How convert string in phone number format? objective c [closed]

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I want to convert string into phone number format. For example I have string in which I have value, "456897012". Now I want to convert it in phone number format like as (456)897-012. So what is process for that? How can I do that?

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Something like this should work out I guess;

NSString *unformatted = @"5129876985";
NSArray *stringComponents = [NSArray arrayWithObjects:[unformatted substringWithRange:NSMakeRange(0, 3)], 
                             [unformatted substringWithRange:NSMakeRange(3, 3)], 
                             [unformatted substringWithRange:NSMakeRange(6, [unformatted length]-6)], nil];

NSString *formattedString = [NSString stringWithFormat:@"(%@)%@-%@", [stringComponents objectAtIndex:0], [stringComponents objectAtIndex:1], [stringComponents objectAtIndex:2]];
NSLog(@"Formatted Phone Number: %@", formattedString);

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Ok

Suppose you have the oldPhone

[oldPhone insertString: @"(" atIndex: 0];

[oldPhone insertString: @")" atIndex: 4];

[oldPhone insertString: @"-" atIndex: 9];

Have not test it.

Hope that helps