Objective-C运行时版本是否会保留用户的关联引用？

当一些代码像这样：

objc_setAssociatedobject (
  obj,&key,val,OBJC_ASSOCIATION_RETAIN
);

我需要打电话给相关的

objc_setAssociatedobject (
  obj,nil,OBJC_ASSOCIATION_RETAIN
);

释放保留值？ Objective-C运行时是否自动释放dealloc或某处的关联引用？

解决方法

取消分配父对象时将释放关联对象.请参阅文档 here,特别是此示例：

At point 1,the string overview is still valid because the OBJC_ASSOCIATION_RETAIN policy specifies that the array retains the associated object. When the array is deallocated,however (at point 2),overview is released and so in this case also deallocated.