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Setting the prefix from the currency's suffix #4

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Setting the prefix from the currency's suffix #4

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67 changes: 40 additions & 27 deletions FormattedCurrencyInput/ViewController.m
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Original file line number Diff line number Diff line change
Expand Up @@ -19,13 +19,17 @@ @implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
_textField.delegate = self;
_textField.delegate = self;

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[numberFormatter setMaximumFractionDigits:2];
[numberFormatter setMinimumFractionDigits:2];


NSString *currencySymbol = [[numberFormatter currencySymbol] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
[numberFormatter setPositivePrefix:currencySymbol];
[numberFormatter setPositiveSuffix:@""];

_textField.text = [numberFormatter stringFromNumber:[NSNumber numberWithInt:0]];
}

Expand All @@ -42,24 +46,28 @@ - (void)didReceiveMemoryWarning
- (IBAction)valueButton:(id)sender
{
NSString *textFieldStr = [NSString stringWithFormat:@"%@", _textField.text];

NSMutableString *textFieldStrValue = [NSMutableString stringWithString:textFieldStr];

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];

[textFieldStrValue replaceOccurrencesOfString:numberFormatter.currencySymbol
NSString *currencySymbol = [[numberFormatter currencySymbol] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
[numberFormatter setPositivePrefix:currencySymbol];
[numberFormatter setPositiveSuffix:@""];

[textFieldStrValue replaceOccurrencesOfString:currencySymbol
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [textFieldStrValue length])];

[textFieldStrValue replaceOccurrencesOfString:numberFormatter.groupingSeparator
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [textFieldStrValue length])];

NSDecimalNumber *textFieldNum = [NSDecimalNumber decimalNumberWithString:textFieldStrValue];

UIAlertView* alert = [[UIAlertView alloc] initWithTitle:nil
message:[NSString stringWithFormat:@"Value: %@, Number: %@", textFieldStr, textFieldNum]
delegate:nil
Expand All @@ -71,63 +79,68 @@ - (IBAction)valueButton:(id)sender
- (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString*)string
{
NSInteger MAX_DIGITS = 11; // $999,999,999.99

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[numberFormatter setMaximumFractionDigits:2];
[numberFormatter setMinimumFractionDigits:2];


// Set currency symbol as prefix
NSString *currencySymbol = [[numberFormatter currencySymbol] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
[numberFormatter setPositivePrefix:currencySymbol];
[numberFormatter setPositiveSuffix:@""];

NSString *stringMaybeChanged = [NSString stringWithString:string];
if (stringMaybeChanged.length > 1)
{
NSMutableString *stringPasted = [NSMutableString stringWithString:stringMaybeChanged];
[stringPasted replaceOccurrencesOfString:numberFormatter.currencySymbol

[stringPasted replaceOccurrencesOfString:currencySymbol
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [stringPasted length])];

[stringPasted replaceOccurrencesOfString:numberFormatter.groupingSeparator
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [stringPasted length])];

NSDecimalNumber *numberPasted = [NSDecimalNumber decimalNumberWithString:stringPasted];
stringMaybeChanged = [numberFormatter stringFromNumber:numberPasted];
}

UITextRange *selectedRange = [textField selectedTextRange];
UITextPosition *start = textField.beginningOfDocument;
NSInteger cursorOffset = [textField offsetFromPosition:start toPosition:selectedRange.start];
NSMutableString *textFieldTextStr = [NSMutableString stringWithString:textField.text];
NSUInteger textFieldTextStrLength = textFieldTextStr.length;

[textFieldTextStr replaceCharactersInRange:range withString:stringMaybeChanged];
[textFieldTextStr replaceOccurrencesOfString:numberFormatter.currencySymbol
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [textFieldTextStr length])];

[textFieldTextStr replaceOccurrencesOfString:currencySymbol
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [textFieldTextStr length])];

[textFieldTextStr replaceOccurrencesOfString:numberFormatter.groupingSeparator
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [textFieldTextStr length])];

[textFieldTextStr replaceOccurrencesOfString:numberFormatter.decimalSeparator
withString:@""
options:NSLiteralSearch
range:NSMakeRange(0, [textFieldTextStr length])];

if (textFieldTextStr.length <= MAX_DIGITS)
{
NSDecimalNumber *textFieldTextNum = [NSDecimalNumber decimalNumberWithString:textFieldTextStr];
NSDecimalNumber *divideByNum = [[[NSDecimalNumber alloc] initWithInt:10] decimalNumberByRaisingToPower:numberFormatter.maximumFractionDigits];
NSDecimalNumber *textFieldTextNewNum = [textFieldTextNum decimalNumberByDividingBy:divideByNum];
NSString *textFieldTextNewStr = [numberFormatter stringFromNumber:textFieldTextNewNum];

textField.text = textFieldTextNewStr;

if (cursorOffset != textFieldTextStrLength)
{
NSInteger lengthDelta = textFieldTextNewStr.length - textFieldTextStrLength;
Expand All @@ -137,7 +150,7 @@ - (BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange
[textField setSelectedTextRange:newRange];
}
}

return NO;
}

Expand Down