Question

通过推送通知从终止状态打开时，我的应用程序崩溃。如果已启动应用程序，则效果很好，但是当应用程序被终止时，如果收到任何推送通知，而我点击它，它会使应用程序崩溃。我没有发现任何错误，有人可以帮助我解决这个问题吗？

如果我评论了UNUserNotificationCenter中didFinishLaunchingWithOptions中的AppDelegate.swift代码，则应用不会崩溃，但视图不会根据通知加载。我在推送通知中发送该网址，并检查它是否为空，然后将其加载为视图。

AppDelegate.swift

import UIKit
import UserNotifications

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

    var window: UIWindow?
    var apiUrl = "http://www.example.com/api/";

    func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
        let token = deviceToken.map { String(format: "%02.2hhx", $0) }.joined()
        // Device Registration with API
        deviceRegistration(token)
        //print("Token: \(token)")
    }

    func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) {

    }

    // Device Registration with API 
    func deviceRegistration(_ token: String) {
        let parameters = ["UUID": UIDevice.current.identifierForVendor!.uuidString, "Token": token, "DevOption": "Dev", "MID": "0"]
        let url = URL(string: apiUrl + "ios-register")!

        var request = URLRequest(url: url)
        request.httpMethod = "POST"
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")

        let httpBody = try? JSONSerialization.data(withJSONObject: parameters, options: [])
        request.httpBody = httpBody

        let session = URLSession.shared.dataTask(with: request) { (data, response, error) in
            if let data = data {
                do {
                    let json = try JSONSerialization.jsonObject(with: data, options: [])
                    print(json)
                } catch {
                }
            }
        }
        session.resume()
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert, .sound])
    }

    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        // Check User Tap the notification
        if let notification = response.notification.request.content.userInfo as? [String: AnyObject] {
            let message = parseRemoteNotification(notification: notification)

            guard let url = message?["url"] as? String else {
                return;
            }
            // If url exists then load the url
            if !(url.isEmpty) {
                loadView(url)
            }
        }
        completionHandler()
    }

    private func parseRemoteNotification(notification:[String:AnyObject]) -> NSDictionary? {
        if let aps = notification["aps"] as? [String:AnyObject] {
            let alert = aps["alert"] as? NSDictionary
            return alert
        }
        return nil
    }

    func loadView(_ url: String) {
        let data: [String: String] = ["url": url]
        NotificationCenter.default.post(name: NSNotification.Name("loadWebView"), object: nil, userInfo: data)
    }

    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.

        if let sb = UIApplication.shared.value(forKeyPath: "statusBarWindow.statusBar") as? UIView {
            sb.backgroundColor = UIColor.init(red: 252/255, green: 153/255, blue: 0/255, alpha: 1)
        }

        // Local Notification
        //if(application.applicationState == .active) {
            UNUserNotificationCenter.current().delegate = self
            UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .badge, .sound]) { (granted, error) in
                //print("Granted: \(granted)")
            }
        //}

        // Push Notifications
        UIApplication.shared.registerForRemoteNotifications()

        return true
    }

    func applicationWillResignActive(_ application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and invalidate graphics rendering callbacks. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(_ application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(_ application: UIApplication) {
        // Called as part of the transition from the background to the active state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(_ application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(_ application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

ViewControllwer.swift

import UIKit
import WebKit
import UserNotifications

class ViewController: UIViewController, WKNavigationDelegate {

    @IBOutlet var mWebKit: WKWebView!
    @IBOutlet var indicator: UIActivityIndicatorView!

    public var defaultUrl = "https://www.example.com";
    public var viewUrl = URL(string: "https://www.example.com")!

    override func viewDidLoad() {
        super.viewDidLoad()

        mWebKit.navigationDelegate = self
        self.mWebKit.addObserver(self, forKeyPath: "URL", options: .new, context: nil)
        self.mWebKit.addObserver(self, forKeyPath: "estimatedProgress", options: .new, context: nil)

        loadWebView(viewUrl)

        // On Notification Receive
        NotificationCenter.default.addObserver(forName: NSNotification.Name("loadWebView"), object: nil, queue: nil) { (Notification) in
            //print("notification is \(Notification)")
            let url = URL(string: Notification.userInfo?["url"] as? String ?? self.defaultUrl)
            self.loadWebView(url ?? self.viewUrl)
        }

        // Do any additional setup after loading the view, typically from a nib.
    }

    func loadWebView(_ url: URL) {
        var request = URLRequest(url: url)
        request.setValue("com.example.in", forHTTPHeaderField: "X-REQUESTED-WITH")
        self.mWebKit.load(request)
    }

    deinit {
        NotificationCenter.default.removeObserver(self)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning();
        // Dispose of any resources that can be recreated
    }

    override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
        if keyPath == #keyPath(WKWebView.url) {
            indicator.startAnimating()            
            loadWebView(self.mWebKit.url!)
        }

        if keyPath == #keyPath(WKWebView.estimatedProgress) {
            if(self.mWebKit.estimatedProgress == 1) {
                indicator.stopAnimating()
            }
        }
    }

}

Answer 1

在这里，我并不是在为您的答案发布实际的解决方案，而是在发布您可以debug完成代码的方式。因此，如果您能够保留断点并能够查看日志（使用打印方法），则可以轻松地找到背后的实际原因。

这是调试这种情况的方法。

转到edit scheme

现在，打开的屏幕在这里，从左侧菜单中选择Run。现在，从顶部菜单中选择Info标签。在这里，您会看到2个用于Launch情况的单选按钮。默认情况下将选择Automatically。将其更改为Wait for executable to be launched。然后关闭此屏幕。

现在，在设备中运行您的应用程序。它将在设备上安装您的应用程序，但不会像通常那样每次启动您的应用程序。
现在，发布您的推送通知，一旦收到通知，请单击它。当您单击它时，您的应用程序将启动，调试会话将启动，如果您的应用程序崩溃，则断点将自动在此处停止。否则，如果您的逻辑有任何问题，您可以在需要时通过放置断点以及添加“打印”日志来调试会话。

我认为通过执行上述操作，您将能够进行调试，并且一旦可以调试，就可以轻松地确定问题并找到解决方案。获得解决方案后，将以上设置更改回Automatically以正常启动您的应用程序。

通过“推送通知”将应用程序从终止状态打开时，iOS Web View App崩溃了

1 个答案: