生成UUID

- (NSString *)getIOSUUID

{

    

    CFUUIDRef uuid =CFUUIDCreate(NULL);

    assert(uuid !=NULL);

    CFStringRef uuidStr =CFUUIDCreateString(NULL, uuid);

    

    NSString* retrieveuuid = [NSStringstringWithFormat:@"%@", uuidStr];

    

    return retrieveuuid;

}