ios - 如何在 prepareForSegue 中获取索引路径

Question

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
    {
    if ([segue.identifier isEqualToString:@"Action"])
    {
        NSIndexPath *indexPath = [self.tbl indexPathForSelectedRow];
        SecondViewController *destViewController = segue.destinationViewController;
        destViewController.getString = [getArray objectAtIndex:indexPath.row];
    }
}

我想访问选定的行 index，但为每个选定的行显示 null。请帮帮我？

Answer 1

两种情况:

1. Segue从 viewController 连接

   调用segue来自你的 didSelectRowAtIndexPath方法，通过 indexPath作为sender

   -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
   {
       [self performSegueWithIdentifier:@"Action" sender:indexPath];
   }
   

   然后你可以在prepareForSegue:sender:中获取作为发件人的indexPath方法

   - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
   {
       if ([segue.identifier isEqualToString:@"Action"])
       {
           NSIndexPath *indexPath = (NSIndexPath *)sender;
           SecondViewController *destViewController = segue.destinationViewController;
           destViewController.getString = [getArray objectAtIndex:indexPath.row];
       }
   }
   

2. 从单元格连接的segue

   无需实现 didSelectRowAtIndexPath方法和performSegueWithIdentifier: .你可以直接得到sender作为UITableviewCell在prepareForSegue:sender:方法。

   - (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
   {
       if ([segue.identifier isEqualToString:@"Action"])
       {
           NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];
           SecondViewController *destViewController = segue.destinationViewController;
           destViewController.getString = [getArray objectAtIndex:indexPath.row];
       }
   }