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Add ability to delete or edit at cursor location #18

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62 changes: 42 additions & 20 deletions REFormattedNumberField/REFormattedNumberField.m
100644 → 100755
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Original file line number Diff line number Diff line change
Expand Up @@ -72,33 +72,55 @@ - (void)formatInput:(UITextField *)textField
__typeof (self) __weak weakSelf = self;
dispatch_async(dispatch_get_main_queue(), ^{
__typeof (self) __strong strongSelf = weakSelf;
UITextRange *startingRange = textField.selectedTextRange;
textField.text = [strongSelf.unformattedText re_stringWithNumberFormat:strongSelf.format];
strongSelf.currentFormattedText = textField.text;

NSUInteger index = [self offsetFromPosition:self.beginningOfDocument toPosition:startingRange.start];

NSString *remaining = [self.format substringFromIndex:MIN(index, self.format.length)];
NSString *next = [remaining substringToIndex:MIN(1, remaining.length)];

NSString *nonPlaceholderNext = [next stringByReplacingOccurrencesOfString:@"X" withString:@""];

NSString *before = [self.format substringToIndex:MIN(index, self.format.length)];
NSString *previous = [before substringFromIndex:MAX(((int)before.length)-1, 0)];
NSString *nonPlaceholderPrev = [previous stringByReplacingOccurrencesOfString:@"X" withString:@""];

UITextPosition *start = [self positionFromPosition:[self beginningOfDocument]
offset:MIN(index + nonPlaceholderNext.length + nonPlaceholderPrev.length, textField.text.length)];

[self setSelectedTextRange:[self textRangeFromPosition:start toPosition:start]];
[strongSelf sendActionsForControlEvents:UIControlEventEditingChanged];
});
}
}

- (void)deleteBackward
- (void)deleteFromRange:(NSRange)range
{
NSInteger decimalPosition = -1;
for (NSInteger i = self.text.length - 1; i > 0; i--) {
NSString *c = [self.format substringWithRange:NSMakeRange(i - 1, 1)];

if ([c isEqualToString:@"X"]) {
decimalPosition = i;
break;
}
}
// NSString *formattedStringToLocation = [self.format substringWithRange:NSMakeRange(0, range.location+range.length)];
NSString *nonPlaceholdersInStarting = [[self.format substringWithRange:NSMakeRange(0, range.location+range.length)] stringByReplacingOccurrencesOfString:@"X" withString:@""];
NSUInteger realLocation = range.location - nonPlaceholdersInStarting.length;

if (decimalPosition == -1) {
self.text = @"";
} else {
self.text = [self.text substringWithRange:NSMakeRange(0, decimalPosition)];
}
NSString *toDelete = [self.format substringWithRange:NSMakeRange(range.location, range.length)];

NSUInteger realLength = MAX(range.length - [toDelete stringByReplacingOccurrencesOfString:@"X" withString:@""].length, 1);

NSString *unformattedString = self.unformattedText;

NSString *unformattedStringToLocation = [unformattedString substringWithRange:NSMakeRange(0, realLocation+realLength)];
NSString *unformattedHead = [unformattedStringToLocation substringWithRange:NSMakeRange(0, unformattedStringToLocation.length - realLength)];
NSString *unformattedTail = [unformattedString substringWithRange:NSMakeRange(unformattedStringToLocation.length, unformattedString.length - unformattedStringToLocation.length)];

self.text = [[unformattedHead stringByAppendingString:unformattedTail] re_stringWithNumberFormat:self.format];
self.currentFormattedText = self.text;

NSUInteger location = range.location;
location -= [toDelete stringByReplacingOccurrencesOfString:@"X" withString:@""].length;
UITextPosition *start = [self positionFromPosition:[self beginningOfDocument]
offset:location];
[self setSelectedTextRange:[self textRangeFromPosition:start toPosition:start]];

//Since iOS6 the UIControlEventEditingChanged is not triggered by programmatically changing the text property of UITextField.
//
[self sendActionsForControlEvents:UIControlEventEditingChanged];
Expand All @@ -110,17 +132,17 @@ - (NSString *)unformattedText
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"\\D" options:NSRegularExpressionCaseInsensitive error:NULL];
return [regex stringByReplacingMatchesInString:self.text options:0 range:NSMakeRange(0, self.text.length) withTemplate:@""];
}
NSString *trimmedFromat = [[self.format componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"0123456789X"] invertedSet]] componentsJoinedByString:@""];
NSString *trimmedFormat = [[self.format componentsSeparatedByCharactersInSet:[[NSCharacterSet characterSetWithCharactersInString:@"0123456789X"] invertedSet]] componentsJoinedByString:@""];
NSString *trimmedText = [[self.text componentsSeparatedByCharactersInSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]] componentsJoinedByString:@""];

NSMutableString *unformattedText = [NSMutableString string];
NSUInteger length = MIN([trimmedFromat length], [trimmedText length]);
NSUInteger length = MIN([trimmedFormat length], [trimmedText length]);

for (NSUInteger i = 0; i < length; ++i) {
NSRange range = NSMakeRange(i, 1);

NSString *symbol = [trimmedText substringWithRange:range];
if (![[trimmedFromat substringWithRange:range] isEqualToString:symbol]) {
if (![[trimmedFormat substringWithRange:range] isEqualToString:symbol]) {
[unformattedText appendString:symbol];
}
}
Expand All @@ -133,8 +155,8 @@ - (NSString *)unformattedText

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if (range.length == 1 && string.length==0) {
[self deleteBackward];
if (string.length==0) {
[self deleteFromRange:range];
return NO;
}

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