NSString is empty

Question

How do you test if an NSString is empty? or all whitespace or nil? with a single method call?

Answer 1

You can try something like this:

- (BOOL) isEmptyString:(NSString *) string {
    if([string length] == 0) { //string is empty or nil
        return YES;
    } else if([[string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length] == 0) {
      //string is all whitespace
        return YES;
    }
    return NO;
 }

Check out the NSString reference on ADC.