title: How to make textfield accept decimal inputs in iphone
body: <p>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"</p>
  
  <p>So how can I enter decimal number? I am using the following code :</p>
  
  <pre><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=@"";
  
  
    }
  </code></pre>