let predicate = NSPredicate(format: "title CONTAINS %@", searchBar.text!)
// %@ : attribute name
// CONTAIN (String comparison operators)
// IN, BETWEEN ...
title에서 text를 포함하는 조건으로 검색 설정
공식문서 | https://developer.apple.com/documentation/foundation/nspredicate
CheetSheet | https://academy.realm.io/posts/nspredicate-cheatsheet/
NSpredicate | https://nshipster.com/nspredicate/