摘要：Things won't make sense the first time you see them, and that's perfectly normal. Keep practicing and you'll get there. 1. OP: 基于过程，系统由一个个逻辑过程组成，每个过程密不可分 + 数学应用题的解答方式 + 面向对象思路对解决数学问题有没有启发OO：系统由一系列对象... 阅读全文

摘要：语言的构架和设计一定有其逻辑，不可能杂乱无章或随心所欲！ 1. 类属性修饰符：assign, retain, copy, nonatomic, strong, weak 1.1. assign: In your setter method for the property, there is a simple assignment of your instance variable to the... 阅读全文