http://www.jianshu.com/p/35df1ba1f107
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OBJC_EXPORT void objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)
__OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_1); -
OBJC_EXPORT id objc_getAssociatedObject(id object, const void *key)
__OSX_AVAILABLE_STARTING(__MAC_10_6, __IPHONE_3_1); -
简单的说：objc_setAssociatedObject是为对象动态添加属性和值，objc_getAssociatedObject是动态获得对象的属性值。
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objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)相当于动态添加属性
object.key = value -
objc_getAssociatedObject(id object, const void *key)相当于
值 = object.key
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