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
在你的应用委托中使用下面的代码
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])
}
}
其他回答
在你的应用委托中使用下面的代码
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])
}
}
Xcode 10 Swift 4.2
当你的应用程序在前台时，显示推送通知
步骤1:在AppDelegate类中添加delegate UNUserNotificationCenterDelegate。
class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate {
步骤2:设置UNUserNotificationCenter委托
let notificationCenter = UNUserNotificationCenter.current()
notificationCenter.delegate = self
第三步:这一步将允许你的应用程序显示推送通知，即使你的应用程序在前台
func userNotificationCenter(_ center: UNUserNotificationCenter,
willPresent notification: UNNotification,
withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .sound])
}
步骤4:该步骤是可选的。检查你的应用程序是否在前台，如果在前台，然后显示本地推送通知。
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)
}
正如@Danial Martine所说，iOS不会显示通知横幅/提醒。这是故意的。但如果真要这么做，还有一个办法。我也用同样的方法做到了这一点。
1.从parse FrameWork下载解析框架
2.导入# Import <Parse/Parse.h> .h
3.将以下代码添加到您的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在前台，这显示警报，否则它显示在顶部的通知。
Swift 5
1)使用UNUserNotificationCenterDelegate确认委托到AppDelegate 2)在didFinishLaunch中UNUserNotificationCenter.current().delegate = self 3)在AppDelegate中实现如下方法。
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!
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)
与
completionHandler([.alert, .badge, .sound]))
