Swift:忽略启动新后台任务的请求，因为 RunningBoard 已经启动了到期计时器

Question

我有一系列由静默推送通知触发的任务。收到推送通知后，它会在后台唤醒 iOS 并执行以下任务:

打开一个包含 WKWebview 的 WebViewController

进入网页，点击一些由 javascript 注入(inject)自动生成的按钮

完成后，关闭 WebViewController

我已经添加了选定的 BackgroundTasks 处理程序来管理它，方法如下 tutorial但控制台充斥着以下警告。

[ProcessSuspension] 0x280486080 - WKProcessAssertionBackgroundTaskManager: Ignored request to start a new background task because RunningBoard has already started the expiration timer

请注意，需要完成的任务仍然正确执行。

class WebViewController: UIViewController, WKNavigationDelegate, WKScriptMessageHandler {

    lazy var webView: WKWebView = {
        let v = WKWebView()
        v.translatesAutoresizingMaskIntoConstraints = false
        v.navigationDelegate = self
        return v
    }()
    
    var backgroundTask: UIBackgroundTaskIdentifier = .invalid
    
    //Remove BG task when not needed
    deinit {
        NotificationCenter.default.removeObserver(self)
        endBackgroundTask()
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //Register notification for background task
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(reinstateBackgroundTask),
                                               name: UIApplication.didBecomeActiveNotification,
                                               object: nil)
        registerBackgroundTask()

        
        //Load webview with  URL
        if let url = url {
            let request = URLRequest(url: url)
            webView.load(request)
        }
    }
    
    //MARK:- Handle BG Tasks
    
    func registerBackgroundTask() {
        backgroundTask = UIApplication.shared.beginBackgroundTask { [weak self] in
            self?.endBackgroundTask()
        }
    }
    
    func endBackgroundTask() {
        Log("Background task ended.")
        UIApplication.shared.endBackgroundTask(backgroundTask)
        backgroundTask = .invalid
    }
    
    @objc func reinstateBackgroundTask() {
        if backgroundTask == .invalid {
            registerBackgroundTask()
        }
    }
    
    func endBackgroundTaskIfNotInvalid() {
        if backgroundTask != .invalid {
            self.endBackgroundTask()
        }
    }
    
    //This is the final task that needs to be done 
    fileprivate func updateScheduler(visitedPlace: VisitedPlace) {
        if navigator == .scheduler {
            
            if let jobId = jobId {
                let data = [
                    "status": "scheduled",
                    "completedOn": Date()
                ] as [String : Any]
                
                ///Do some work here...
                    
                //Dismiss controller after completing
                self.dismiss(animated: true) {
                    self.endBackgroundTaskIfNotInvalid()
                }
            }
        } else {
            self.endBackgroundTaskIfNotInvalid()
        }
    }
}

是什么触发了所有这些警告，我该如何使其静音？

Answer 1

我有同样的控制台泛滥。对我来说，结果是 adMob 导致的。