切换设置捆绑开关时显示警报
我想在切换 iPhone 应用程序设置包的开关时显示警报。谁能帮我看看该怎么做。
I want to show an alert when i toggle the switch of the iPhone application settings bundle. Can anyone please help me out how to do it.
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当 Settings.app 中的开关切换时，您的应用程序将处于后台。但是，如果您会阅读开发者文档，您会看到有一个可供您订阅的
NSUserDefaultsDidChangeNotification，并且当应用程序返回前台时显示警报。阅读文档并展示更多的研究成果确实有帮助，这是开发人员每天所做的事情。
When a switch in Settings.app is toggled, your app is in the background. However, if you would have read the Developer documentation you would have seen that there is a
NSUserDefaultsDidChangeNotificationavailable that you can subscribe to and show your alert when the app is back in the foreground.Reading the documentation and showing a little more research effort really helps, it's what developers do every day.