NARC！ :)

如果您调用的方法包含 N ew， A lloc， R 容器或 C opy ，那么您必须release或autorelease.否则，请不要触摸它.

If you invoked a method that contains N ew, A lloc, R etain, or C opy, then you must release or autorelease. Otherwise you don't touch it.

当然，文档中明确指出的任何内容都比这条规则重要.

Of course, anything the documentation explicitly says trumps this rule.

另一件事是，当您处理C函数时，NARC规则仍然适用，但还会获得Create规则:如果该函数包含"create"，则您负责CFReleasing或释放返回的数据.

The other thing is that when you're dealing with C function the NARC rule still applies, but also gets the Create rule: if the function contains "create", then you're responsible for CFReleasing or freeing the returned data.