Currency in UITextField - ios

Question

I have a UITextField in which the user enters an amount of money. I am trying to make the textField show the current money symbol, as the user types in an amount.
So far I was able to do that in textFieldDIdEndEditing:, how can I do the following code in a method that lets you change as the user types. (For example shouldChangeTextInRange:.) This way the currency will always show, not only when the user is finished entering the amount.
Here is what I have so far:
- (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;
}
The reason why I don't just insert it in a UILabel is because some places have their currency after the amount. (Ex. France)

Answer 1

Create a UIImageView with currency image.
And then set leftView either RightView of UITextField as per your requirement.
UIImage *cImage = [UIImage imageNamed:#"currency.png"];
UIImageView *imageView = [[UIImageView alloc] initWithImage:cImage];
[imageView setFrame:CGRectMake(0, 0, 40, 40)];
// For Left
[textfield setLeftView:imageView];
// or
// For Right
[textfield setRightView:imageView];

Answer 2

Try this.
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
if (textField == txtAmount) {
if ([txtAmount.text isEqualToString:#""]) {
txtAmount.text = #"$";
}else{
txtAmount.text = [NSString stringWithFormat:#"%#",txtAmount.text];
}
}
return YES;
}
- (BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
if (textField == txtAmount) {
if ([txtAmount.text isEqualToString:#"$"]) {
txtAmount.placeholder = #"Amount";
}
}
return YES;
}
and don't forget to give delegate to the UITextField.