Notifies the receiver that it is about to become first responder in its window.

报告接受者它将要在window 上成为为第一响应者。 默认返回 YES。

youdao

Notifies the receiver that it is about to become first responder in its window.

报告接受者它将要在window 上成为为第一响应者。 默认返回 YES。

youdao