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/// Initializes and starts a new background task
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/// - Parameters:
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/// - name: name
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/// - isReusable: flag indicating the task is reusable
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/// - application: application instance
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/// - expirationHandler: expiration handler
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init?(name: String,
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isReusable: Bool,
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application: ApplicationProtocol,
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expirationHandler: BackgroundTaskExpirationHandler?) {
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self.name = name
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self.isReusable = isReusable
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self.application = application
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self.expirationHandler = expirationHandler
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// attempt to start
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identifier = application.beginBackgroundTask(withName: name) { [weak self] in
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guard let self else { return }
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self.stop()
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self.expirationHandler?(self)
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}
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if identifier == .invalid {
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MXLog.verbose("Do not start background task: \(name), as OS declined")
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// call expiration handler immediately
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expirationHandler?(self)
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return nil
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}
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if isReusable {
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// creation itself is a use
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reuse()
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}
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MXLog.verbose("Start background task #\(identifier.rawValue) - \(name)")
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}
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func reuse() {
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guard isReusable else {
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return
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}
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useCounter += 1
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}
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func stop() {
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if isReusable {
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useCounter -= 1
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if useCounter <= 0 {
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endTask()
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}
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} else {
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endTask()
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}
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}
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private func endTask() {
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if identifier != .invalid {
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MXLog.verbose("End background task #\(identifier.rawValue) - \(name) after \(readableElapsedTime)")
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application.endBackgroundTask(identifier)
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identifier = .invalid
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}
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}
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private var readableElapsedTime: String {
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String(format: "%.3fms", elapsedTime)
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}
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}
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