我在我的应用程序中使用推送通知服务。当应用程序在后台运行时，我可以在通知屏幕上看到通知（通过从iOS设备顶部向下滑动显示的屏幕）。但如果应用程序在前台运行，则委托方法
- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
正在调用，但通知没有显示在通知屏幕上。
我希望在通知屏幕上显示通知，无论应用程序是在后台还是前台运行。我已经搜索了很久，寻找解决办法。非常感谢任何帮助。
在应用程序前台显示横幅消息，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
...
}
UNUserNotificationsCenter.current().delegate = self。 - Achintya Ashok以下代码将适用于您：
- (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];
}
}
title是稍微大一点的粗体文本，而message是在其下方的较小文本。底部有一个“确定”按钮以关闭）。 将选项applicationIconBadgeNumber设置为0是为了隐藏Springboard上应用程序图标顶部显示的数字（例如，在邮件应用中表示未读消息数量）。在这个例子中，我不知道是否需要该选项。 - jwinnObjective C
为了在前台显示通知横幅，对于iOS 10，我们需要集成willPresentNotification方法。
如果应用程序处于前台模式（活动状态）
- (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);
}
如果有人感兴趣的话，我最终创建了一个自定义视图，看起来像系统上方的推送横幅，但增加了一个关闭按钮（小蓝色X）和一个选项，可以点击消息执行自定义操作。它还支持用户在有多个通知到达之前没有时间阅读/解除旧通知的情况（没有限制可以积累多少...）
基本上是一行代码就能使用：
[AGPushNoteView showWithNotificationMessage:@"John Doe sent you a message!"];
在iOS7上看起来是这样的（iOS6有iOS6的外观和感觉...）
如果应用程序正在前台运行，iOS 不会显示通知横幅/提示。这是设计上的限制。但我们可以通过以下方式使用 UILocalNotification 来实现：
在接收到远程通知时，检查应用程序是否处于活动状态。如果处于活动状态，则触发一个 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)
}
application:didReceiveLocalNotification:方法来处理通知。使用提供的UILocalNotification对象中的信息来决定采取什么操作。当应用程序已经在前台时，系统不会显示任何警报、徽章或播放任何声音。 - Chris Morse针对 Swift 5：
1）确认AppDelegate的委托使用
UNUserNotificationCenterDelegate2）在
didFinishLaunch中使用UNUserNotificationCenter.current().delegate = self3）实现下面的方法在
AppDelegate中。
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
print("Push notification received in foreground.")
completionHandler([.alert, .sound, .badge])
}
就是这样了！
Xcode 10 Swift 4.2
当您的应用程序在前台时显示推送通知 -
步骤1：在AppDelegate类中添加代理UNUserNotificationCenterDelegate。
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
第二步：设置UNUserNotificationCenter委托
let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.delegate = self
步骤3： 此步骤将允许您的应用程序在前台显示推送通知。
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .sound])
}
步骤 4：此步骤为可选。检查您的应用程序是否在前台，如果是，则显示本地推送通知。
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)
}
UITabBar 图标中，模拟通知中心横幅等）。UNUserNotificationCenter API）。随着这个新API的出现，现在可以在应用程序前台显示通知。因此，如果您因此问题中的不同答案而感到困惑，那是因为其中一些答案太旧了，只描述了iOS 9及之前的行为，而其他答案则没有考虑到UNUserNotificationCenter 仅适用于iOS 10及以上版本。 - tomaccoTWMessageBarManager 可以通过应用程序委托本身轻松调用和使用，因为它使用单例设计模式。感谢提供的链接。 - Jay Mayu@available(iOS 10.0, *)
func userNotificationCenter(center: UNUserNotificationCenter, willPresentNotification notification: UNNotification, withCompletionHandler completionHandler: (UNNotificationPresentationOptions) -> Void)
{
completionHandler([UNNotificationPresentationOptions.Alert,UNNotificationPresentationOptions.Sound,UNNotificationPresentationOptions.Badge])
}
notification.request.content.userInfo。