CPF和CNPJ的格式文本字段 [英] Format textfield for CPF and CNPJ

问题描述

我应如何处理iOS中的文本格式?我不是在谈论货币或小数样式.由于iOS没有 setFormat()，因此有点复杂.

How should I handle text formatting in iOS? I'm not talking about Currency or Decimal styles. Since iOS doesn't have setFormat(), it's kind of complicated.

我想要的格式的两个示例: 123.456.789-10 和 123.456.789/1000-00 .

Two examples of the format I want: 123.456.789-10 and 123.456.789/1000-00.

我的目标是在用户键入内容时格式化文本字段.就像任何普通的网站一样，例如，当您键入电话号码时.它不是来自模型或其他任何东西.用户只需要输入数字，必要时我就插入."，"/" 或-" .

My aim is to format a text field as the user types. Like any normal site does when, for example, you type a phone number. It doesn't comes from a model or anything. The user just needs to type the numbers and when necessary I'll insert the ".","/" or "-".

推荐答案

您可以使用正则表达式进行格式化，例如:

You can use regular expressions to do formatting, like this:

NSRegularExpression *fmt = [NSRegularExpression
    regularExpressionWithPattern:@"(.{1,3})(.{1,3})(.{1,3})(.{1,2})"
                         options:0
                           error:NULL];
NSMutableString *str = [NSMutableString stringWithString:@"12345678910"];
[fmt replaceMatchesInString:str
                    options:0
                      range:NSMakeRange(0, str.length)
               withTemplate:@"$1.$2.$3-$4"];

这会将字符串转换为 123.456.789-10

为了在用户键入时动态应用此格式，请预先创建 NSRegularExpression * fmt ，将其存储在 UITextFieldDelegate 中，并在 textField中使用它:shouldChangeCharactersInRange:replacementString:方法.

In order to apply this formatting dynamically as users type, create NSRegularExpression *fmt upfront, store it in your UITextFieldDelegate, and use it in your textField:shouldChangeCharactersInRange:replacementString: method.

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