使用CFPropertyListCreateDeepCopy时为什么会出现泄漏？

Question

我正在创建一个字典的深度可变副本，但由于某种原因我正在泄漏。我试过这个：

NSMutableDictionary *mutableCopy = (NSMutableDictionary *)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, sectionedDictionaryByFirstLetter, kCFPropertyListMutableContainers);
self.copyOfSectionedDictionaryByFirstLetter = mutableCopy;
CFRelease(mutableCopy);

而且：

copyOfSectionedDictionaryByFirstLetter = (NSMutableDictionary *)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, sectionedDictionaryByFirstLetter, kCFPropertyListMutableContainers);

两者都被界面构建器的泄漏设备标记。

有什么想法吗？

谢谢！

Answer 1

我的猜测是你保留了字典中的一个对象。泄漏的字节数是多少？

Answer 2

您是否真的在copyOfSectionedDictionaryByFirstLetter方法中发布了dealloc？

你要么必须这样做：

self.copyOfSectionedDictionaryByFirstLetter = nil;

或者：

[copyOfSectionedDictionaryByFirstLetter release];
copyOfSectionedDictionaryByFirstLetter = nil; // Just for good style

Answer 3

我怀疑NSMutableDictionary的直接案例令分析人员感到困惑。请尝试以下方法：

CFMutableDictionaryRef mutableCopy = CFPropertyListCreateDeepCopy(kCFAllocatorDefault, sectionedDictionaryByFirstLetter, kCFPropertyListMutableContainers);
if (mutableCopy) {
    // NOTE: you MUST check that CFPropertyListCreateDeepCopy() did not return NULL.
    // It can return NULL at any time, and then passing that NULL to CFRelease() will crash your app.
    self.copyOfSectionedDictionaryByFirstLetter = (NSMutableDictionary *)mutableCopy;
    CFRelease(mutableCopy);
}

Answer 4

如果您多次呼叫以下部分：

NSMutableDictionary *mutableCopy = (NSMutableDictionary *)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, sectionedDictionaryByFirstLetter, kCFPropertyListMutableContainers);
self.copyOfSectionedDictionaryByFirstLetter = mutableCopy;
CFRelease(mutableCopy);

你应该把它改成：

NSMutableDictionary *mutableCopy = (NSMutableDictionary *)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, sectionedDictionaryByFirstLetter, kCFPropertyListMutableContainers);
[self.copyOfSectionedDictionaryByFirstLetter release];
self.copyOfSectionedDictionaryByFirstLetter = mutableCopy;
CFRelease(mutableCopy);

我想这可能是你泄密的原因。