Format currency with UITextField

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C

Objective-C

I have a UITextField that the user will enter an amount of money. I want to set it so it will show the users currency. I could do the following:

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    NSNumberFormatter *currencyFormatter = [[[NSNumberFormatter alloc] init] autorelease];
    [currencyFormatter setLocale:[NSLocale currentLocale]];
    [currencyFormatter setMaximumFractionDigits:2];
    [currencyFormatter setMinimumFractionDigits:2];
    [currencyFormatter setAlwaysShowsDecimalSeparator:YES];
    [currencyFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];

    NSNumber *someAmount = [NSNumber numberWithDouble:[textField.text doubleValue]];
    NSString *string = [currencyFormatter stringFromNumber:someAmount];

    textField.text = string;
}

That works. But I want it to show on startup, and while the user is typing the amount. The above code only works when the user is finished with that textField. How can I make the code in that method to show on startup and while the user is entering numbers.

I tried to change the method to shouldChangeTextInRange, but it gives a weird effect.