本文详细介绍了iOS中线程安全的类和函数，包括NSArray、NSAttributedString等，并列举了线程不安全的类如NSAutoreleasePool，以及仅限主线程使用的类如NSAppleScript。了解这些内容对于iOS开发者在多线程环境中正确使用API至关重要。
Thread-Safe Classes and Functions
The following classes and functions are generally considered to be thread-safe. You can use the same instance from multiple threads without first acquiring a lock.
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NSDecimalfunctions -
Object allocation and retain count functions
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Zone and memory functions
Thread-Unsafe Classes
The following classes and functions are generally not thread-safe. In most cases, you can use these classes from any thread as long as you use them from only one thread at a time. Check the class documentation for additional details.
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NSHashTablefunctions -
NSMapTablefunctions -
User name and home directory functions
Note that although NSArchiver, NSCoder, and NSEnumerator objects are themselves thread-safe, they are listed here because it is not safe to change the data objects wrapped by them while they are in use. For example, in the case of an archiver, it is not safe to change the object graph being archived. For an enumerator, it is not safe for any thread to change the enumerated collection.
Main Thread Only Classes
The following class must be used only from the main thread of an application.
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