iOS开发技巧：使用Objective-C创建UUID的代码

- (NSString *)createUUID

{

// Create universally unique identifier (object)

CFUUIDRef uuidObject = CFUUIDCreate(kCFAllocatorDefault);

// Get the string representation of CFUUID object.

NSString *uuidStr = [(NSString *)CFUUIDCreateString(kCFAllocatorDefault, uuidObject) autorelease];

// If needed, here is how to get a representation in bytes, returned as a structure

// typedef struct {

// UInt8 byte0;

// UInt8 byte1;

// ...

// UInt8 byte15;

// } CFUUIDBytes;

CFUUIDBytes bytes = CFUUIDGetUUIDBytes(uuidObject);

CFRelease(uuidObject);

return uuidStr;

}