特殊需求，需要在APP内点击一个按钮，杀死APP。求实现方法，并且请问，这种功能，会被会有被Apple store拒绝的危险
一般不会拒绝，我确实看到有这么干的。
只要一行就行,并且，这不是crash,不会有crash log：
exit(0);可能会被拒绝的，毕竟exit函数是不推荐使用的，这得看心情了。如果你的这个应用不那么好测试的话，那有可能不被拒绝。
参见： https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/MobileHIG/StartingStopping.html
如果是发布到 App Store 上的 app ，建议不要这么做，文档上清楚地写明了，如果被审核人员发现的话，基本就是被拒了：
Always Be Prepared to Stop
An iOS app never displays a Close or Quit option. People stop using an app when they switch to another app, return to the Home screen, or put their devices in sleep mode.
Never quit an iOS app programmatically. People tend to interpret this as a crash. If something prevents your app from functioning as intended, you need to tell users about the situation and explain what they can do about it.