Question

UNUserNotificationCenterDelegate从后台删除时不起作用。当应用程序停留在前景和背景中时，它工作正常。

这里是代码

extension AppDelegate: UNUserNotificationCenterDelegate {

    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) {


        let rootViewController = self.window!.rootViewController as! UINavigationController
        let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let profileViewController = mainStoryboard.instantiateViewController(withIdentifier: "SampleViewController") as! SampleViewController
        rootViewController.pushViewController(profileViewController, animated: true)

        completionHandler()
    }
}

从后台删除应用程序时，未调用方法。请帮帮我

Answer 1

将UserNotifications框架添加到项目中时，需要检查以下5件事：

1）如果要处理远程通知，请确保已在Xcode项目的功能设置页面中启用了该功能。

请参见figure 1

如果这给您带来错误，则可能需要登录到Apple开发人员帐户并使用推送通知凭据创建密钥。最终结果为您提供一个.p8文件进行下载。创建此文件将清除错误。在将推送通知发送到您的应用程序/设备的服务器上，文件本身是必需的。如果您需要帮助，请查看此tutorial。

2）将导入行添加到AppDelegate文件的顶部

import UserNotifications

3）将UNUserNotificationCenterDelegate添加到您的AppDelegate类声明行。

class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {...

4）在application：didFinishLaunchingWithOptions方法中将UNUserNotificationCenter委托设置为self。

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    //...
    UNUserNotificationCenter.current().delegate = self
    //...
    return true
}

5）添加您的委托函数（如果您想使用它们）

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    NSLog("Application delegate method userNotificationCenter:didReceive:withCompletionHandler: is called with user info: %@", response.notification.request.content.userInfo)
    //...
}

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

希望有帮助。

Answer 2

检查didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]?方法。当用户点击通知横幅（并且该应用终止）时，该应用将启动，该方法将被调用，并且launchOptions包含通知信息。因此，您可以通过点击通知横幅来了解（通过检查launchOptions）该应用程序已启动，并导航到您想要的用户

从后台删除应用程序时，UNUserNotificationCenterDelegate无法正常工作

2 个答案: