Add property

动态的添加属性

#import "NSObject+Objc.h"
#import <objc/runtime.h>

@implementation NSObject (Objc)

-(void)setName:(NSString *)name
{
    /* objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)
     * object :给哪个类添加属性
     * key:属性名，根据key，来进行关联,eg:addName来关联name
     * objc_AssociationPolicy: 关联策略，就是那种存储类型 NSString用copy撒
     */

    objc_setAssociatedObject(self, @"addName", name, OBJC_ASSOCIATION_COPY_NONATOMIC);

}
-(NSString *)name{

    return objc_getAssociatedObject(self, @"addName");
}
@end