各种网站。

iOS高效开发必备的10款Objective-C类库：

http://mobile.51cto.com/hot-249831.htm

学习。

http://blog.colcy.com/page/3/

http://unmi.cc/

http://blog.sina.com.cn/s/blog_839676880100xmop.html

http://www.siverchen.com/category/mobile/ios

UIKit介绍

http://never2012.blog.163.com/blog/static/2008810722011111334050135/

corePlot

http://www.cnblogs.com/simalone/archive/2010/11/01/1866076.html

http://www.cnblogs.com/encounter/archive/2011/03/01/2188513.html

http://www.cocoachina.com/bbs/read.php?tid=15676&page=1&toread=1#185891

xmpp

http://mobile.tutsplus.com/tutorials/iphone/building-a-jabber-client-for-ios-server-setup/

UIWebView 介绍

http://wangjun.easymorse.com/?p=1080

http://www.cocoachina.com/bbs/read.php?tid=3873&keyword=webview

TCP/IP SOCKET HTTP

http://blog.sina.com.cn/s/blog_4b3c1f950100g8kt.html

http://www.cnblogs.com/imlucky/archive/2011/10/18/2216829.html

UIDocumentInteractionController

http://mobiforge.com/developing/story/importing-exporting-documents-ios

录音

http://www.cnblogs.com/visen-0/archive/2011/12/28/2304811.html

开源资料

http://blog.csdn.net/diyagoanyhacker/article/details/7173258

UDID解决办法

http://www.cnblogs.com/zhulin/archive/2012/03/26/2417860.html

开源资料

http://blog.csdn.net/diyagoanyhacker/article/details/7173258