在视图控制器之间传递数据DidSelectRowsAtIndexPath故事板

时间:2013-05-05 00:01:42

标签: ios objective-c uitableview storyboard didselectrowatindexpath

在一个简单的测试应用程序中,我试图将名为“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,UIViewController嵌入在导航控制器中。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代替prepareForSegue。我用过这个:

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

但它没有用。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)如何正确撰写didSelectRowsAtIndexPath以替换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?

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

谢谢!

更新:根据我收到的答案和评论,我写了以下内容:

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

  

***因未捕获的异常NSInvalidArgumentException而终止应用,原因是:'无法找到故事板   在包中命名为DetailViewController

1 个答案:

答案 0 :(得分:10)

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,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"];

有关详细信息,请参阅this question

完成替换后,您的代码应按预期工作。

编辑::以下是您的方法的外观:

- (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];
}