我在我的应用程序中使用推送通知服务。当应用程序在后台时,我能够在通知屏幕上看到通知(当我们从iOS设备顶部向下滑动时显示的屏幕)。但如果应用程序是在前台的委托方法

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo

正在被调用,但通知屏幕上没有显示通知。

我想在通知屏幕上显示通知,不管应用程序是在后台还是前台。我厌倦了寻找解决办法。任何帮助都非常感激。


当前回答

也适用于iOS 14+,不需要手动处理任何警报或视图,只需让iOS做它的事情

在里面,我们重新收到通知替换如下代码

func userNotificationCenter(
    _ center: UNUserNotificationCenter,
    willPresent notification: UNNotification,
    withCompletionHandler completionHandler:
    @escaping (UNNotificationPresentationOptions) -> Void
  ) {
    
    if (UIApplication.shared.applicationState == .inactive || UIApplication.shared.applicationState == .background) {
      if #available(iOS 14.0, *) {
        completionHandler([[.banner, .sound]])
      } else {
        completionHandler([.alert, .sound])
      }
    } else {
      if #available(iOS 14.0, *) {
        completionHandler([[.banner]])
      } else {
        completionHandler([.alert])
      }
    }
  }

要注意的主要事情是不要使用声音,而在前景,它不会显示横幅

其他回答

当应用程序在前台显示横幅消息时,使用以下方法。

iOS 10, Swift 3/4:

// This method will be called when app received push notifications in foreground
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) 
{
    completionHandler([.alert, .badge, .sound])
}

iOS 10, Swift 2.3:

@available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, willPresentNotification notification: UNNotification, withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)
{
    //Handle the notification
    completionHandler(
       [UNNotificationPresentationOptions.Alert,
        UNNotificationPresentationOptions.Sound,
        UNNotificationPresentationOptions.Badge])
}

你还必须将你的应用委托注册为通知中心的委托:

import UserNotifications

// snip!

class AppDelegate : UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate

// snip!

   func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

      // set the delegate in didFinishLaunchingWithOptions
      UNUserNotificationCenter.current().delegate = self
      ...
   }

用于swift 5解析推送通知字典

    func application(_ application: UIApplication, didReceiveRemoteNotification data: [AnyHashable : Any]) {
            if application.applicationState == .active {
                if let aps1 = data["aps"] as? NSDictionary {
                    if let dict = aps1["alert"] as? NSDictionary {
                        if let strTitle = dict["title"] as? String , let strBody = dict["body"] as? String {
                            if let topVC = UIApplication.getTopViewController() {
                                //Apply your own logic as per requirement
                                print("strTitle ::\(strTitle) , strBody :: \(strBody)")
                            }
                        }
                    }
                }
            }
        }

获取topBanner所在的top viewController

extension UIApplication {

    class func getTopViewController(base: UIViewController? = UIApplication.shared.keyWindow?.rootViewController) -> UIViewController? {

        if let nav = base as? UINavigationController {
            return getTopViewController(base: nav.visibleViewController)

        } else if let tab = base as? UITabBarController, let selected = tab.selectedViewController {
            return getTopViewController(base: selected)

        } else if let presented = base?.presentedViewController {
            return getTopViewController(base: presented)
        }
        return base
    }
}

如果你的应用程序处于前台状态,这意味着你正在使用同一个应用程序。所以通常没有必要在顶部显示通知。

但如果你想显示通知在那种情况下你必须创建你的自定义警报视图或自定义视图像Toast或其他东西来向用户显示你已经收到通知。

如果你的应用中有这样的功能,你也可以在顶部显示一个徽章。

100%工作测试

第一次进口

import UserNotifications

然后在类中添加委托

UNUserNotificationCenterDelegate


class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate

下面的方法是负责,而应用程序是打开和通知来。

将呈现

   @available(iOS 10.0, *)
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
            let content = notification.request.content

           let alertVC = UIAlertController.init(title: title, message: body, preferredStyle: .alert)

            alertVC.addAction(UIAlertAction.init(title: appLan_share.Ok_txt, style: .default, handler: {
                _ in
                   //handle tap here or navigate somewhere…..                
            }))

            vc?.present(alertVC, animated: true, completion: nil)

            print("notification Data: \(content.userInfo.values)")
                completionHandler([.alert, .sound])



}

您还可以通过检查当前应用程序状态来处理应用程序状态。

此外,如果你的应用程序没有运行,那么下面的方法是负责处理推送通知

didReceive

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
        let userInfo = response.notification.request.content.userInfo
        let aps = userInfo["aps"] as? [String: Any]
        let alert = aps?["alert"] as? [String: String]

}

最好的方法是通过使用扩展AppDelegate: UNUserNotificationCenterDelegate在AppDelegate中添加UNUserNotificationCenterDelegate 该扩展告诉应用程序能够在使用时获得通知

并实现这个方法

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

只有当应用程序在前台时,才会在委托上调用此方法。

最后的实现:

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

要调用这个,你必须在AppDelegate中在didFinishLaunchingWithOptions中设置委托添加这一行

UNUserNotificationCenter.current().delegate = self

你可以修改

completionHandler(.alert) 

completionHandler([.alert, .badge, .sound]))