Question

我想检查应用是否在后台运行。

在：

locationManagerDidUpdateLocation {
    if(app is runing in background){
        do this
    }
}

Answer 1

App委托获取指示状态转换的回调。您可以根据它进行跟踪。

UIApplication中的applicationState属性也返回当前状态。

[[UIApplication sharedApplication] applicationState]

Answer 2

UIApplicationState state = [[UIApplication sharedApplication] applicationState];
if (state == UIApplicationStateBackground || state == UIApplicationStateInactive)
{
   //Do checking here.
}

这可以帮助您解决问题。

请参阅下面的评论 - 非活动是一个相当特殊的情况，可能意味着该应用程序正处于启动进入前台的过程中。根据你的目标，这可能意味着或不意味着“背景”......

Answer 3

Swift 3

    let state = UIApplication.shared.applicationState
    if state == .background {
        print("App in Background")
    }

Answer 4

Swift版本：

   let state = UIApplication.sharedApplication().applicationState
            if state == .Background {
                print("App in Background")
             }

Answer 5

如果您希望接收回调而不是＆＃34;请问＆＃34;关于应用程序状态，请在AppDelegate：

中使用这两种方法

- (void)applicationDidBecomeActive:(UIApplication *)application {
    NSLog(@"app is actvie now");
}


- (void)applicationWillResignActive:(UIApplication *)application {
    NSLog(@"app is not actvie now");
}

Answer 6

swift 4

let state = UIApplication.shared.applicationState
    if state == .background {
        print("App in Background")
        //MARK: - if you want to perform come action when app in background this will execute 
        //Handel you code here
    }
    else if state == .foreground{
        //MARK: - if you want to perform come action when app in foreground this will execute 
        //Handel you code here
    }

Answer 7

快速4 +

let appstate = UIApplication.shared.applicationState
        switch appstate {
        case .active:
            print("the app is in active state")
        case .background:
            print("the app is in background state")
        case .inactive:
            print("the app is in inactive state")
        default:
            print("the default state")
            break
        }

Answer 8

Swift 4.0扩展使其访问起来更简单：

import UIKit

extension UIApplication {
    var isBackground: Bool {
        return UIApplication.shared.applicationState == .background
    }
}

要从您的应用内访问：

let myAppIsInBackground = UIApplication.isBackground

如果要查找有关各种状态（active，inactive和background）的信息，则可以找到Apple documentation here。

有没有办法检查iOS应用程序是否在后台？

8 个答案: