目标-c 保留、转让和复制?
原文：objective-c retain , assign and copy?
原文：objective-c retain , assign and copy?
我删除了前一篇文章... 如果我有一个拥有一个对象的类别, 我该使用哪个? 我知道如果该对象不是该类拥有的, 它需要保留 。 @ class A @ property( stay)...
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