在swift中检测应用程序是在后台还是前台 [英] Detect if the application in background or foreground in swift

问题描述

有没有办法知道我的应用程序的状态，如果它处于后台模式或前台。谢谢

is there any way to know the state of my application if it is in background mode or in foreground . Thanks

推荐答案

[UIApplication sharedApplication] .applicationState 将返回当前状态应用程序，

[UIApplication sharedApplication].applicationState will return current state of applications,

• UIApplicationStateActive


• UIApplicationStateInactive


• UIApplicationStateBackground

我们需要打电话

let state: UIApplicationState = UIApplication.sharedApplication().applicationState // or use  let state =  UIApplication.sharedApplication().applicationState

if state == .Background {

// background
}
else if state == .Active {

// foreground
}

swift 3及以上

let state = UIApplication.shared.applicationState

    if state == .background {

        // background
    }
    else if state == .active {

        // foreground
    }

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