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熟悉系统框架
静态库：
静态库即静态链接库（Windows 下的 .lib，Linux 和 Mac 下的 .a）。之所以叫做静态，是因为静态库在编译的时候会被直接拷贝一份，复制到目标程序里，这段代码在目标程序里就不会再改变了。静态库的好处很明显，编译完成之后，库文件实际上就没有作用了。目标程序
...
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理解块(Block)的概念
默认情况 Block 捕获的变量是不可以在其内部修改的，如果加上 __block 关键字，这样就可以修改了。
self 也是个对象，Block 捕获的时候也会将其持有。如果 self 所指的那个对象同时也持有了 Block ,那么就会出现循环引用。
在 Block 直
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理解引用计数
属性存取中的内存管理(MRC)12345- (void)setFoo:(id)foo { [foo retain]; [_foo release]; _foo = foo; }
此方法先保留新值，并释放旧值，然后更新实例变量，另其指向新值。
引用计数
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使用分类打散代码
使用分类机制把类的实现代码划分成易于管理的小块。
将私有的方法归入叫 Private 的分类中，以便隐藏细节。
为第三方的分类加上前缀
分类中的方法会覆盖本类的同名方法，所以应该想第三分类添加分类时，总应该加上专用的前缀。
分类中不要声明属性
把封装数据的全部属性都
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避免命名空间冲突
Objective C 没有其他语言的命名空间机制，起名时需要加上前缀。
Apple 保留了两个字母的前缀，所以我们自己的项目应该是三个字母的前缀。
如果自己的项目引用了第三方库，则应该为其中的名称加上前缀。
尽量使用不可变对象
使用属性时，默认是 read-wirte
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OC中的属性
在对象之外访问实例变量，总是应该通过属性来做。在对象内部，除几种特殊情况，在读取实例变量的时候采用直接访问，设置的时候通过属性来做。
在初始化和 delloc 方法中，总是应该通过实例变量来读写数据。
懒加载初始化，需要通过属性来读取数据。
对象同等性