简单的ios旅游软件app，用于简单的编程学习所使用。
Simple IOS Travel software app (2019-05-14, Objective-C, 57KB, 下载1次)
具体介绍NSObject类以及Objective-C程序是如何和运行时系统交互的。特别地，本文档还给出来怎样在运行时动态地加载新类和将消息转发给其它对象的范例，同时也给出了怎样在程序运行时获取对象信息的方法。
The NSObject class and how the Objective-C program interacts with the runtime system are introduced in detail. In particular, this document gives examples of how to dynamically load new classes and forward messages to other objects at runtime, and how to obtain object information at runtime. (2019-04-15, Objective-C, 358KB, 下载1次)
里面包含C语言相关的许多经典的编程案例，是初学者的宝典。
Which contains C language programming of many classic case is the book for beginners. (2009-06-18, Objective-C, 158KB, 下载1次)