如何使用Swift编程退出app并返回iOS 8中的主屏幕 [英] How to exit app and return to home screen in iOS 8 using Swift programming

问题描述

我正在尝试使用Swift以编程方式返回iOS8 App中的主屏幕。我想继续在后台运行应用程序。关于如何做到这一点的任何想法？

I'm trying to programmatically return to the home screen in an iOS8 App using Swift. I want to continue the application running in the background though. Any ideas on how to do this?

提前感谢您的帮助。

推荐答案

启动应用程序时，系统调用UIApplicationMain函数;在其他任务中，此函数创建单个 UIApplication 对象。然后通过调用sharedApplication类方法访问该对象。

When an app is launched, the system calls the UIApplicationMain function; among its other tasks, this function creates a singleton UIApplication object. Thereafter you access the object by calling the sharedApplication class method.

要正常退出（iOS开发人员库明确警告您不要使用exit（0），因为它记录为崩溃）你可以使用：

To exit gracefully (the iOS developer library explicitly warns you not to use exit(0) because this is logged as a crash ) you can use:

UIControl().sendAction(#selector(URLSessionTask.suspend), to: UIApplication.shared, for: nil)

例如，当用户摇动设备时，我的应用会退出。所以，在ViewController.swift中：

For example, my app exits when the user shakes the device. So, in ViewController.swift:

override func motionEnded(motion: UIEventSubtype,
    withEvent event: UIEvent?) {

        if motion == .MotionShake{

            //Comment: to terminate app, do not use exit(0) bc that is logged as a crash.

            UIControl().sendAction(Selector("suspend"), to: UIApplication.sharedApplication(), forEvent: nil)
        }}

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