自动释放 CFMutableDictionary
如何自动释放 CFMutableDictionary？
我像这样创建它：
self.mappingByMediatedObject = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
在 dealloc 中：
self.mappingByMediatedObject = nil;
How do I autorelease a CFMutableDictionary?
I'm creating it like this:
self.mappingByMediatedObject = CFDictionaryCreateMutable(NULL, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
And in dealloc:
self.mappingByMediatedObject = nil;
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
CoreFoundation 没有自动释放的概念——那是 Cocoa 级别的构造。但是，对于 "免费"桥接 跨越字符串和集合类等世界，您可以通过将 CF 引用转换为其相应的 Cocoa 引用，并向其发送
-autorelease消息，可以获得相同的结果，如下所示：但是，在您的情况下，您可能并不真正想在此处使用 autorelease，因为您不会将参考资料交还给 Cocoa 调用者。为什么不更明确地分配您的分配，并在设置后释放它，如下所示：
CoreFoundation doesn't have a notion of autorelease-- that's a Cocoa-level construct. However, for the objects that are "toll-free" bridged across worlds like strings and the collection classes, you can get the same result by casting the CF reference to its corresponding Cocoa reference, and sending it the
-autoreleasemessage, like this:In your case, though, you might not really want to use autorelease here, because you're not handing back the reference for a Cocoa caller. Why not be a little more explicit around your allocation instead and just releasing it after setting it, like this:
CFDictionary和NSDictionary是免费桥接的。这意味着 CoreFoundation 对象和它的 Cocoa 对象是可以互换的。因此，要自动释放
CFDictionary，您可以编写以下内容：当然，仅当您的
mappingByMediatedObject属性保留其值时才自动释放字典 (@property(retain))CFDictionaryandNSDictionaryare toll-free bridged. This means the CoreFoundation object and its Cocoa counterpart are interchangable.So to autorelease a
CFDictionaryyou can write the following:Of course autorelease the dictionary only if your
mappingByMediatedObjectproperty retains its value (@property(retain))从 iOS7 和 Mac OS X 10.9 开始，您可以使用 Core-Foundation 自动释放函数 CFAutorelease()。
As of iOS7 and Mac OS X 10.9 you can use the Core-Foundation auto release function CFAutorelease().