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POStruggling with currency in Cocoa
 

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    <p>I'm trying to do something I'd think would be fairly simple: Let a user input a dollar amount, store that amount in an NSNumber (NSDecimalNumber?), then display that amount formatted as currency again at some later time. </p> <p>My trouble is not so much with the setNumberStyle:NSNumberFormatterCurrencyStyle and displaying floats as currency. The trouble is more with how said numberFormatter works with this UITextField. I can find few examples. <a href="https://stackoverflow.com/questions/276382/best-way-to-enter-numeric-values-with-decimal-points">This thread</a> from November and <a href="https://stackoverflow.com/questions/317311/obtaining-an-nsdecimalnumber-from-a-locale-specific-string">this one</a> give me some ideas but leaves me with more questions.</p> <p>I am using the UIKeyboardTypeNumberPad keyboard and understand that I should probably show $0.00 (or whatever local currency format is) in the field upon display then as a user enters numerals to shift the decimal place along:</p> <ul> <li>Begin with display $0.00</li> <li>Tap 2 key: display $0.02 </li> <li>Tap 5 key: display $0.25</li> <li>Tap 4 key: display $2.54</li> <li>Tap 3 key: display $25.43</li> </ul> <p>Then [numberFormatter numberFromString:textField.text] should give me a value I can store in my NSNumber variable. </p> <p>Sadly I'm still struggling: Is this <em>really</em> the best/easiest way? If so then maybe someone can help me with the implementation? I feel UITextField may need a delegate responding to every keypress but not sure what, where and how to implement it?! Any sample code? I'd greatly appreciate it! I've searched high and low...</p> <p><strong>Edit1:</strong> So I'm looking into NSFormatter's <strong>stringForObjectValue:</strong> and the closest thing I can find to what benzado recommends: <strong>UITextViewTextDidChangeNotification</strong>. Having really tough time finding sample code on either of them...so let me know if you know where to look?</p>
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    1. COCute title, but it will be impossible to search for in the future for people with a similar problem.
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    2. COi thought about that but "Currency" is mentioned everywhere as well as in a tag.
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    3. COI changed it anyway. If you roll it back, I won't fight you.
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