iOS How Do I Filter Characters That the User is Entering into a UITextField?

[kaydell.leavitt]

I have several UITextFields in which the user can enter numbers representing money. I want to enable the user to only type in the digits zero through nine and the decimal point (a comma or a period).

How can I filter-out the characters that aren't allowed to be part of a currency string?

-- Kaydell

 

[robbieduncan]

Have you looked at the documentation? If so what? You need to learn to find the answers for yourself.

 

[kaydell.leavitt]

Documentation

Have you looked at the documentation? If so what? You need to learn to find the answers for yourself.

Here is the documentation that I'm looking at:

UITextFieldDelegate Protocol Reference
http://developer.apple.com/iphone/l.../UITextFieldDelegate/UITextFieldDelegate.html

UITextField Class Reference
http://developer.apple.com/iphone/l.../UITextField_Class/Reference/UITextField.html

I'm thinking that I can make my own custom class that adheres to the UITextFieldDelegate protocol and set it for my text fields and then implement the method:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string

Am I on the right track?

 

[robbieduncan]

Yes. Unless there are pre-built formatters available. There are for Mac OSX. I'm not sure about the iPhone OS