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我怎么知道 NSTextField 什么时候获得了焦点?
当用户在我的 NSTextField 中单击(或以其他方式选择)鼠标时,是否有一个委托方法会告诉我?
谢谢
汤姆
子类 NSTextField 并覆盖-becomeFirstResponder。
-becomeFirstResponder