是否有NSNotification的电话呼叫状态 [英] Is there an NSNotification for phone call status

问题描述

当设备打开/关闭手机时，我们可以观察到NSNotification吗？

Is there an NSNotification we can observe for when the device is on/off the phone?

推荐答案

NotificationCenter 不会发出任何通知，但是看看iOS 4中引入的 CTCallCenter 类。它有一个 callEventHandler 属性，你可以分配一个块代码，并通过调用状态信息调用。

The NotificationCenter doesn't send out any notifications abou this, but take a look at the CTCallCenter class introduced in iOS 4. It has a callEventHandler property that you can assign a block of code to, and gets called with call state info.

有一个限制，只有当你的应用程序在前台（或被取出）时才会调用处理程序来电时的前景），但它会告诉您用户是否正在拨号（ CTCallStateDialing ），接听电话（ CTCallStateIncoming ），回答/连接（ CTCallStateConnecting ）或挂断电话（ CTCallStateDisconnected ）。

There is a limitation in that the handler only gets called when your app is in the foreground (or being taken out of the foreground when a call comes in), but it tells you if the user is dialing (CTCallStateDialing), receiving a call (CTCallStateIncoming), answering/connecting (CTCallStateConnecting) or hanging up on a call (CTCallStateDisconnected).

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