生成iPhone的唯一标实UUID

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NSString * strUUID = (NSString *)[SPIMyUUID load:@"KEY_USERNAME_PASSWORD"];   //首次执行该方法时，uuid为空 if ([strUUID isEqualToString:@""] || !strUUID) {     //生成一个uuid的方法     CFUUIDRef uuidRef = CFUUIDCreate(kCFAllocatorDefault);       strUUID = (NSString *)CFBridgingRelease(CFUUIDCreateString (kCFAllocatorDefault,uuidRef));   }   NSLog(@"%@",strUUID);