在 iOS 上收到通知时确定应用程序是否在前台运行

Question

I would like to find a way to see what app is running in foreground or if the home screen is displayed when a local notification from my app show up. For example i want to have different actions if there is in homescreen or in someone else app. I tried to use processed and pid but the pid is generated hen the app starts and not the last time the app is used. Any idea? thanks

Answer 1

如推送通知文档中所述，您可以在收到通知时阅读[[UIApplication sharedApplication] applicationState]以确定您的应用程序是在前台、非活动状态（它是可见的，但像 WiFi 选择器这样的对话框在前面）还是在后台。

Answer 2

Just to have a copy-paste code available for others:

if([[UIApplication sharedApplication] applicationState] == UIApplicationStateActive)
{
    //App is in foreground. Act on it.
}

Answer 3

Swift 5 version:

import UIKit
let isForeground = UIApplication.shared.applicationState == .active