ios - UITextField clearsOnInsertion 不起作用

Question

我设置

textField.clearsOnInsertion=YES

但什么也没发生。我正在使用 XCode 5.0 和 iOS 7.0

Answer 1

你首先要弄清楚什么是clearsOnInsertion。请参阅 Apple 的文档:

clearsOnInsertion

A Boolean value indicating whether inserting text replaces the previous contents.

Discussion

The default value of this property is NO. When the value of this property is YES and the text view is in editing mode, the selection UI is hidden and inserting new text clears the contents of the text view and sets the value of this property back to NO.

clearsOnInsertion 在我看来是非常无用的。看截图:

文本字段处于编辑模式并且显示键盘但隐藏选择 UI。当您输入任何内容时，它将替换旧文本。就是这样。

另一个相关的有用属性是clearsOnBeginEditing

clearsOnBeginEditing

A Boolean value indicating whether the text field removes old text when editing begins.