在视图控制器之间传递数据DidSelectRowsAtIndexPath故事板 [英] Passing Data Between View Controllers DidSelectRowsAtIndexPath Storyboards

问题描述

在一个简单的测试应用程序中，我试图将一个名为thisArray的数组对象从 MasterViewController 传递给<$ c中名为passedData的字符串$ C> DetailViewController 。我正在使用Storyboard，并且 UIViewController 嵌入在导航控制器中。使用 prepareForSegue 方法，我成功传递了 UIViewController 之间的数据：

In a simple test app, i have tried to pass an array object named "thisArray" from the MasterViewController to the a string named "passedData" in the DetailViewController. I am using Storyboards and the UIViewController are embedded inside the navigation controller. Using the prepareForSegue method, i successfully passed the data between the UIViewController:

- (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];
    }
}

现在由于某些原因我想使用 didSelectRowsAtIndexPath 而不是 prepareForSegue 。我用过这个：

Now for some reasons i want to use didSelectRowsAtIndexPath instead of prepareForSegue. I have used this:

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

但它不起作用。我使用了以下内容：

But it didn't work. I have used the following:

- (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];  
}

但它也不起作用。

问题：

1）如何正确写入 didSelectRowsAtIndexPath 替换 prepareForSegue ？

2）如果我使用 didSelectRowsAtIndexPath ，我是否需要删除故事板中 UIViewController 之间的segue连接？

2) If i use didSelectRowsAtIndexPath, do i need to remove the segue connection between the UIViewController in the Storyboard?

3）如果视图控制器之间确实没有segue连接怎么办，我怎样才能使用 didSelectRowAtIndexPath <在它们之间传递数据/ code>？

3) What if there is really no segue connection between the view controllers, how can i still pass the data between them using didSelectRowAtIndexPath?

谢谢！

更新：根据我收到的答案和评论，我写了以下内容：

UPDATE: Based on the answer and the comments i received, i have wrote the following:

首先我删除了控制器之间的segue连接，设置了StoryBoard id DetailViewController ，类的名称也是 DetailViewController 。

First i have removed the segue connection between the controllers, set the StoryBoard id DetailViewController, the name of the class is also 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：

***因未捕获的异常终止应用程序 NSInvalidArgumentException ，原因：'可以找不到故事板
名为 DetailViewController in bundle

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

推荐答案

你的第二次尝试几乎是正确的。唯一不太正确的是从故事板中实例化视图控制器的方式：使用 initWithNibNamed：，这是您使用NIB而不是故事板。对于故事板，你需要这个：

Your second attempt is nearly right. The only thing that's not quite correct is the way you instantiate a view controller from a storyboard: you use initWithNibNamed:, which is what you use with NIBs but not with storyboards. For storyboards, you need this:

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"];

请参阅这个问题了解详情。

一旦你做了替换，你的代码应该按预期工作。

Once you make the replacement, your code should work as expected.

编辑：：以下是您的方法的外观：

EDIT :: Here is how your method would look:

- (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];
}

这篇关于在视图控制器之间传递数据DidSelectRowsAtIndexPath故事板的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！