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並前往https://books.google.com.tw/books?id=xCYiAgAAQBAJ&pg=PA309&lpg=PA309&dq=becomefirstresponder&source=bl&ots=VP1PQBhlBw&sig=ACfU3U1klwbRVXhiR5g_Vlvst8ogsgj8Qg&hl=zh-TW&sa=X&ved=2ahUKEwjGhvCC6IT0AhUGRDABHUEdCOoQ6AF6BQiQAhAD

Creating iOS Apps: Develop and Design - 第 309 頁 - Google 圖書結果

But, calling becomeFirstResponder won't work either (OK, there are two catches). Currently, our controller's canBecomeFirstResponder method returns NO.

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