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並前往https://books.google.com.tw/books?id=1eA2RGmEcSYC&pg=PA136&lpg=PA136&dq=becomefirstresponder&source=bl&ots=cjiWn4z4EY&sig=ACfU3U312CExlSYqUKt2v4S7_aEY9kvYLQ&hl=zh-TW&sa=X&ved=2ahUKEwjGhvCC6IT0AhUGRDABHUEdCOoQ6AF6BQiRAhAD

iOS Programming: The Big Nerd Ranch Guide, Third Edition

becomeFirstResponder method returns a Boolean value indicating whether the receiving object successfully became the first responder of the window.

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