//内连，使用情况较多下使用，

staticinline NSString * GetUUIDString()

{

   CFUUIDRef uuidObj = CFUUIDCreate(nil);

   NSString *uuidString = (__bridge_transfer NSString*)CFUUIDCreateString(nil, uuidObj);

   CFRelease(uuidObj);

   return uuidString;

}

//类方法，建议新建NSString的分类使用，

+ (NSString*) getUUIDString

{

   CFUUIDRef uuidObj = CFUUIDCreate(nil);

   NSString *uuidString = (__bridge_transfer NSString*)CFUUIDCreateString(nil, uuidObj);

   CFRelease(uuidObj);

   return uuidString;

}

iOS生成UUID