NSString is integer?

Question

How to check if the content of a NSString is an integer value? Is there any readily available way?

There got to be some better way then doing something like this:

- (BOOL)isInteger:(NSString *)toCheck {
  if([toCheck intValue] != 0) {
    return true;
  } else if([toCheck isEqualToString:@"0"]) {
    return true;
  } else {
    return false;
  }
}

Answer 1

You could use the -intValue or -integerValue methods. Returns zero if the string doesn't start with an integer which is a bit of a shame as zero is a valid value for an integer...

A better option might be to use [NSScanner scanInt:] which returns a BOOL indicating whether or not it found a suitable value.

Answer 2

Something like this:

NSScanner* scan = [NSScanner scannerWithString:toCheck]; 
int val; 
return [scan scanInt:&val] && [scan isAtEnd];