ios - 在 View Controller 之间传递数据 DidSelectRowsAtIndexPath Storyboard

Question

在一个简单的测试应用程序中，我尝试将名为“thisArray”的数组对象从 MasterViewController 传递到 DetailViewController 中名为“passedData”的字符串。我正在使用 Storyboard ，并且 UIViewController 嵌入在导航 Controller 中。使用 prepareForSegue 方法，我成功地在 UIViewController 之间传递了数据:

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"pushData"]) {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        DetailViewController *destViewController = segue.destinationViewController;
        destViewController.passedData = [thisArray objectAtIndex:indexPath.row];
    }
}

现在出于某些原因，我想使用 didSelectRowsAtIndexPath 而不是 prepareForSegue。我用过这个:

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSMutableString *object = thisArray[indexPath.row];
    detailViewController.passedData = object;   
}

但是没有用。我使用了以下内容:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
     detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController" bundle:nil];

    NSMutableString *object = thisArray[indexPath.row];
    detailViewController.passedData = object;
    [self.navigationController pushViewController:detailViewController animated:YES];  
}

但它也没有用。

问题:

1)如何正确编写didSelectRowsAtIndexPath来替换prepareForSegue？

2) 如果我使用 didSelectRowsAtIndexPath，我是否需要删除 Storyboard 中 UIViewController 之间的 segue 连接？

3) 如果 View Controller 之间真的没有 segue 连接怎么办，我如何仍然使用 didSelectRowAtIndexPath 在它们之间传递数据？

谢谢!

更新:根据我收到的回答和评论，我写了以下内容:

首先我移除了 Controller 之间的segue连接，设置StoryBoard id DetailViewController，类名也是DetailViewController。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIStoryboard*  sb = [UIStoryboard storyboardWithName:@"DetailViewController"
                                                  bundle:nil];
    UIViewController* vc = [sb instantiateViewControllerWithIdentifier:@"DetailViewController"];

    NSMutableString *object = thisArray[indexPath.row];
    detailViewController.passedData = object;
    [self.navigationController pushViewController:detailViewController animated:YES];
}

但它因以下错误而崩溃:

*** Terminating app due to uncaught exception NSInvalidArgumentException, reason: 'Could not find a storyboard named DetailViewController in bundle

Answer 1

您的第二次尝试几乎是正确的。唯一不太正确的是从 Storyboard 中实例化 View Controller 的方式:您使用 initWithNibNamed:，这是用于 NIB 而不是 Storyboard 中的方法。对于 Storyboard，您需要:

UIStoryboard*  sb = [UIStoryboard storyboardWithName:@"theStoryboardId"
                                          bundle:nil];
// If this code is inside a method called by a controller that is itself instantiated
// from a storyboard, you can replace the above line with this.storyboard
UIViewController* detailViewController = [sb instantiateViewControllerWithIdentifier:@"DetailViewController"];

参见 this question了解详情。

进行替换后，您的代码应按预期工作。

编辑::这是您的方法的外观:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UIViewController* detailViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"DetailViewController"];
    NSMutableString *object = thisArray[indexPath.row];
    detailViewController.passedData = object;
    [self.navigationController pushViewController:detailViewController animated:YES];
}