Question

我在我的应用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设备的顶部向下滑动时显示的屏幕）。但是如果应用程序在前台是委托方法

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

被调用但通知屏幕中不显示通知。

我想在通知屏幕上显示通知，无论应用是在后台还是前台。我厌倦了寻找解决方案。非常感谢任何帮助。

Answer 1

要在应用程序位于前台时显示横幅消息，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])
}

您还必须注册您的应用代表作为通知中心的代表：

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
      ...
   }

Answer 2

以下代码适用于您：

- (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];          
    }    
}

Answer 3

对于任何可能感兴趣的人，我最终创建了一个自定义视图，它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）和一个用于点击消息以进行自定义操作的选项。它还支持在用户有时间读取/解除旧通知之前到达多个通知的情况（没有限制可以堆积多少...）

Link to GitHub: AGPushNote

用法基本上是在线：

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

在iOS7上看起来像这样（iOS6具有iOS6的外观和感觉......）

enter image description here

Answer 4

目标C

对于iOS 10，我们需要在willPresentNotification中为展示通知横幅整合foreground方法。

如果app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);
}

Answer 5

如果应用程序在前台运行，iOS将不会显示通知横幅/警报。这是设计的。但是我们可以使用UILocalNotification来实现它，如下所示

检查应用程序在接收远程时是否处于活动状态通知。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];
}

SWIFT：

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

Answer 6

如果应用程序在前台运行，iOS将不会显示通知横幅/警报。这是设计的。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。您应该以最合适的方式显示通知（例如，将徽章编号添加到UITabBar图标，模拟通知中心横幅等）。

Answer 7

您可以创建自己的模仿横幅提醒的通知。

一种方法是创建一个看起来像横幅的自定义uiview，可以设置动画并响应触摸。考虑到这一点，您可以使用更多功能创建更好的横幅。

或者你可以找一个为你做的api，并将它们作为podfiles添加到你的项目中。

以下是我使用的一对夫妇：

https://github.com/terryworona/TWMessageBarManager

https://github.com/toursprung/TSMessages

Answer 8

以下是app处于活动状态（前台或打开）时接收推送通知的代码。 UNUserNotificationCenter documentation

@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userInfo的通知使用代码：notification.request.content.userInfo

Answer 9

根据apple documentation，是的，您可以在应用运行时显示通知

Answer 10

对于Swift 5

1）使用UNUserNotificationCenterDelegate
确认AppDelegate的委托。
2）UNUserNotificationCenter.current().delegate = self中的didFinishLaunch

3）在AppDelegate中实现以下方法。

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

就是这样！

Answer 11

Xcode 10 Swift 4.2

当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 {

第2步：：设置UNUserNotificationCenter委托

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

第3步：：即使您的应用位于前台，该步骤也将允许您的应用显示“推送通知”

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

    }

第4步：：此步骤为可选。检查您的应用程序是否在前台，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)
    }

Answer 12

将该completionHandler行添加到委托方法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])
}

Answer 13

在你的app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])
    }
}

Answer 14

用于快速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
    }
}

Answer 15

为此的最佳方法是使用UNUserNotificationCenterDelegate在AppDelegate中添加extension AppDelegate: UNUserNotificationCenterDelegate 该扩展程序告诉应用程序在使用中能够获得通知

并实现此方法

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

仅当应用程序在前景中时，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)
    }
}

要调用此方法，必须在didFinishLaunchingWithOptions的AppDelegate中设置委托，然后添加此行

UNUserNotificationCenter.current().delegate = self

您可以修改

completionHandler(.alert)

与

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

Answer 16

如上所述，您应该使用UserNotification.framework来实现此目的。但是出于我的目的，我必须在应用程序中显示它并且想要iOS 11样式，所以我创建了一个小帮助视图，可能对某人有用。

GitHub iOS 11 Push Notification View

Answer 17

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

但是，如果你想在这种情况下显示通知，你必须创建自定义警报视图或自定义视图，如Toast或其他东西，以向用户显示您已收到通知。

如果您的应用中有此类功能，您还可以在顶部显示徽章。

Answer 18

正如@Danial Martine所说，iOS不会显示通知横幅/警告。这是设计的。但如果真的必须这样做，那么有一种方法。我也是这样做的。

1.从Parse FrameWork

下载解析框工作

2.Import #import <Parse/Parse.h>

3.将以下代码添加到didReceiveRemoteNotification方法

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

PFPush会注意如何处理远程通知。如果App位于前台，则会显示警告，否则会在顶部显示通知。

在前台iOS中的App时获取推送通知

18 个答案:

Link to GitHub: AGPushNote