objective-c - 如何释放通过 objc_setAssociatedObject 关联的对象？

Question

如果我使用一个类别，该类别使用 objc_setAssociatedObject 向对象添加伪属性，我如何确保它们被正确释放？我是否必须在 dealloc 中手动释放它们？

Answer 1

您分配的行为决定了如何为该类型管理内存。如果您选择保留或复制，则当您添加关联引用的类的实例被释放时，该对象将被释放。这使得保留和复制行为操作成为 Objective-C 类的首选。只要在完成对象后将引用设置为 nil，Assign 也可用于避免循环保留。

Constants

OBJC_ASSOCIATION_ASSIGN Specifies a weak reference to the associated object.

OBJC_ASSOCIATION_RETAIN_NONATOMIC Specifies a strong reference to the associated object, and that the association is not made atomically.

OBJC_ASSOCIATION_COPY_NONATOMIC Specifies that the associated object is copied, and that the association is not made atomically.

OBJC_ASSOCIATION_RETAIN Specifies a strong reference to the associated object, and that the association is made atomically.

OBJC_ASSOCIATION_COPY Specifies that the associated object is copied, and that the association is made atomically.