Black Friday ‘sale’

2013-11-27kenl

Even better than a sale, HouseCat Home Inventory is FREE this entire weekend! Starting Thanksgiving Day and lasting the entire weekend, HouseCat Home Inventory is available for free download.

Download it for free from iTunes.

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Formatting UITextField input as currency

2013-11-13kenl

 

In both of my apps, the user may input a price or cost text field. I want this to look good no matter the user’s locale.
This snippet does the following:
– adds the localized currency symbol if necessary.
– if user inputs only dollar amount, append zero cents with the appropriate decimal separator.
 
i.e. with US_EN locale, change 
42 -> $42.00
$42 -> $42.00
42.4 -> $42.40
42.00 -> $42.00
$42.00 -> $42.00 (no change, no crash)
The one case it won’t handle is:
$42.4 does not produce $42.40
 
Russian:
42 -> 42,00 руб.
etc.
 
Germany:
42 -> 42,00 €
etc.
 
Note that if you will need to do any calculations with the number, you will obviously need to save it off before you modify the corresponding text string.
 
 
Example:
– (void)textFieldDidEndEditing:(UITextField *)textField
{
if( aPriceField == textField )
{
// if needed, save unmodified text string as decimal number here
[self formatCurrencyField:textField];
}
}
 
 
 
code:
– (void)formatCurrencyField:(UITextField *)textField
{
   NSLocale* currentUserLocale = [NSLocale currentLocale];
   
   // If the user just typed the number in, e.g. 12.34 or 42, prepend the currency symbol:
   NSString *currencySymbol = [currentUserLocale objectForKey:NSLocaleCurrencySymbol];
   
   NSRange strRange = [textField.text rangeOfString:currencySymbol];
   if (strRange.location == NSNotFound)
   {
      NSString *numberStr = [NSNumberFormatter localizedStringFromNumber:[NSDecimalNumber numberWithFloat:[textField.text floatValue]]
                                                             numberStyle:NSNumberFormatterCurrencyStyle];
      textField.text = numberStr;
   }
   else
   {
      // contains a currency symbol, but we don’t know if it’s in the form $xx.nn or just $xx.
      // If it’s $xx, we want to change it to $xx.00:
      NSString *decimalSeparator = [currentUserLocale objectForKey:NSLocaleDecimalSeparator];         
      NSRange resultsRange = [textField.text rangeOfString:decimalSeparator
                                                   options:NSCaseInsensitiveSearch];
      if(resultsRange.location == NSNotFound)
      {
         // number is in form $XX, change it to $XX.00:
         NSNumberFormatter *costFmt = [[NSNumberFormatter alloc] init];
         [costFmt setNumberStyle:NSNumberFormatterCurrencyStyle];
         
         NSNumber* floatNum = [costFmt numberFromString:textField.text];
         NSNumber *costNum=[NSNumber numberWithFloat:[floatNum floatValue]];
         NSString* costStr = [costFmt stringFromNumber:costNum];
         
         textField.text = costStr;
      }
   }
}
 

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Keeping active UITextField in view above keyboard

2013-11-11kenl

For my current project, I have a few UITextFields in a UIScrollView. I’m also using BSKeyboardControls for navigation between the fields.

However, the scrolling wasn’t working.  I could get it to do some sort of scrolling, and it was mostly in the general direction that I wanted, but there were problems. The main hangup was that there was a place in the view where there are two text fields with the same y position (side by side). Navigating between those two fields would cause the view to scroll up, down, too far, not far enough, etc.

Turns out that I neglected to set the UIScrollView delegate in IB. Once I did that, it started working as expected. I’m glad I only wasted about five hours trying to figure it out…

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