【问题标题】：how to get push notification when app is open?应用程序打开时如何获得推送通知？
【发布时间】：2019-06-11 10:58:23
【问题描述】：
我正在开发 swift 4.2。当应用程序处于后台时我会收到通知，但当应用程序处于活动状态时我没有收到通知。
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
completionHandler([.alert, .badge, .sound])
}
我想知道如何在应用打开时收到通知
【问题讨论】：
标签：
ios
swift
push-notification
unusernotificationcenter
【解决方案1】：
您需要在您的 AppDelegate 类中确认 UNUserNotificationCenterDelegate；
import UserNotifications
class AppDelegate : UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
UNUserNotificationCenter.current().delegate = self
}
然后你可以在你的ViewController类中调用这个函数，不要忘记在ViewController中再次导入UserNotifications；
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)
{
completionHandler([.alert, .badge, .sound])
}
【解决方案2】：
使用上述代码更新此代码
func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler:
@escaping (UNNotificationPresentationOptions) -> Void) {
print("Handle push from foreground")
print("\(notification.request.content.userInfo)")
completionHandler([.alert, .badge, .sound])
return
}