frankus

/**
 Returns the index paths of the rows affected by switching between two
 sorted (but not necessarily unique) arrays. 
 
 @param old The array to be switched from.
 @param new The array to be switched to.
 @param keyPath the key path to compare ("@self" to use raw value)
 
 @return An array of three arrays, the first containing index paths
 for modified rows, the second for deleted rows, and the third for

frankus

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
    if (textField == self.myPhoneTextField) {
        NSString *newText = [textField.text stringByReplacingCharactersInRange:range withString:string];
        BOOL deleting = [newText length] < [textField.text length];
        
        NSString *stripppedNumber = [newText stringByReplacingOccurrencesOfString:@"[^0-9]" withString:@"" options:NSRegularExpressionSearch range:NSMakeRange(0, [newText length])];
        NSUInteger digits = [stripppedNumber length];
        
        if (digits > 10)
            stripppedNumber = [stripppedNumber substringToIndex:10];