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我想编写一个应用程序监视器，无论是短信（或 iMessage）、电子邮件还是来电？我知道公共框架（CoreTelephony）监控一个呼叫，但它在后台很长一段时间都不能工作。那么如何监控短信和电子邮件呢？谢谢！