Check that a input to UITextField is numeric only

by

You can do it in a few lines like this: 

BOOL valid;
NSCharacterSet *alphaNums = [NSCharacterSet decimalDigitCharacterSet];
NSCharacterSet *inStringSet = [NSCharacterSet characterSetWithCharactersInString:myInputField.text];
valid = [alphaNums isSupersetOfSet:inStringSet];    
if (!valid) // Not numeric

— this is for validating input is numeric chars only. Look at the documentation for NSCharacterSet for the other options. You can use characterSetWithCharactersInString to specify any set of valid input characters.

More Related Contents:

  1. How to convert an NSString to id or UIView objective-c iphone [closed]
  2. Converting a string to an NSDate
  3. Super slow lag/delay on initial keyboard animation of UITextField
  4. If “a == b” is false when comparing two NSString objects
  5. How to get substring of NSString?
  6. UITextField subview of UITableViewCell, get indexPath of cell
  7. +[NSString stringWithString:] — what’s the point?
  8. Password validation in UITextField in iOS
  9. How do I add 1 day to an NSDate?
  10. File write with [NSBundle mainBundle] fails
  11. How to add percent sign to NSString
  12. Set the maximum character length of a UITextField
  13. How do I parse JSON with Objective-C?
  14. setValue:forUndefinedKey: this class is not key value coding-compliant for the key [duplicate]
  15. Managing multiple asynchronous NSURLConnection connections
  16. Phone number formatting on iOS
  17. Supporting Open In… menu item in my app for iOS Mail And Safari
  18. iOS – Merging two images of different size
  19. What does @synchronized() do as a singleton method in objective C?
  20. Weak NSString variable is not nil after setting the only strong reference to nil
  21. Split an NSString to access one particular piece
  22. NSString: isEqual vs. isEqualToString
  23. How can I have a UIBarButtonItem with both image and text?
  24. Replace all NSNull objects in an NSDictionary
  25. RootViewController Switch Transition Animation
  26. Custom nav bar styling – iOS [duplicate]
  27. Is there a way to remove the separator line from a UITableView?
  28. Property ” not found on object of type ‘id’
  29. Objective C: How to create a multi-line UITextField? [duplicate]
  30. Class method equivalent of -respondsToSelector:

Leave a Comment