保留目标 C 中的计数返回 -1
我是 Objective C 的新手，我有一个 NSMutableArray，其中有 3 个对象，然后我尝试打印数组的保留计数。为什么最终retainCount返回-1？谢谢
NSLog(@"myArray has retain count of %d", [myArray retainCount]);
[myArray release];
NSLog(@"myArray has retain count of %d", [myArray retainCount]);
控制台结果：
2010-10-17 11:58:06.407 TestRetainCount [527:a0f] myArray has retain count of 1
2010-10-17 11:58:06.407 TestRetainCount [527:a0f] myArray has retain count of -1
I'm new to objective C, I have a NSMutableArray with 3 objects in it, then I try to print the retainCount of the array. Why the final retainCount return -1? Thanks
NSLog(@"myArray has retain count of %d", [myArray retainCount]);
[myArray release];
NSLog(@"myArray has retain count of %d", [myArray retainCount]);
Result from console:
2010-10-17 11:58:06.407 TestRetainCount [527:a0f] myArray has retain count of 1
2010-10-17 11:58:06.407 TestRetainCount [527:a0f] myArray has retain count of -1
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对象被释放后（这可能发生在释放之后），您不能再依赖其数据的完整性。您试图在保留计数变得无效后信任它。
一般而言，不要使用保留计数。曾经。使用内存管理编程指南中的规则，您将始终获得正确的引用计数。
After an object has been deallocated (which may happen after a release), you can no longer rely on its data being intact. You're trying to trust the retain count after it has become invalid.
On a general note, don't use the retain count. Ever. Use the rules in the memory management programming guide, and you'll always get the reference counting correct.
格雷厄姆·李回答了针对您的示例的问题。
不是特定于您的示例，而是您的问题（主题）：
UINT_MAX通常用于表示不使用引用计数的对象（例如，永远不会释放，例如单例），或自定义引用计数的实现。Graham Lee answered the question specific to your example.
not specific to your example, but to your question (subject):
UINT_MAXis often used to denote an object which uses no reference counting (e.g., is never deallocated, such as a singleton), or a custom reference counting implementation.由于定时自动释放对象，无法依赖准确的保留计数。也就是说，计算您的 alloc/init、new、retains 等...并与相应的版本匹配。
Can't rely on an accurate retainCount because of the timing autoreleased objects. That said, count your alloc/init, new, retains, etc... and match with corresponding release.