I am trying to detect whether a NSNumber is between 0 and 255 or not. Whenever I run the app, I receive the alert view that my number is greater than 255, even when it is not. I do not have this problem with 0.
if (redValue < 0) {
NSLog(@"Red value is less than 0");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Your number must be greater than 0." message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
} else if (redValue > 255) {
NSLog(@"Red value is greater than 255");
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Your number must be less than 255." message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}
Additionally, I receive this warning on the "else if (redValue > 255)" line: Ordered comparison between pointed and integer ('NSNumber *' and 'int'), So I'm assuming I have to convert this NSNumber to an integer?
Should be:
if([redValue intValue] < 0) {
...
if([redValue intValue] > 255) {
...
Assuming it is an int. If it isn't go to the NSNumber Class Reference look under "Accessing Numeric Values" and replace intValue
with the appropriate thing.