UITextFieldで変換を完了せずに、テキストフィールド内の文字を取得

textfield.m

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

//    NSLog(@"change");
    NSMutableString *tmpStr = [NSMutableString stringWithString:textField.text];
    [self.view addSubview:self.resultTableView];
    
    if ([string isEqualToString:@""]){//delete押された時
        if ([textField.text length] == 1) {
            
            [self.resultTableView removeFromSuperview];
        }else{
            
            [tmpStr deleteCharactersInRange:NSMakeRange(tmpStr.length-1, 1)];
            tmpStr = [self stringTransformWithTransform:kCFStringTransformLatinHiragana reverse:NO string:tmpStr];
//            NSLog(@"search : %@", tmpStr);
            [self.resultTableView filterContentForSearchText:tmpStr];
            [self.resultTableView reloadData];
        }
        return YES;
    }else if (string.length > 1){//予測変換が押された時
        
//        NSLog(@"yosoku : %@", string);
        [self.resultTableView filterContentForSearchText:string];
        [self.resultTableView reloadData];
        return YES;
    }else{                      //入力時
        
        [tmpStr appendString:string];
        tmpStr = [self stringTransformWithTransform:kCFStringTransformLatinHiragana reverse:NO string:tmpStr];
//        NSLog(@"search : %@", tmpStr);
        [self.resultTableView filterContentForSearchText:tmpStr];
        [self.resultTableView reloadData];
    }
    return YES;
}

- (NSMutableString*) stringTransformWithTransform:(CFStringRef)transform reverse:(Boolean)reverse string:(NSMutableString *)string {
    NSMutableString* retStr = [[NSMutableString alloc] initWithString:string];
    CFStringTransform((CFMutableStringRef)retStr, NULL, transform, reverse);
    return retStr;
}