Article 1. This article is good
[IPhone advanced] XMPP-based IOS chat client (XMPP Server Architecture)
Http://blog.csdn.net/kangx6/article/details/7739828
[IPhone advanced] XMPP-based IOS chat client (IOS client 1)
Http://blog.csdn.net/kangx6/article/details/7740135
[IPhone advanced] XMPP-based IOS chat client (IOS client 2)
Http://blog.csdn.net/kangx6/article/details/7744304
[IPhone advanced] XMPP-based IOS chat client (IOS client 3)
Http://blog.csdn.net/kangx6/article/details/7750765
Article 2.
XMPP-based IM research on iPhone Platform
Http://blog.csdn.net/liuhongwei123888/article/details/6840262
Article 3.
[Ios xmpp] Use xmppframewok (1): Add xmppframework (xcode 4.6.2) http://www.cnblogs.com/dyingbleed/archive/2013/05/09/3069145.html
[Ios xmpp] Using xmppframewok (2): User Login http://www.cnblogs.com/dyingbleed/archive/2013/05/10/3069397.html
[Ios xmpp] Using xmppframewok (3): friend status http://www.cnblogs.com/dyingbleed/archive/2013/05/13/3071544.html
[Ios xmpp] Use xmppframewok (4): send and receive message http://www.cnblogs.com/dyingbleed/archive/2013/05/16/3075105.html
[Ios xmpp] Using xmppframewok (5): friend list http://www.cnblogs.com/dyingbleed/archive/2013/05/17/3082226.html
Learn XMPP, better reference article address, keep yourself easy to find