Obj-C：参考还是副本？
产品项是副本，还是只是对 NSArray 中对象的引用？是否需要释放？考虑到没有分配，我认为不需要释放，对吗？
ProductItem *item = [appDelegate.productTextList objectAtIndex:[indexPath row]];
Is the product item a copy, or just a reference to the object in the NSArray? Does it need to be released? Considering there is no alloc, I assume there is no need for release, correct?
ProductItem *item = [appDelegate.productTextList objectAtIndex:[indexPath row]];
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它是指向
ProductItem类的指针。如果您采取了一些措施来增加对象的保留计数，则应该仅释放该对象。即
alloc/init、copy或调用retain。It is a pointer to the
ProductItemclass.You should only release an object if you have done something to increase it's retain count. I.e.
alloc/init,copy, or callretain.它只是一个
ProductItem类型的指针，所以它不是一个副本。您的引用保证在对 objectAtIndex 的调用范围内有效（它在对象上调用 autorelease）。如果您想将其保留更长时间，则需要保留它并负责在使用完毕后将其释放。
It's just a pointer of type
ProductItem, so it's not a copy.Your reference is guaranteed to be valid in the scope of the call to objectAtIndex (it calls autorelease on the object). If you want to keep it around for longer you need to retain and are responsible to release it when you are done with it.