CODEWITHSUNDEEP
iosobjective-cformat
Rani
Rani

Reputation: 3453

How to add hyphen after every 4th character to a string in iOS

I using card.io for scanning my credit/debit card. When the scan is completed I receive string like '3456789023456789'. I am setting this string value to my textfield. Now I want that when setting the string value to textfield it should appear in this format '3456-7890-2345-6789'.

Upvotes: 0

Views: 1428

Answers (4)

Salman Zaidi
Salman Zaidi

Reputation: 9842

You can use following code to insert hiphen(-) after every forth character:

NSMutableString *requiredString = [[NSMutableString alloc] init];
for(int i = 0; i < string.length; i = i+4) {
    NSString *subString = [string substringWithRange:NSMakeRange(i, 4)];
    if(i+4 < string.length) {
        [requiredString appendString:[NSString stringWithFormat:@"%@-", subString]];
    }
    else {
        [requiredString appendString:[NSString stringWithFormat:@"%@", subString]];
        break;
    }
}

Upvotes: 1

Gabriel
Gabriel

Reputation: 3359

for( NSInteger i = 3 ; i < aMutableString.length ; i += 4  ) {
    [aMutableString insertString:@"-" atIndex: i + i/4 ] ;
}

Upvotes: 0

nmh
nmh

Reputation: 2503

NSMutableString *str = [[NSMutableString alloc] initWithString:@"3456789023456789"];
int four = 4;
for(int i = 0; i < 3 ; i++){
    [str insertString:@"-" atIndex:(i==0 ? four : four*(i+1)+i )];
}

Upvotes: 1

Ganesh Somani
Ganesh Somani

Reputation: 2360

You should have a NSMutableString and use the function 

- (void)insertString:(NSString *)aString atIndex:(NSUInteger)loc;

example [myMutableString insertString:@"-" atIndex:multiplesOfFour]

Upvotes: 2

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