在UITextField中验证货币输入的最佳方法是什么？ [英] What's the best way to validate currency input in UITextField?

问题描述

我的应用程序允许用户在 UITextField 控件中输入数值（货币），但遗憾的是我希望的键盘布局不是其中之一-in options，所以我不得不在Interface Builder中选择Numbers& Punctuation选项。这是IB中相应的对话窗口：

My application allows the user to enter a numeric value (currency) in a UITextField control, but the keyboard layout that I wish was available is unfortunately not one of the built-in options, so I had to choose the "Numbers & Punctuation" option in Interface Builder. Here's the corresponding dialog window in IB:

因此，当我的应用程序询问用户输入时，它显示以下内容：

So when my application asks the user for the input, it is displaying the following:

这完全没问题，但请查看用户可用的所有额外密钥！人们可以很容易地输入12; 56！在文本字段中，我假设我必须以某种方式验证。

Which is perfectly fine, but look at all of the extra keys available to the user! One could easily enter "12;56!" in the text field, and I assume I have to validate that somehow.

所以我的问题是：如何验证输入的货币值？ UITextField ？

So my question is: how do I validate currency values entered into a UITextField?

推荐答案

也许您可以附加 UITextFieldDelegate 在控件上并实现 textField：shouldChangeCharactersInRange：replacementString： 这样，如果它看到任何在字段中你不想要的字符，它可以拒绝它们。

Perhaps you could attach a UITextFieldDelegate on the control and have it implement textField:shouldChangeCharactersInRange:replacementString: That way, if it sees any characters that you don't want in the field, it can reject them.

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