在表视图之间传递数据 [英] Passing data between table views

查看：78 发布时间：2017/1/10 22:22:09 ios objective-c uitableview core-data uisearchbar

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问题描述

我有一个问题，我创建了一个 UITableView 使用 CoreData code> UITableView 到 DetailView 的行）我使用这个方法：

   - （void）prepareForSegue：（UIStoryboardSegue *）segue sender：（id）sender 
 {
 if（[[segue identifier] isEqualToString：@UpdateData]）{
 NSManagedObject * selectedDevice = [self.datas objectAtIndex：
 [[self.tableView indexPathForSelectedRow] row]]; 
 DetailViewController * destViewController = segue.destinationViewController; 
 destViewController.datas = selectedDevice; 
 
} 
}

但后来我添加了一个 UISearchBar ，不能使用 NSManagedObject ，所以我创建了另一个NSMutableArray 其中我保存了所有 NSStrings 组成 cell.textLabel.text ，它工作。但是现在，我需要修改 prepareForSegue ，以便在从SearchBar tableView中选择一行时执行 segue 。

问题是要执行这种 segue 与 CoreData 我需要使用 NSManagedObject ，所以我的问题是：我如何获得 indexPath.row 里面的 UISearchBar 里面，使它对应于正确的 indexPath.row of my self.data （这是我用来执行正常 segue 在 UITableView ，看代码）？我想我可以比较单元格的字符串（cell.textLabel.text），但

 
 不知道如何

 <>> 我添加了UISearchBar从故事板，这是我用来过滤主表视图的代码：
 
   - （void）filterContentForSearchText：（NSString *）searchText scope：（NSString *）scope 
 {
 [_searchDati removeAllObjects]; 
 NSPredicate * resultPredicate = [NSPredicate predicateWithFormat：@SELF contains [cd]％@，searchText]; 
 _searchDati = [NSMutableArray arrayWithArray：[_ tableData filteredArrayUsingPredicate：resultPredicate]]; 
} 
 
  - （BOOL）searchDisplayController：（UISearchDisplayController *）controller 
 shouldReloadTableForSearchString：（NSString *）searchString 
 {
 [self filterContentForSearchText：searchString 
 scope：[[self.searchDisplayController.searchBar scopeButtonTitles] 
 objectAtIndex：[self.searchDisplayController.searchBar 
 selectedScopeButtonIndex]]]; 
 
 return YES; 
} 
  
其中 _searchDati 为UISearchBar和 _tableData 创建的数组i是为存储来自包含CoreDatas的NSManagedObject的单元格名称而创建的数组。
 
 
 我也添加了这个
   - （void）searchDisplayController：（UISearchDisplayController *）controller didLoadSearchResultsTableView :( UITableView *）tableView 
 {
 [tableView registerClass：[UITableViewCell class] forCellReuseIdentifier：@Cell]; 
} 
 
 //在searchBar上处理选择
  - （void）tableView：（UITableView *）tableView didSelectRowAtIndexPath：（NSIndexPath *）indexPath 
 {
 if（tableView == self.searchDisplayController.searchResultsTableView）{
 [self performSegueWithIdentifier：@UpdateDatasender：self]; 
} 
} 
  
 
 
第一个因为我使用这个，我需要注册该类或给我一个错误
  static NSString * CellIdentifier = @Cell; 
 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier：CellIdentifier forIndexPath：indexPath]; 
  
，第二个用于处理UISearchBarTableView的选择。
 
 
 在这里我加载tableView如前所述
   - （UITableViewCell *）tableView：（UITableView * ）tableView cellForRowAtIndexPath：（NSIndexPath *）indexPath 
 {
 static NSString * CellIdentifier = @Cell; 
 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier：CellIdentifier forIndexPath：indexPath]; 
 
 
 if（tableView == self.searchDisplayController.searchResultsTableView）{
 //查看过滤器方法
 cell.textLabel.text = [_searchDati objectAtIndex：indexPath.row ]; 
 
} else {
 NSString * string; 
 NSManagedObject * data = [self.datas objectAtIndex：indexPath.row]; 
 string = [NSString stringWithFormat：@％@，[data valueForKey：@name]]; 
 [cell.detailTextLabel setText：nil]; 
 cell.textLabel.text = string; 
 
 //将字符串存储到tableView数组
 [_tableData addObject：string]; 
} 
 
 return cell; 
} 
  
  EDIT＃2： b 
 $ b 
我编写此代码
 
 
  NSIndexPath * indexPath = nil; 
 NSIndexPath * indexPath2 = nil; 
  if（[self.searchDisplayController isActive]）{
 
 indexPath = [self.searchDisplayController.searchResultsTableView indexPathForSelectedRow]; 
 
 for（int i = 0; i <_tableData.count; i ++）{
 if（[self.searchDati [indexPath.row] isEqualToString：_tableData [i]]）{
 indexPath2 = [NSIndexPath indexPathForRow：i inSection：1]; 
} 
} 
 NSManagedObject * selectedDevice = [self.datas objectAtIndex：indexPath2.row]; 
 destViewController.datas = selectedDevice; 
  
当我点击UISearchBar上的一行，它只是第一次工作！我进行搜索，点击行，它到右边的DetailView，但如果我再做它崩溃给我这个错误
 由于未捕获的异常NSRangeException而终止应用程序，原因：'***  -  [__ NSArrayM objectAtIndex：]：index 5超出范围[0 .. 4]'
  pre> 
 
 我认为问题是，不从indexPath.row == 0开始，但在第一次创建一堆桩。 
任何建议？提前感谢：）
解决方案
尝试此操作：
   - （void）prepareForSegue：（UIStoryboardSegue *）segue sender：（id）sender 
 {
 if（[[segue identifier] isEqualToString：@UpdateData]）{
 NSIndexPath * indexPath = [self.tableView indexPathForCell：sender]; 
 NSManagedObject * selectedDevice = [self.datas objectAtIndex：indexPath.row]; 
 DetailViewController * destViewController = [segue destinationViewController]; 
 destViewController.datas = selectedDevice; 
 
} 
} 
  
 
I've got a problem, I created a UITableView using CoreData to pass data between the views (UITableView to DetailView of a row) I used this method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"UpdateData"]) {
        NSManagedObject *selectedDevice = [self.datas objectAtIndex:
                                 [[self.tableView indexPathForSelectedRow] row]];
        DetailViewController *destViewController = segue.destinationViewController;
        destViewController.datas = selectedDevice;

     }
}
and everything works fine. But later I added a UISearchBar that didn't work with NSManagedObject so i created another NSMutableArray where I saved all the NSStrings composing the cell.textLabel.textand it works. But now I need to modify the prepareForSegue in order to perform a segue whenever I select a row from the SearchBar tableView.

The problem is that to perform this kind of segue connecting with the CoreData I need to use the NSManagedObject, so my question is:
How can i get the indexPath.row from the UISearchBar inside my UITableView and make it correspond to the right indexPath.row of my self.data (that is the array I used to perform the normal segue in the UITableView, see code) ? 
I thought I could compare the strings of the cell (cell.textLabel.text) but 

don't know how to do.
there could be a problem if there are 2 rows with same name I suppose.
any advice?

EDIT: I added the UISearchBar from the storyboard and this is the code i use to filter the main table view:
- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{
    [_searchDati removeAllObjects];
    NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"SELF contains[cd] %@", searchText];
    _searchDati = [NSMutableArray arrayWithArray:[_tableData filteredArrayUsingPredicate:resultPredicate]];
}

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller
shouldReloadTableForSearchString:(NSString *)searchString
{
    [self filterContentForSearchText:searchString
                               scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
                                      objectAtIndex:[self.searchDisplayController.searchBar
                                                     selectedScopeButtonIndex]]];

    return YES;
}
Where _searchDati is the array i created for the UISearchBar and _tableData is the array i created to store the name of the cells from the NSManagedObject that contains the CoreDatas.

and i also added this
- (void)searchDisplayController:(UISearchDisplayController *)controller didLoadSearchResultsTableView:(UITableView *)tableView
{
    [tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];
}

//Handle selection on searchBar
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (tableView == self.searchDisplayController.searchResultsTableView) {
        [self performSegueWithIdentifier: @"UpdateData" sender: self];
    }
}
The first because i used this and i need to register the class or gave me an error
static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
and the second one to handle the selection of the UISearchBarTableView.

In here i load the tableView as i said before
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];


    if (tableView == self.searchDisplayController.searchResultsTableView) {
       // see filter method
        cell.textLabel.text = [_searchDati objectAtIndex:indexPath.row];

    } else {
        NSString *string;
        NSManagedObject *data = [self.datas objectAtIndex:indexPath.row];
        string = [NSString stringWithFormat:@"%@", [data valueForKey:@"name"]];
        [cell.detailTextLabel setText:nil];
        cell.textLabel.text = string;

        //store the string to the tableView array
        [_tableData addObject:string];
    }

    return cell;
}
EDIT#2:

i Wrote this code

NSIndexPath *indexPath = nil;
    NSIndexPath *indexPath2 = nil;
if ([self.searchDisplayController isActive]) {

    indexPath = [self.searchDisplayController.searchResultsTableView indexPathForSelectedRow];

    for(int i = 0 ; i < _tableData.count ; i++){
        if([self.searchDati[indexPath.row] isEqualToString:_tableData[i]]){
            indexPath2 = [NSIndexPath indexPathForRow:i inSection:1];
        }
    }
    NSManagedObject *selectedDevice = [self.datas objectAtIndex:indexPath2.row];
    destViewController.datas = selectedDevice;
when i click on a row on the UISearchBar and it WORKS only for the first time! I make the search and click on the row and it goes to the right DetailView, but if i do it again it crashes giving me this error
Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayM objectAtIndex:]: index 5 beyond bounds [0 .. 4]'
i think the problem is that does not start from the indexPath.row == 0 but create a sort of pile after the first time.
Any suggestion? Thanks in advance :)
 解决方案 
Try this,
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([[segue identifier] isEqualToString:@"UpdateData"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
NSManagedObject *selectedDevice = [self.datas objectAtIndex:indexPath.row];
        DetailViewController * destViewController = [segue destinationViewController];
destViewController.datas = selectedDevice;

     }
}


                        
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