https://stackoverflow.com/questions/24850632/method-definition-not-found-in-xcode


https://riptutorial.com/ko/objective-c/example/17035/%EA%B0%92-%EC%A0%84%EB%8B%AC-%EB%A7%A4%EA%B0%9C-%EB%B3%80%EC%88%98-%EC%A0%84%EB%8B%AC



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