iphone - UITableView分组数组

我似乎无法从逻辑上弄清楚如何为每个分组的节分别创建一个数组，该数组将在导航控制器的详细视图中显示不同的数据。对于每个组，都有不同的数据，但是第二个视图当前在其中显示一个数组中UILabel中的数据，并从每个组的数组开头开始。如果您需要更多信息，请告诉我。

- (void)viewDidLoad
{
    [super viewDidLoad];

    //Keeping of Business Names for Detailed View
    addressBook=@[@"Clinic 1 Business",@"Clinic 2 Business",@"Clinic 3 Business"];

    //holding of clinic names per county
    adams=@[@"Clinic 1 Business Listing",@"Clinic 2 Business Listing",@"eeeee"];
    allegheny=@[@"Clinic 3 Business Listing",@"Clinic 4 Business Listing"];
    armstrong=@[@"Clinic 5 Business Listing",@"Clinic 6 Business Listing",@"Clinic 7 Business Listing"];

    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;


    NSLog(@"this is the content of addressBook: \n %@", addressBook);

    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{

    // Return the number of sections.
    return 3;
}


- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

    // Return the number of rows in the section.
    //return addressBook.count;
    if(section==0)
    {
        return [adams count];
    }
    else if(section==1)
    {
        return [allegheny count];
    }
    else if (section==2)
    {
        return [armstrong count];
    }
}

/*
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView{
    return [NSArray arrayWithObjects:@"Rec", @"A", @"B", nil ];
}
*/

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"abCell";
    addressBookCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    if(indexPath.section==0)
    {
        cell.addressBookLbl.text=[adams objectAtIndex:indexPath.row];

    }
    else if(indexPath.section==1)
    {
        cell.addressBookLbl.text=[allegheny objectAtIndex:indexPath.row];
    }
    else if (indexPath.section==2)
    {
        cell.addressBookLbl.text=[armstrong objectAtIndex:indexPath.row];
    }

    return cell;
}


-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier]isEqualToString:@"addressBookDetails"]) {

        addressBookDetailsViewController *addressDetailsController = [segue destinationViewController];

        NSIndexPath *abIndexPath = [self.tableView indexPathForSelectedRow];

        int row = [abIndexPath row];

        addressDetailsController.addressDetail=@[addressBook[row]];

        NSLog(@"this is the content of addressBook: \n %@", addressBook);
    }
}

-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    if (section==0) {
        return @"Adams County";
    }
    else if(section==1)
    {
        return @"Allegheny County";
    }
    else if(section==2)
    {
        return @"Armstrong County";
    }
}

最佳答案

您传递数据的方式将是使用segue（您正在执行的操作）。您没有正确执行的操作是在prepareForSegue方法中。为了简化起见，请使用didSelectRowAtIndexPath方法，这样就不会创建自己的查找所选单元格的方式。

要解决这个问题，您必须在didSelectRowAtIndexPath中添加一些内容。这是您需要做的：

该：

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender

您拥有的方法应如下所示：

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"addressBookDetails"]) {

        addressBookDetailsViewController *addressDetailsController = [segue destinationViewController];

        addressDetailsController.addressDetail = selectedAddressBook;
       //selectedAddressBook is an array that you don't have yet, but will create in the next step
       //Make sure that the addressDetail in the DetailViewController is an Array, and not something else

    }
}

现在，您要创建数组selectedAddressBook。因此，在标题中（我们仍在MasterViewController中）：

@interface  //blah blah blah
{
    NSArray *selectedAddressBook;
}

OK，现在回到实现文件（仍然是MasterViewController）。现在，您将使用didSelectRowAtIndexPath方法（最后，我将对此重要性进行解释）。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    //some animation to fade away the blue on selection
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    //here you will populate the array that you created
    selectedAddressBook = (NSArray *)addressBook[indexPath.row];

    //now you perform your segue
    [self performSegueWithIdentifier:@"addressBookDetails" sender:self];
}

如果您尝试现在运行它，它可能会崩溃。删除现有的segue。只需删除它。在MasterViewController本身和DetailViewController之间创建一个新的序列。选择所需的任何类型，但您可能应该使用Replace segue。为该序列提供与刚刚删除的标识符相同的标识符。

现在，在DetailViewController .m文件中，放置一个NSLog来监视viewDidLoad中的数据：

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSLog(@"Did the array get passed along? Let's see :\n %@", addressDetail);
    //addressDetail should be the name of the array in this VC
}

如果一切顺利，则日志应仅显示所选行的详细信息。现在，在DetailViewController中，您可以从数组访问数据并按需要显示它。

使用tableView时需要使用didSelectRowAtIndexPath方法的原因实际上只是因为它使生活变得简单。此方法通过使用NSIndexPath识别所选的行。这消除了您在prepareForSegue方法中观看它的方式。它告诉委托人现在选择了指定的行。使用此功能，您可以有选择地对单元格点击执行操作。