摘要：
官方网站的例子，摘自别人的博客。谢谢原博客的分享。http://blog.csdn.net/cocoa_geforce/article/details/6717377http://developer.apple.com/iphone/library/samplecode/Reachability/Reachability.ziphttp://developer.apple.com/iphone/library/samplecode/avTouch/avTouch.ziphttp://developer.apple.com/iphone/library/samplecode/AdvancedUR 阅读全文