目标 c didSelectRowIndexPath - 将数据传递到其他视图控制器-解网

问：

嗨，我正在尝试将数据从我的TableViewController_My_boards传递到ViewController_Update_Boards但我不确定该怎么做所以首先我用来自 firestore 的数据创建一个字典

- (void)viewDidLoad {
    [super viewDidLoad];
    
    // Uncomment the following line to preserve selection between presentations.
    // self.clearsSelectionOnViewWillAppear = NO;
    
    // Uncomment the following line to display an Edit button in the navigation bar for this view controller.
    // self.navigationItem.rightBarButtonItem = self.editButtonItem;
    _db = [FIRFirestore firestore];
    
    objNSDictinoaryListOfBoards =[[NSMutableDictionary alloc]initWithCapacity:5];
    [[self.db collectionWithPath:@"boards"]
        getDocumentsWithCompletion:^(FIRQuerySnapshot * _Nullable snapshot,
                                     NSError * _Nullable error) {
          if (error != nil) {
            NSLog(@"Error getting documents: %@", error);
          } else {
            for (FIRDocumentSnapshot *document in snapshot.documents) {
                NSString *key = document.documentID;
                NSDictionary *boardDetails = document.data;
                [self->objNSDictinoaryListOfBoards setObject:boardDetails forKey:key];
                
                //NSLog(@"%@ => %@", document.documentID, document.data);

            }
              NSLog(@"self->objNSDictionaryListOfBoards= %@", self->objNSDictinoaryListOfBoards);
              [self.tableView reloadData];

          }
        }];}

之后，我在表视图单元格中显示每个项目的名称

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"SimpleIdentifier1" forIndexPath:indexPath];
   
   // Configure the cell...
   NSString *boardNo =[objNSDictinoaryListOfBoards allKeys][indexPath.row];
   NSString *boardName =objNSDictinoaryListOfBoards [boardNo][@"name"];

   cell.textLabel.text=boardName;
   return cell;
}

然后，当我单击带有didSelectRowIndexPath的单元格时，我想将数据传递给下一个viewcontroller 这就是我所拥有的，但我从这里迷失了。



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    UIStoryboard *sb=[UIStoryboard storyboardWithName:@"Main" bundle:nil];
    UIViewController *vc=[sb instantiateViewControllerWithIdentifier:@"ViewController_Update_Boards"];
    vc.modalTransitionStyle= UIModalTransitionStyleFlipHorizontal;
    //[self presentViewController:vc animated:YES completion:NULL];
    [self.navigationController pushViewController:vc animated:TRUE];
}

提前致谢

Objective-C UITableView UIViewController

UIViewController *vc=[sb instantiateViewControllerWithIdentifier:@"ViewController_Update_Boards"];，在这里，你知道它的类吧？所以投射它：你有在该方法中，您知道如何检索然后，或任何其他您想要的属性。现在，这里不能保证顺序。您应该使用 NSArray 而不是 NSDictionary 作为数据源。vcMyViewController *vc = (MyViewController *)[sb instatiante...];indexPathboardNovc.boardNo = boardNo[objNSDictinoaryListOfBoards allKeys]

0赞 Juan 12/8/2021

谢谢你这么快回答。我不明白我应该怎么做，我对目标 c 很陌生。我不确定如何取回板否

0赞 Ptit Xav 12/8/2021

@Juan ：与在 cellForRow 中执行的操作相同

0赞 Juan 12/8/2021

@Ptit Xav 谢谢我正在尝试这样做，但我在“UIViewController *”类型的对象上找不到属性“boardName”。- （void）tableView：（UITableView *）tableView didSelectRowAtIndexPath：（NSIndexPath *）indexPath{ UIStoryboard *sb=[UIStoryboard storyboardWithName：@“Main” bundle：nil];UIViewController *vc = （UIViewController *）[sb instantiateViewControllerWithIdentifier：@“ViewController_Update_Boards”];NSString *boardNo =[objNSDictinoaryListOfBoards allKeys][indexPath.row];NSString *boardName =objNSDictinoaryListOfBoards [boardNo][@“name”];vc.boardName=板名;

0赞 Ptit Xav 12/8/2021

您需要将 vac return 从 storyboard 强制转换为正确的视图控制器类（您已使用所需接口定义的类）

答：

0赞 DonMag 12/9/2021 #1

假设 Storyboard 中视图控制器的自定义类已设置为，并且该控制器的头文件如下所示：ViewController_Update_Boards

@interface ViewController_Update_Boards: UIViewController

@property (strong, nonatomic) NSString *boardName;

@end

确保您的班级在顶部有以下内容：TableViewController_My_boards

#import "ViewController_Update_Boards"

然后将方法更改为：didSelectRowAtIndexPath

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    
    UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
    ViewController_Update_Boards *vc = (ViewController_Update_Boards *)[sb instantiateViewControllerWithIdentifier:@"ViewController_Update_Boards"];
    NSString *boardNo =[objNSDictinoaryListOfBoards allKeys][indexPath.row];
    vc.boardName = objNSDictinoaryListOfBoards[boardNo][@"name"];
    [self.navigationController pushViewController:vc animated:TRUE];

}

目标 c didSelectRowIndexPath - 将数据传递到其他视图控制器

Objective c didSelectRowIndexPath - Passing data to other View Controller

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