Restrict NSTextField input to numeric only? NSNumberformatter

Question

I\'m just getting started up with Mac App Development and so far everything is good well, I\'m just having problems trying to get a NSTextField to only accept numbers for th

Answer 1

NPAssoc's Answer did help me and I did a little change to the code which did not use isMatchedByRegex function.

// Make sure the user has typed a valid number so far.
- (void)controlTextDidChange:(NSNotification *)obj
{
    if (obj.object == self->number)
    {
        NSString *countValue = number.stringValue;        
        if ([countValue length] > 0) {
            if ([[countValue substringFromIndex:[countValue length]-1] integerValue] > 0 ||
                [[countValue substringFromIndex:[countValue length]-1] isEqualToString:@"0"])
            {
                self.lastNumber = number.stringValue;
            }
            else
            {
                number.stringValue = self.lastNumber;
                NSBeep();
            }
        }
    }
}

PS:Use the [self setIntValue:[self intValue]] limited the length of the input.