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如何检测是否使用UITextFieldViewModeWhileEditing清除了UITextField

[英]How to detect if a UITextField was cleared using the UITextFieldViewModeWhileEditing

there is a UITextField which has a clear button implemented as follows: 有一个UITextField ,它具有一个清除按钮,实现如下:

myUITextField.clearButtonMode = UITextFieldViewModeWhileEditing

How do I detect if the UITextField was cleared using the clear button? 如何检测是否使用清除按钮清除了UITextField

As far as I know you can only detect if UITextField is empty. 据我所知,您只能检测UITextField是否为空。 Is there specific reason you want to detect this specific clear button? 您是否有特定原因要检测此特定的清除按钮?

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