# 二、对象、消息、运行期

- [6、理解“属性”这一概念](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/6-li-jie-shu-xing-zhe-yi-gai-nian.md)
- [7、在对象内部尽量直接访问实例变量](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/7-zai-dui-xiang-nei-bu-jin-liang-zhi-jie-fang-wen-shi-li-bian-liang.md)
- [8、理解“对象等同性”这一概念](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/8-li-jie-dui-xiang-deng-tong-xing-zhe-yi-gai-nian.md)
- [9、以“类族模式”隐藏实现细节](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/9-yi-lei-zu-mo-shi-yin-cang-shi-xian-xi-jie.md)
- [10、在既有类中使用关联对象存放自定义数据](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/10-zai-ji-you-lei-zhong-shi-yong-guan-lian-dui-xiang-cun-fang-zi-ding-yi-shu-ju.md)
- [11、理解objc\_msgSend的作用](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/11-li-jie-objcmsgsend-de-zuo-yong.md)
- [12、理解消息转发机制](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/12-li-jie-xiao-xi-zhuan-fa-ji-zhi.md)
- [13、用“方法调配技术”调试“黑盒方法”](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/13-yong-fang-fa-tiao-pei-ji-shu-tiao-shi-hei-he-fang-fa.md)
- [14、理解“类对象”的用意](/objective-c2-0/er-dui-xiang-xiao-xi-yun-hang-qi/14-li-jie-lei-dui-xiang-de-yong-yi.md)