在UIViewController中填充UITableView并使用UISegmentedControl更改数据源

Question

我正在尝试填充UITableView UIViewController，UISegmentedControl位于UITableView下方@interface OTValuesViewController () @property (weak, nonatomic) IBOutlet UITableView *tableView; @property (weak, nonatomic) IBOutlet UISegmentedControl *segmentControl; @end @implementation OTValuesViewController - (IBAction)segmentValueChanged:(id)sender { UISegmentedControl *segment = self.segmentControl; UINavigationItem *navItem = self.navigationItem; UIBarButtonItem *addButton = navItem.rightBarButtonItem; switch (segment.selectedSegmentIndex) { case 0: addButton.action = @selector(addNewVision:); [self.tableView reloadData]; break; case 1: addButton.action = @selector(addNewPurpose:); [self.tableView reloadData]; break; case 2: addButton.action = @selector(addNewPlan:); [self.tableView reloadData]; break; default: [self.tableView reloadData]; break; } } -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UISegmentedControl *segment = self.segmentControl; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"OTValuesTableViewCell" forIndexPath:indexPath]; NSArray *visions = [[OTVisionStore sharedStore] allVisions]; NSArray *purposes = [[OTPurposeStore sharedStore] allPurposes]; NSArray *plans = [[OTPlanStore sharedStore]allPlans]; OTVision *vision = [visions objectAtIndex:indexPath.row]; OTVision *purpose = [purposes objectAtIndex:indexPath.row]; OTVision *plan = [plans objectAtIndex:indexPath.row]; NSString *textLabel = [vision description]; if (segment.selectedSegmentIndex==0) { textLabel = [vision description]; cell.textLabel.text = textLabel; } else if (segment.selectedSegmentIndex==1) { textLabel = [purpose description]; cell.textLabel.text = textLabel; } else{ textLabel = [plan description]; cell.textLabel.text = textLabel; } return cell; } -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { UISegmentedControl *segment = self.segmentControl; if(segment.selectedSegmentIndex==0) { return [[[OTVisionStore sharedStore]allVisions]count]; } else if (segment.selectedSegmentIndex==1) { return [[[OTPurposeStore sharedStore]allPurposes]count]; } else{ return [[[OTPlanStore sharedStore]allPlans]count]; } } - (void)viewDidLoad { [super viewDidLoad]; self.tableView.dataSource = self; self.tableView.delegate = self; self.title=@"Mission Statement"; UINavigationItem *navItem = self.navigationItem; UIBarButtonItem *rbbi = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addNewVision:)]; navItem.rightBarButtonItem = rbbi; } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; [self.tableView reloadData]; } 下方，如图所示：

按下任何一个段后，我希望UISegmentedControl重新填充一组不同的数据。这是我的相关代码：

self.tableView.dataSource = self;
self.tableView.delegate = self;

我的问题是：当我构建并运行项目时，一切都很好 - 单元格填充在我的默认选项卡（视觉）中。当我点击viewDidLoad按钮时，出现错误：

  

由于未捕获的异常'NSRangeException'而终止应用程序，原因：'*** - [__ NSArrayM objectAtIndex：]：索引1超出边界[0 .. 0]'

如果我删除：

UITableView

来自我的UISegmentedController's，此错误不会发生（但{{1}}显然没有填充。）这让我相信错误来自于我填充基于的单元格但是，{{1}}选定的细分受众群，我不知道具体是什么造成的。

非常感谢任何帮助！

Answer 1

问题出在您的cellForRowAtIndexPath方法中。您尝试为所有阵列使用当前索引路径，而不仅仅是适用的阵列。尝试这样的事情：

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UISegmentedControl *segment = self.segmentControl;
    UITableViewCell *cell = [tableView     dequeueReusableCellWithIdentifier:@"OTValuesTableViewCell" forIndexPath:indexPath];

    if (segment.selectedSegmentIndex==0) {
        NSArray *visions = [[OTVisionStore sharedStore] allVisions];
        OTVision *vision = [visions objectAtIndex:indexPath.row];
        NSString *textLabel = [vision description];
        cell.textLabel.text = textLabel;
    }
    else if (segment.selectedSegmentIndex==1) {
        NSArray *purposes = [[OTPurposeStore sharedStore] allPurposes];
        OTVision *purpose = [purposes objectAtIndex:indexPath.row];
        NSString *textLabel = [purpose description];
        cell.textLabel.text = textLabel;
    }
    else{
        NSArray *plans = [[OTPlanStore sharedStore]allPlans];
        OTVision *plan = [plans objectAtIndex:indexPath.row];
        NSString *textLabel = [plan description];
        cell.textLabel.text = textLabel;
    }

    return cell;
}