MPNumericTextField is a class that extends the basic UITextField to make you easily input formatted numbers in a text field.

It correctly handles decimal numbers, integer numbers, percentages and currency values, using either the current locale or a manually provided one.

Installation

Manually

Just add to your project these main files:

1. MPNumericTextField.h
2. MPNumericTextField.m
3. MPNumericTextFieldDelegate.h
4. MPNumericTextFieldDelegate.m
5. MPFormatterUtils.h
6. MPFormatterUtils.m

that can be found inside the Classes folder.

Usage

You can create a very simple numeric text field using:

MPNumericTextField *textField = [[MPNumericTextField alloc] init];

This will create a text field that will handle the input of decimal numbers, using the current locale and the local text field delegate implementation (see MPNumericTextFieldDelegate.{h|m}).

Decimal, percentage or currency?

You can change the default number style for the text field via the type property. It can be set to one of these values:

1. MPNumericTextFieldDecimal (default one)
2. MPNumericTextFieldInteger
3. MPNumericTextFieldCurrency
4. MPNumericTextFieldPercentage

Eg. to change the number style of your text field to currency just do:

numericTextField.type = MPNumericTextFieldCurrency;

Getting and setting the numeric value

You can access the numeric value of your text field via the numericValue property. Eg:

MPNumericTextField *textField = [[MPNumericTextField alloc] init];
textField.type = MPNumericTextFieldPercentage;
textField.numericValue = @(2.25);

// ... (make changes to the text field) ...

NSNumber *currentValue = textField.numericValue;

Locales

By default behavior the MPNumericTextField will use the [NSLocale currentLocale] locale. But you can easily change this property too:

numericTextField.locale = myCustomLocale;

Custom currencies

When using MPNumericTextField for displaying currencies, an old limitation was to be stuck with the currency code provided by NSLocale.

Starting from v. 1.3.0 it's possible to set a custom currency code to represent those values using the desired currency:

numericTextField.currencyCode = @"JPY";

Delegates

The MPNumericTextField class seamlessly uses the MPNumericTextFieldDelegate class as its own delegate. This delegate handles all the logics that makes the text field draw numbers with the correct format while the user inserts numbers.

You can decide to set a new custom delegate for your objects, and the MPNumericTextField will treat them as forward delegates to make them work correctly with the existing one.

Unlike version 1.0.0 of this library, starting from 1.1.0 you can start using the standard -setDelegate: and -delegate methods from UITextField to set up your custom delegates without worrying about the basic numeric field functionalities.

Bonus: placeholder color

You can choose to change the default placeholder color in your text field. Just use the placeholderColor property:

numericTextField.placeholderColor = [UIColor redColor];

If this property is set to nil, it will use the default system color.

Support

Feel free to apport changes to the source code of this project and to send a pull request on Github to merge your contribution to the original project.

If you need further assistance, please contact me on Twitter: @marzapower.

Release notes

Version 1.4.0

• [new] The new MPTextField class opens the usage of placeholderColor outside of the handling of the numeric text field
• [fix] No more default right alignement for the text field if loaded from a NIB file

Version 1.3.0

• [new] Custom currency codes for the text field
• [new] Nullability modifiers for the utility methods in MPFormatterUtils

Version 1.2.1

• [fix] Doesn't use cached locale anymore when system locale changes

Version 1.2.0

• [New] Added support to integer-only numbers with MPNumericTextFieldInteger
• [Enh] Better support for Swift integration

Version 1.1.0

• [Fix] Added support for all delegate methods in MPNumericTextFieldDelegate
• [New] Added support for custom delegates without boilerplate code
• [New] Added IB_DESIGNABLE keyword to MPNumericTextField
• [Enh] Some little code enhancements

Version 1.0.0

• First public release