Phone number formatting on iOS

Question

I have a text field where the user enters data. It's a phone number field. If the user enters 1234567890, I want it displayed as (123)-(456)-7890 as the user types. How is this possible?

Answer 1

You can use AKNumericFormatterlibrary for it. It has formatter and convenient UITextField category, it's available as a cocoapod.

Answer 2

So this method will format for (xxx) xxx - xxxx ....
it is a modification of the current top answer and handles backspaces

- (IBAction)autoFormat:(UITextField *)sender {

NSString *mobileNumber = [NSString stringWithFormat:@"%@",sender.text];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"(" withString:@""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@")" withString:@""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@" " withString:@""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"-" withString:@""];
mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"+" withString:@""];

int length = [mobileNumber length];
if(length > 0 && [sender.text length] > self.oldLength){
    if(length >= 7 && length <= 10){
        sender.text = [NSString stringWithFormat:@"(%@) %@ - %@",[mobileNumber substringToIndex:3], [mobileNumber substringWithRange:NSMakeRange(3,3)],[mobileNumber substringWithRange:NSMakeRange(6,[mobileNumber length]-6)]];
    } else if(length >= 4 && length <= 6) {
        sender.text = [NSString stringWithFormat:@"(%@) %@",[mobileNumber substringToIndex:3], [mobileNumber substringWithRange:NSMakeRange(3,[mobileNumber length]-3)]];
    }
    if(length >= 11 && length % 4 == 3){
        NSString *lastChar = [sender.text substringFromIndex:[sender.text length] - 1];
        sender.text = [NSString stringWithFormat:@"%@ %@",[sender.text substringToIndex:[sender.text length] - 1],lastChar];
    }
    self.oldLength = [sender.text length];
} else if([sender.text length] < self.oldLength) {
    NSLog(@"deleted - ");
    self.oldLength = 0;

    sender.text = @"";
    for (int i = 0; i < [mobileNumber length]; i = i + 1) {
        sender.text = [NSString stringWithFormat:@"%@%@",sender.text,[mobileNumber substringWithRange:NSMakeRange(i, 1)]];
        [self autoFormat:sender];
    }
}}

hope it helps

Answer 3

Here's a simple category which will mimic the format of the input

@interface NSString (formatDecimalsAs)
- (NSString *)formatDecimalsAs:(NSString *)formattedDecimals;
@end

@implementation NSString (formatDecimalsAs)
- (NSString *)formatDecimalsAs:(NSString *)formattedDecimals
{
    // insert non-digit characters from source string
    NSMutableString *formattedNumber = [self mutableCopy];
    for (int i = 0; i < formattedDecimals.length; i++)
    {
        if (i > formattedNumber.length)
        {
            break;
        }
        unichar character = [formattedDecimals characterAtIndex:i];
        if ([[NSCharacterSet decimalDigitCharacterSet].invertedSet characterIsMember:character])
        {
            [formattedNumber insertString:[NSString stringWithFormat:@"%c", character] atIndex:(NSUInteger) i];
        }
    }
    return formattedNumber;
}
@end

example use

[@"87654321" formatDecimalsAs:@"1111 1111"] // returns @"8765 4321"

Answer 4

REFormattedNumberField is probably the best. Just supply a format you wish.

Answer 5

1. Removes all non-digit characters
2. If 7 digits remain, 123-4567
3. for 10 digits, [phone]

4. Otherwise, groups of three. To adjust the size of the groups, change the value assigned to substrsize

   -(NSString*)formatPhone:(NSString*)phone {
   
        NSString *formattedNumber = [[phone componentsSeparatedByCharactersInSet:
                             [[NSCharacterSet decimalDigitCharacterSet] invertedSet]]
                            componentsJoinedByString:@""];
   
   int substrSize = 3;
   NSMutableArray *t = [[NSMutableArray alloc] initWithCapacity:formattedNumber.length / substrSize + 1];
   switch (formattedNumber.length) {
       case 7:
           formattedNumber = [NSString stringWithFormat:@"%@-%@",
                          [formattedNumber substringToIndex:3],
                          [formattedNumber substringFromIndex:3]];
       break;
   
       case 10:
           formattedNumber = [NSString stringWithFormat:@"(%@) %@-%@",
                          [formattedNumber substringToIndex:3],
                          [formattedNumber substringWithRange:NSMakeRange(3, 3)],
                          [formattedNumber substringFromIndex:6]];
       break;
   
       default:
           for (int i = 0; i < formattedNumber.length / substrSize; i++) {
           [t addObject:[formattedNumber substringWithRange:NSMakeRange(i * substrSize, substrSize)]];
           }
           if (formattedNumber.length % substrSize) {
               [t addObject:[formattedNumber substringFromIndex:(substrSize * t.count)]];
       }
           formattedNumber = [t componentsJoinedByString:@" "];
       break;
    }
    return formattedNumber;
   }