NSTextCheckingResult for phone numbers - iphone

Question

Can someone tell me why this evaluates every time to true?!
The input is: jkhkjhkj. It doesn't matter what I type into the phone field. It's every time true...
NSRange range = NSMakeRange (0, [phone length]);
NSTextCheckingResult *match = [NSTextCheckingResult phoneNumberCheckingResultWithRange:range phoneNumber:phone];
if ([match resultType] == NSTextCheckingTypePhoneNumber)
{
return YES;
}
else
{
return NO;
}
Here is the value of match:
(NSTextCheckingResult *) $4 = 0x0ab3ba30 <NSPhoneNumberCheckingResult: 0xab3ba30>{0, 8}{jkhkjhkj}
I was using RegEx and NSPredicate but I've read that since iOS4 it's recommended to use NSTextCheckingResult but I can't find any good tutorials or examples on this.
Thanks in advance!

Answer 1

You are using the class incorrectly. NSTextCheckingResult is the result of a text checking that is done by NSDataDetector or NSRegularExpression. Use NSDataDetector instead:
NSError *error = NULL;
NSDataDetector *detector = [NSDataDetector dataDetectorWithTypes:NSTextCheckingTypePhoneNumber error:&error];
NSRange inputRange = NSMakeRange(0, [phone length]);
NSArray *matches = [detector matchesInString:phone options:0 range:inputRange];
// no match at all
if ([matches count] == 0) {
return NO;
}
// found match but we need to check if it matched the whole string
NSTextCheckingResult *result = (NSTextCheckingResult *)[matches objectAtIndex:0];
if ([result resultType] == NSTextCheckingTypePhoneNumber && result.range.location == inputRange.location && result.range.length == inputRange.length) {
// it matched the whole string
return YES;
}
else {
// it only matched partial string
return NO;
}