ios 动态创建类

//动态创建类

        //1.使用objc_allocateClassPair创建一个类Class
        const char *className = "Person";
        Class class = objc_getClass(className);
        if(!class){
            Class superClass = [NSObject class];
            class = objc_allocateClassPair(superClass, className, 0);
        }
        
        //2.现在可以使用自定义的Person类
        id instance = [[class alloc] init];
        
        //3.给instance类添加一个属性name，并且赋值
        objc_setAssociatedObject(instance, "name", @"Victor John", OBJC_ASSOCIATION_COPY_NONATOMIC);
        
        //给description属性设置
        objc_setAssociatedObject(instance, "description", @"Person类的description", OBJC_ASSOCIATION_COPY_NONATOMIC);
        
        //4.然后获取值
        id name = objc_getAssociatedObject(instance, "name");
        id description = objc_getAssociatedObject(instance, "description");
        
        //5.输出打印
        NSLog(@"Person=%p, name=%@ ,description=%@", class, name, description);