Question

我可以通过此方法获取推送通知消息：

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject], fetchCompletionHandler completionHandler: (UIBackgroundFetchResult) -> Void) {
}

但问题是如何在应用程序运行时显示警报通知，就像应用程序处于后台时显示的那样。

这可能吗？

Answer 1

当应用程序处于前台时，您只能获得回调，iOS在这种情况下不显示警报，您必须自己执行...

你可以这样做：

为“PN前景视图”创建一个笔尖，例如：

当您在前台获得PN时，您可以实例化视图，并使用动画将代码添加到UIWindow，例如：

        // init and configure your custom PN foreground view
        let nib = UINib(nibName: self.nibName, bundle: NSBundle(forClass: PnForegroundView))
        pnForegroundView = nib.instantiateWithOwner(nil, options: nil)[0] as! PnForegroundView
        pnForegroundView.setWidth(UIScreen.width)
        pnForegroundView.setHeight(63)
        pnForegroundView.title = <some title from notification>
        pnForegroundView.image = <some image from notification>

        // add the view to the key window 
        let window = UIApplication.sharedApplication().keyWindow!
        window.addSubview(pnForegroundView!)

        // Change window level to hide the status bar
        window.windowLevel = UIWindowLevelStatusBar

        // Show the PN foreground view with animation:

        self.pnForegroundView!.setBottom(0)
        self.changeWindowLevelToHideStatusBar()
        UIView.animateWithDuration(0.2) {
            self.pnForegroundView!.setBottom(self.pnForegroundView!.height)
        }

当然，您应该为此视图设置一个委托，以便用户单击该通知，以及当用户解除该通知时。

此外，您可以添加自动解雇的时间。

最后一件事 - 删除PnForegroundView后，您最好将UIWindow级别重置为默认值，以显示状态栏

Answer 2

将这个completionHandler行添加到appDelegate方法对我有用：

//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) {
print("User Info = ",notification.request.content.userInfo)

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

Answer 3

didReceiveRemoteNotification将触发，无论您是前景还是后台，但是，您可以单独处理它们，如下所示

func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
        let state = UIApplication.sharedApplication().applicationState
        if state == UIApplicationState.Active {
            //show alert here your app is in foreground
        }
        else{
            //your app is in background
        }

    }

当应用程序处于前台时显示通知警报

3 个答案: