在前台iOS中获取App时的推送通知

我在我的应用程序中使用了推送通知服务。当应用程序在后台运行时，我可以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）。但是如果应用程序位于前台，则委托方法

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

正在被呼叫，但通知未显示在通知屏幕中。

我想在通知屏幕上显示通知，而不管应用程序是在后台还是在前台。寻找解决方案让我很累。任何帮助是极大的赞赏。

要在应用程序处于前台状态时显示横幅消息，请使用以下方法。

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])
}

您还必须将应用程序代理注册为通知中心的代理：

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
      ...
   }

下面的代码将为您工作：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo  {
    application.applicationIconBadgeNumber = 0;             
    //self.textView.text = [userInfo description];
    // We can determine whether an application is launched as a result of the user tapping the action
    // button or whether the notification was delivered to the already-running application by examining
    // the application state.

    if (application.applicationState == UIApplicationStateActive) {                
        // Nothing to do if applicationState is Inactive, the iOS already displayed an alert view.                
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Did receive a Remote Notification" message:[NSString stringWithFormat:@"Your App name received this notification while it was running:\n%@",[[userInfo objectForKey:@"aps"] objectForKey:@"alert"]]delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
        [alertView show];          
    }    
}

对于可能感兴趣的任何人，我最终创建了一个自定义视图，该视图看起来像顶部的系统推送横幅，但添加了一个关闭按钮（小蓝色X）和一个点击消息以执行自定义操作的选项。它还支持在用户有时间读取/关闭旧通知之前到达多个通知的情况（不限制可以堆积多少个…）

链接到GitHub：AGPushNote

用法基本上是在线的：

[AGPushNoteView showWithNotificationMessage:@"John Doe sent you a message!"];

在iOS7上看起来像这样（iOS6具有iOS6外观...）

目标C

因为iOS 10我们需要集成willPresentNotification方法来显示中的通知通知横幅foreground。

如果应用程序处于前台模式（活动）

- (void)userNotificationCenter:(UNUserNotificationCenter* )center willPresentNotification:(UNNotification* )notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions options))completionHandler {
    NSLog( @“Here handle push notification in foreground" ); 
    //For notification Banner - when app in foreground

    completionHandler(UNNotificationPresentationOptionAlert);

    // Print Notification info
    NSLog(@"Userinfo %@",notification.request.content.userInfo);
}

如果应用程序在前台运行，iOS将不会显示通知横幅/警报。那是设计使然。但是我们可以通过UILocalNotification以下方式实现

• 收到远程
  通知后，检查应用程序是否处于活动状态。如果处于活动状态，则触发UILocalNotification。

  if (application.applicationState == UIApplicationStateActive ) {
  
      UILocalNotification *localNotification = [[UILocalNotification alloc] init];
      localNotification.userInfo = userInfo;
      localNotification.soundName = UILocalNotificationDefaultSoundName;
      localNotification.alertBody = message;
      localNotification.fireDate = [NSDate date];
      [[UIApplication sharedApplication] scheduleLocalNotification:localNotification];
  }

迅速：

if application.applicationState == .active {
    var localNotification = UILocalNotification()
    localNotification.userInfo = userInfo
    localNotification.soundName = UILocalNotificationDefaultSoundName
    localNotification.alertBody = message
    localNotification.fireDate = Date()
    UIApplication.shared.scheduleLocalNotification(localNotification)
}

如果应用程序在前台运行，iOS将不会显示通知横幅/警报。那是设计使然。您必须编写一些代码来处理应用程序在前台接收通知时的情况。您应该以最适当的方式显示通知（例如，将徽章编号添加到UITabBar图标，模拟通知中心横幅等）。

Xcode 10 Swift 4.2

要在您的应用程序位于前台时显示推送通知-

步骤1：在AppDelegate类中添加委托UNUserNotificationCenterDelegate。

class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {

步骤2：设置UNUserNotificationCenter委托

let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.delegate = self

步骤3：即使您的应用程序位于前台，此步骤也将允许您的应用程序显示“推送通知”

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

    }

步骤4：此步骤是可选的。检查您的应用程序是否在前台，以及是否在前台，然后显示Local PushNotification。

func application(_ application: UIApplication,didReceiveRemoteNotification userInfo: [AnyHashable: Any],fetchCompletionHandler completionHandler:@escaping (UIBackgroundFetchResult) -> Void) {

        let state : UIApplicationState = application.applicationState
        if (state == .inactive || state == .background) {
            // go to screen relevant to Notification content
            print("background")
        } else {
            // App is in UIApplicationStateActive (running in foreground)
            print("foreground")
            showLocalNotification()
        }
    }

本地通知功能-

fileprivate func showLocalNotification() {

        //creating the notification content
        let content = UNMutableNotificationContent()

        //adding title, subtitle, body and badge
        content.title = "App Update"
        //content.subtitle = "local notification"
        content.body = "New version of app update is available."
        //content.badge = 1
        content.sound = UNNotificationSound.default()

        //getting the notification trigger
        //it will be called after 5 seconds
        let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false)

        //getting the notification request
        let request = UNNotificationRequest(identifier: "SimplifiedIOSNotification", content: content, trigger: trigger)

        //adding the notification to notification center
        notificationCenter.add(request, withCompletionHandler: nil)
    }

根据apple 文档，是的，您可以在应用运行时显示通知

您可以创建自己的模仿横幅警报的通知。

一种方法是创建一个自定义uiview，该uiview看起来像横幅，可以设置动画并响应触摸。考虑到这一点，您可以创建具有更多功能的更好的横幅。

或者，您可以寻找一个为您执行此操作的api，然后将它们作为podfile添加到您的项目中。

这是我使用过的几个：

https://github.com/terryworona/TWMessageBarManager

https://github.com/toursprung/TSMessages

这是在应用程序处于活动状态（前台或打开）时接收推送通知的代码。 UNUserNotificationCenter文档

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

如果您需要访问通知的userInfo，请使用代码： notification.request.content.userInfo

在我的委托方法中添加了completionHandler行，为我解决了同样的问题：

//Called when a notification is delivered to a foreground app.
@available(iOS 10.0, *)
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

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

对于Swift 5解析PushNotification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)")
                            }
                        }
                    }
                }
            }
        }

要获取我们在其上显示topBanner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
    }
}

在您的应用程序委托中使用以下代码

import UIKit
import UserNotifications
@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
 var currentToken: String?
 var window: UIWindow?
 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
        // Override point for customization after application launch.
        application.registerForRemoteNotifications()
        let center = UNUserNotificationCenter.current()
        center.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in

            // Enable or disable features based on authorization.
            if granted == true
            {
                print("Allow")
                UIApplication.shared.registerForRemoteNotifications()
            }
            else
            {
                print("Don't Allow")
            }
        }
        UNUserNotificationCenter.current().delegate = self

        return true
    }
func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data){
        let tokenParts = deviceToken.map { data -> String in
            return String(format: "%02.2hhx", data)
        }
        let token = tokenParts.joined()
        currentToken = token  //get device token to delegate variable

    }
 public class var shared: AppDelegate {
        return UIApplication.shared.delegate as! AppDelegate
    }
 func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
         completionHandler([.alert, .badge, .sound])
    }
}

如上所述，您应该使用它UserNotification.framework来实现这一目标。但是出于我的目的，无论如何我都必须在应用程序中显示它并希望拥有iOS 11样式，因此我创建了一个小助手视图，也许对某人有用。

GitHub iOS 11推送通知视图。

这个最好的办法是增加UNUserNotificationCenterDelegate在AppDelegate使用extension AppDelegate: UNUserNotificationCenterDelegate 该扩展告诉应用程序能在使用时获得通知

并实现此方法

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

仅当应用程序位于Foreground中时，才会在委托上调用此方法。

所以最终实现：

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

要调用此方法，必须在AppDelegate中设置委托，并didFinishLaunchingWithOptions添加以下行

UNUserNotificationCenter.current().delegate = self

您可以修改

completionHandler(.alert) 

与

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

对于Swift 5

1）使用以下命令确认对AppDelegate的委托 UNUserNotificationCenterDelegate

2）UNUserNotificationCenter.current().delegate = self在didFinishLaunch

3）在中实施以下方法AppDelegate。

func userNotificationCenter(_ center: UNUserNotificationCenter,
                                willPresent notification: UNNotification,
                                withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
     print("Push notification received in foreground.")
     completionHandler([.alert, .sound, .badge])
}

而已！

正如@Danial Martine所说，iOS不会显示通知横幅/警报。那是设计使然。但是，如果真的必须这样做，那就只有一种方法。我也同样做到了这一点。

1.下载从解析帧工作解析FrameWork的

2.进口 #import <Parse/Parse.h>

3.将以下代码添加到didReceiveRemoteNotification方法中

 - (void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    [PFPush handlePush:userInfo];
}

PFPush将注意如何处理远程通知。如果App在前台，则显示警报，否则在顶部显示通知。

如果您的应用程序处于前台状态，则表示您当前正在使用同一应用程序。因此，通常无需在顶部显示通知。

但是，即使在这种情况下，如果您想显示通知，也必须创建自定义的“警报视图”或“自定义视图”（例如Toast）或其他向用户显示已收到通知的东西。

如果您的应用中具有这种功能，也可以在顶部显示徽章。