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First part of background capabilities implementation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| // | ||
| // SessionCleaner.swift | ||
| // AirPrint | ||
| // | ||
| // Created by Danyl Timofeyev on 20.01.2022. | ||
| // | ||
|
|
||
| import Foundation | ||
| import BackgroundTasks | ||
| /// fire debug: | ||
| /// e -l objc -- (void)[[BGTaskScheduler sharedScheduler] _simulateLaunchForTaskWithIdentifier:@"com.surf.devip"] | ||
| class BackgroundScheduler { | ||
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|
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| static let shared = BackgroundScheduler() | ||
|
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| var taskProcess: VoidClosure? | ||
| var shouldRepeating: Bool = true | ||
|
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| private var taskIdentifierFromPlist: String! | ||
|
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| func register(taskIdentifier: String = "com.surf.devip") { | ||
| taskIdentifierFromPlist = taskIdentifier | ||
| BGTaskScheduler.shared.register(forTaskWithIdentifier: taskIdentifier, using: nil) { (task) in | ||
| self.handleAppRefreshTask(task: task as! BGAppRefreshTask) | ||
| } | ||
| } | ||
|
|
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| func handleAppRefreshTask(task: BGAppRefreshTask) { | ||
| task.expirationHandler = { | ||
| task.setTaskCompleted(success: false) | ||
| } | ||
| /// task process | ||
| //UserDefaults.standard.set("\(Date().timeIntervalSince1970)", forKey: "123") | ||
| taskProcess?() | ||
| /// | ||
| task.setTaskCompleted(success: true) | ||
| if shouldRepeating { | ||
| scheduleBackgroundFetch() | ||
| } | ||
| } | ||
|
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| func scheduleBackgroundFetch(in seconds: Double = 60) { | ||
| let task = BGAppRefreshTaskRequest(identifier: taskIdentifierFromPlist) | ||
| //task.earliestBeginDate = Date(timeIntervalSinceNow: seconds) | ||
| do { | ||
| try BGTaskScheduler.shared.submit(task) | ||
| } catch { | ||
| Logger.log("Unable to submit task: \(error.localizedDescription)", type: .error) | ||
| Logger.logError(error) | ||
| } | ||
| } | ||
|
|
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| func cancelPendingTask() { | ||
| BGTaskScheduler.shared.cancelAllTaskRequests() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,62 @@ | ||
| // | ||
| // BackgroundTimer.swift | ||
| // AirPrint | ||
| // | ||
| // Created by Danyl Timofeyev on 19.01.2022. | ||
| // | ||
|
|
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| import Foundation | ||
|
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| class BackgroundTimer { | ||
|
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| let timeInterval: TimeInterval | ||
|
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| init(timeInterval: TimeInterval) { | ||
| self.timeInterval = timeInterval | ||
| } | ||
|
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| private lazy var timer: DispatchSourceTimer = { | ||
| let t = DispatchSource.makeTimerSource() | ||
| t.schedule(deadline: .now() + self.timeInterval, repeating: self.timeInterval) | ||
| t.setEventHandler(handler: { [weak self] in | ||
| self?.eventHandler?() | ||
| }) | ||
| return t | ||
| }() | ||
|
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| var eventHandler: (() -> Void)? | ||
|
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| private enum State { | ||
| case suspended | ||
| case resumed | ||
| } | ||
|
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| private var state: State = .suspended | ||
|
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| deinit { | ||
| timer.setEventHandler {} | ||
| timer.cancel() | ||
| /* | ||
| If the timer is suspended, calling cancel without resuming | ||
| triggers a crash. This is documented here https://forums.developer.apple.com/thread/15902 | ||
| */ | ||
| resume() | ||
| eventHandler = nil | ||
| } | ||
|
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| func resume() { | ||
| if state == .resumed { | ||
| return | ||
| } | ||
| state = .resumed | ||
| timer.resume() | ||
| } | ||
|
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| func suspend() { | ||
| if state == .suspended { | ||
| return | ||
| } | ||
| state = .suspended | ||
| timer.suspend() | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| // | ||
| // TaskBackgroundKeeper.swift | ||
| // AirPrint | ||
| // | ||
| // Created by Danyl Timofeyev on 19.01.2022. | ||
| // | ||
|
|
||
| import Foundation | ||
|
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| class TaskBackgroundKeeper { | ||
| private var backgroundTaskId: UIBackgroundTaskIdentifier? | ||
| private var taskName: String = "task-that-should-continue-runing-in-background" | ||
| private var queue = DispatchQueue.global(qos: .background) | ||
|
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| func executeAfterDelay(delay: TimeInterval, completion: @escaping (() -> Void)) { | ||
| backgroundTaskId = UIApplication.shared.beginBackgroundTask( | ||
| withName: taskName, | ||
| expirationHandler: { [weak self] in | ||
| if let taskId = self?.backgroundTaskId { | ||
| UIApplication.shared.endBackgroundTask(taskId) | ||
| } | ||
| }) | ||
| let startTime = Date() | ||
| queue.async { | ||
| while Date().timeIntervalSince(startTime) < delay { | ||
| Thread.sleep(forTimeInterval: 1) //0.01) | ||
| } | ||
| DispatchQueue.main.async { [weak self] in | ||
| completion() | ||
| if let taskId = self?.backgroundTaskId { | ||
| UIApplication.shared.endBackgroundTask(taskId) | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } |