As an example, a text field in the middle of editing might want to implement this method to return NO to force the user to finish editing.
举个例子，一个文本框如果返回了NO那他就会强制结束用户的编辑。
As an example, a text field in the middle of editing might want to implement this method to return NO to force the user to finish editing.
举个例子，一个文本框如果返回了NO那他就会强制结束用户的编辑。
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