在UITableView List segue之间传递索引号 [英] Pass Index Number between UITableView List segue

问题描述

当我单击UITableView中的某个列表项时，我想将我单击的项的索引传递给下一个详细视图。

When I click a certain list item in my UITableView, I want to pass the index of the item that I clicked on to the next detailed view.

这是我目前的相关代码：

This is my relevant code so far:

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    HomeworkDetails *view =  [[HomeworkDetails alloc] init];


    int lastIndex = [indexPath indexAtPosition:[indexPath length] - 1];
    NSLog(@"%u", lastIndex);

    [self performSegueWithIdentifier: @"HomeworkDetailsSegue" sender:self];
    view.currentIndex = lastIndex;

    [tableView deselectRowAtIndexPath:indexPath animated:YES];

}

此时，我可以成功转到下一个ViewController（HomeworkDetails）但信息未通过。我试图通过 view.currentIndex = lastIndex; 来实现这一点，但这不起作用。我怎么能这样做？对不起，如果我错过了什么我是iOS开发的初学者。

At this point, I can successfully move on to the next ViewController (HomeworkDetails) but the information is not passed through. I am trying to accomplish this by doing view.currentIndex = lastIndex; but this is not working. How else can I do this? Sorry if I missed anything; I am a beginner at iOS development.

有建议：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{


    HomeworkDetails *view =  [[HomeworkDetails alloc] init];


    int lastIndex = [indexPath indexAtPosition:[indexPath length] - 1];
    NSLog(@"%u", lastIndex);

    [self performSegueWithIdentifier: @"HomeworkDetailsSegue" sender:self];
    view.currentIndex = lastIndex;

    [tableView deselectRowAtIndexPath:indexPath animated:YES];



}


- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"HomeworkDetailsSegue"]) {

        // note that "sender" will be the tableView cell that was selected
        UITableViewCell *cell = (UITableViewCell*)sender;
       NSIndexPath *indexPath = [self.tableView indexPathForCell:cell]; //**error**


        HomeworkDetails *vc = (HomeworkDetails*)[segue destinationViewController];
        vc.currentIndex = indexPath.row;
    }
}

推荐答案

你所描述的最好是在 prepareForSegue：sender：方法中完成，而不是 didSelectRowAtIndexPath：。在您的故事板中，确保在tableView的原型单元格和目标视图控制器之间设置 HomeworkDetailsS​​egue segue。

What you are describing can best be done in the prepareForSegue:sender: method, instead of didSelectRowAtIndexPath:. In your storyboard, make sure your HomeworkDetailsSegue segue is set up between your tableView's prototype cell and the destination view controller.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{    
    if ([segue.identifier isEqualToString:@"HomeworkDetailsSegue"]) {

        // note that "sender" will be the tableView cell that was selected
        UITableViewCell *cell = (UITableViewCell*)sender;
        NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];

        HomeworkDetails *vc = (HomeworkDetails*)[segue destinationViewController];
        vc.currentIndex = indexPath.row;
    }
}

另外，作为一种风格，我会推荐将HomeworkDetails类重命名为HomeworkDetailsViewController。这样做会更紧密地遵循Apple的约定，并使类更清楚地表达。

Also, as a matter of style, I would recommend renaming your HomeworkDetails class to HomeworkDetailsViewController. Doing this follows Apple's conventions more closely and makes it clearer what the class represents.

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