OC
1. 类(Class)
@interface MyClass : NSObject @property (nonatomic, strong) NSString *name; - (void)printName; @end
2. 类对象(Class Object)
3. 类与类对象的关系
4. 类方法与实例方法的区别
5. 类对象的实现
6. 元类(Meta-class)
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