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[iOS-Dev] nil NSNull Nil NULL

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Published: 21 Jan 2018 › Updated: 21 Jan 2018[iOS-Dev] nil NSNull Nil NULL

[iOS-Dev] nil NSNull Nil NULL

iOS 개발을 새로 시작하는데..
이런 몰랐던 내용이라서..

object가 nil 이면 오히려 크래쉬가 발생하지 않고
nil 체크를 열심히 하고도 NSNull 때문에 죽는 경우가 있다니..

  • NULL : pointer null
  • nil : object null
  • Nil : class null
  • NSNull : singletone object used to represent null

http://nshipster.com/nil/
http://maskkwon.tistory.com/236
https://soulpark.wordpress.com/2012/08/30/objective_c_understanding-nil/

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