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並前往https://developer.apple.com/documentation/uikit/uiresponder/1621113-becomefirstresponder

becomeFirstResponder() | Apple Developer Documentation

becomeFirstResponder (). Asks UIKit to make this object the first responder in its window. Availability. iOS 2.0+; iPadOS 2.0+; Mac Catalyst 13.0+; tvOS 9.0+.

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