If one of the invalid characters is in the label string, or the string is empty, the user is notified of the error and the label is returned to its previous text.

如果标签字符串中有一个无效字符，或者该字符串为空，则将向用户通知错误，同时标签返回到其以前的文本。

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If one of the invalid characters is in the label string, or the string is empty, the user is notified of the error and the label is returned to its previous text.

如果标签字符串中有一个无效字符，或者该字符串为空，则将向用户通知错误，同时标签返回到其以前的文本。

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