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];