How can we define an input mask like $d,ddd.dd for data entry in a UITextField for an iPhone app?
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Neeku
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possible duplicate of [Re-Apply currency formatting to a UITextField on a change event](http://stackoverflow.com/questions/2388448/re-apply-currency-formatting-to-a-uitextfield-on-a-change-event) – PengOne Sep 10 '11 at 19:49
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possible duplicate of [Obj-C, iOS, how do I format a UITextField for currency international?](http://stackoverflow.com/questions/5850089/obj-c-ios-how-do-i-format-a-uitextfield-for-currency-international) – jscs Sep 10 '11 at 21:39
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You want to use an NSNumberFormatter to go back and forth between a value 1234.56 and a string @"$1,234.56".
Apple has a very good Data Formatting Guide to walk you through setting up and using a currency formatter.
In order to integrate this with a UITextField, you will want to use the delegate method
– textField:shouldChangeCharactersInRange:replacementString:
This allows you to validate and update characters as the user types them in. For an example of how to implement this, look at this post: Re-Apply currency formatting to a UITextField on a change event
