iOS/objective-c: Function to strip characters from phone number - objective-c

Question

I created the following method to strip characters from a phone number but calling it is triggering error "use of undeclared identifier". Can anyone see what I am doing wrong? Do I have to put a reference to this in .h file? Or why won't it work.
-(id)stripTel:(NSString*) phoneno {
NSString *condensedPhoneno = [[phoneno componentsSeparatedByCharactersInSet:
[[NSCharacterSet characterSetWithCharactersInString:#"+0123456789"]
invertedSet]]
componentsJoinedByString:#""];
return condensedPhoneno;
}
-otherFunction {
NSString *oldnum = #"2334332(21)33-)";
NSString *newnum = stripTel:oldnum;
NSLog(#"newnum%#",newnum);
}

Answer 1

You need to call:
NSString *newnum = [self stripTel:oldnum];
and I can see one more mistake, should be:
- (void) otherFunction {

Answer 2

Use below code to trim the extra characters from your textfield
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
if(textField == _txtFld_MobileNo )
{
if (range.length == 1)
{
// Delete button was hit.. so tell the method to delete the last char.
_txtFld_MobileNo.text = [self formatPhoneNumber:totalString deleteLastChar:YES];
}
else
{
_txtFld_MobileNo.text = [self formatPhoneNumber:totalString deleteLastChar:NO ];
}
return false;
}
-(NSString*) formatPhoneNumber:(NSString*) simpleNumber deleteLastChar:(BOOL)deleteLastChar
{
if(simpleNumber.length==0) return #"";
// use regex to remove non-digits(including spaces) so we are left with just the numbers
NSError *error = NULL;
NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:#"[\\s-\\(\\)]" options:NSRegularExpressionCaseInsensitive error:&error];
simpleNumber = [regex stringByReplacingMatchesInString:simpleNumber options:0 range:NSMakeRange(0, [simpleNumber length]) withTemplate:#""];
// check if the number is to long
if(simpleNumber.length>10)
{
// remove last extra chars.
simpleNumber = [simpleNumber substringToIndex:10];
}
if(deleteLastChar)
{
// should we delete the last digit?
simpleNumber = [simpleNumber substringToIndex:[simpleNumber length] - 1];
}
// 123 456 7890
// format the number.. if it's less then 7 digits.. then use this regex.
if(simpleNumber.length<7)
simpleNumber = [simpleNumber stringByReplacingOccurrencesOfString:#"(\\d{3})(\\d+)"
withString:#"($1) $2"
options:NSRegularExpressionSearch
range:NSMakeRange(0, [simpleNumber length])];
else // else do this one..
simpleNumber = [simpleNumber stringByReplacingOccurrencesOfString:#"(\\d{3})(\\d{3})(\\d+)"
withString:#"($1) $2-$3"
options:NSRegularExpressionSearch
range:NSMakeRange(0, [simpleNumber length])];
return simpleNumber;
}