iphone 勿擾模式

http://ifans.pixnet.net/blog/post/47710386-ios-6-%E7%9A%84%E3%80%8C%E5%8B%BF%E6%93%BE%E6%A8%A1%E5%BC%8F%E3%80%8D%E6%98%AF%E4%BB%80%E9%BA%BC%E4%BD%9C%E7%94%A8%E5%91%A2%EF%BC%9F