Question

I have a calculator app in which I have a textfield in which if I enter any number; then it works fine. If I do not enter a number then it shows alert. I also want the user to be able to enter 1.5 but when I do this it shows alert “enter a number please”

So how can I enter decimal number? I am using the following code :

   NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789"] invertedSet];


  NSString*string=costToClientTextField.text;

 if ([string rangeOfCharacterFromSet:set].location != NSNotFound) {


 UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Warning" message:@"Only a number can be entered into this input field " delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
 [alert show];
 [alert release];


 costToClientTextField.text=@"";


  }

Answer 1

Add the “.” in your set, like so

  NSCharacterSet * set = [[NSCharacterSet characterSetWithCharactersInString:@"0123456789."] invertedSet];