iOS中的UIPickerView内的UITableView

caratFromPicker = [[UIPickerView alloc] init];
    caratTable = [[UITableView alloc]initWithFrame:caratFromPicker.frame style:UITableViewStylePlain];
    caratTable.delegate = self;
    caratTable.datasource = self;
    caratTable.bounces = YES;

    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithtitle:@"Done" style:UIBarButtonItemStyleDone target:self action:@SELEctor(donE)];
    UIToolbar *toolBar = [[UIToolbar alloc]initWithFrame:CGRectMake(0,self.view.frame.size.height-caratFromPicker.frame.size.height-50,self.view.frame.size.width,50)];
    [toolBar setBarStyle:UIBarStyleBlackOpaque];
    NSArray *toolbarItems = [NSArray arrayWithObjects:doneButton,nil];
    [toolBar setItems:toolbarItems];
    price1.inputView = caratFromPicker;
    price1.inputAccessoryView = toolBar;
    [caratFromPicker setDatasource: self];
    [caratFromPicker setDelegate: self];
    caratFromPicker.showsSelectionInDicator = YES;//loadFromPicker
    [caratFromPicker addSubview:caratTable];

并将uITableView委托实现为：

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
     return [caratFromArray count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowATindexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    //UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reusEIDentifier:CellIdentifier];
    }

    tableView.separatorStyle = UITableViewCellSeparatorStyleNone;

    cell.textLabel.text = [caratFromArray objectATindex:indexPath.row];

    return cell;
}

这是相同的截图：

但我的问题是我无法滚动tableview来查看下一个值.