How to check if NSString contains only numbers.

NSCharacterSet *_NumericOnly = [NSCharacterSet decimalDigitCharacterSet];

NSCharacterSet *myStringSet = [NSCharacterSet characterSetWithCharactersInString:mystring];

    

if ([_NumericOnly isSupersetOfSet: myStringSet])

{

    //String entirely contains decimal numbers only.

   

        

}