Phone number formatting on iOS

This will help you

Format (xxx) xxx-xxxx

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    int length = (int)[self getLength:textField.text];    //NSLog(@"Length  =  %d ",length);    if(length == 10)    {        if(range.length == 0)            return NO;    }    if(length == 3)    {        NSString *num = [self formatNumber:textField.text];        textField.text = [NSString stringWithFormat:@"(%@) ",num];        if(range.length > 0)            textField.text = [NSString stringWithFormat:@"%@",[num substringToIndex:3]];    }    else if(length == 6)    {        NSString *num = [self formatNumber:textField.text];        //NSLog(@"%@",[num  substringToIndex:3]);        //NSLog(@"%@",[num substringFromIndex:3]);        textField.text = [NSString stringWithFormat:@"(%@) %@-",[num  substringToIndex:3],[num substringFromIndex:3]];        if(range.length > 0)            textField.text = [NSString stringWithFormat:@"(%@) %@",[num substringToIndex:3],[num substringFromIndex:3]];    }    return YES;}- (NSString *)formatNumber:(NSString *)mobileNumber{    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"(" withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@")" withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@" " withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"-" withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"+" withString:@""];    NSLog(@"%@", mobileNumber);    int length = (int)[mobileNumber length];    if(length > 10)    {        mobileNumber = [mobileNumber substringFromIndex: length-10];        NSLog(@"%@", mobileNumber);    }    return mobileNumber;}- (int)getLength:(NSString *)mobileNumber{    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"(" withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@")" withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@" " withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"-" withString:@""];    mobileNumber = [mobileNumber stringByReplacingOccurrencesOfString:@"+" withString:@""];    int length = (int)[mobileNumber length];    return length;}

This felt more clear and handles removing any unwanted characters much more nicely. Formats correctly for 1 (###) ###‑#### or (###) ###‑####

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{    NSString *newString = [textField.text stringByReplacingCharactersInRange:range withString:string];    NSArray *components = [newString componentsSeparatedByCharactersInSet:[[NSCharacterSet decimalDigitCharacterSet] invertedSet]];    NSString *decimalString = [components componentsJoinedByString:@""];    NSUInteger length = decimalString.length;    BOOL hasLeadingOne = length > 0 && [decimalString characterAtIndex:0] == '1';    if (length == 0 || (length > 10 && !hasLeadingOne) || (length > 11)) {        textField.text = decimalString;        return NO;    }    NSUInteger index = 0;    NSMutableString *formattedString = [NSMutableString string];    if (hasLeadingOne) {        [formattedString appendString:@"1 "];        index += 1;    }    if (length - index > 3) {        NSString *areaCode = [decimalString substringWithRange:NSMakeRange(index, 3)];        [formattedString appendFormat:@"(%@) ",areaCode];        index += 3;    }    if (length - index > 3) {        NSString *prefix = [decimalString substringWithRange:NSMakeRange(index, 3)];        [formattedString appendFormat:@"%@-",prefix];        index += 3;    }    NSString *remainder = [decimalString substringFromIndex:index];    [formattedString appendString:remainder];    textField.text = formattedString;    return NO;}

The code bellow is what I typically use. The format is different but you get the picture. This will handle input such as '123df#$@$gdfg45-+678dfg901' and output '1 (234) 567-8901'

#import "NSString+phoneNumber.h"@implementation NSString (phoneNumber)-(NSString*) phoneNumber{    static NSCharacterSet* set = nil;    if (set == nil){        set = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];    }    NSString* phoneString = [[self componentsSeparatedByCharactersInSet:set] componentsJoinedByString:@""];    switch (phoneString.length) {        case 7: return [NSString stringWithFormat:@"%@-%@", [phoneString substringToIndex:3], [phoneString substringFromIndex:3]];        case 10: return [NSString stringWithFormat:@"(%@) %@-%@", [phoneString substringToIndex:3], [phoneString substringWithRange:NSMakeRange(3, 3)],[phoneString substringFromIndex:6]];        case 11: return [NSString stringWithFormat:@"%@ (%@) %@-%@", [phoneString substringToIndex:1], [phoneString substringWithRange:NSMakeRange(1, 3)], [phoneString substringWithRange:NSMakeRange(4, 3)], [phoneString substringFromIndex:7]];        case 12: return [NSString stringWithFormat:@"+%@ (%@) %@-%@", [phoneString substringToIndex:2], [phoneString substringWithRange:NSMakeRange(2, 3)], [phoneString substringWithRange:NSMakeRange(5, 3)], [phoneString substringFromIndex:8]];        default: return nil;    }}@end