ios 如何在 prepareForSegue 中获取索引路径

How to get indexpath in prepareForSegue

提问by Pintu Rajput

- (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];
    }
}

i wanna to access the selected row index,but show nullfor every selected row. please help me?

我想访问选定的行index，但显示null每个选定的行。请帮我？

回答by Suhail kalathil

Two cases:

两种情况：

1. Segueconnected from the viewController

   Call seguefrom your didSelectRowAtIndexPathmethod, pass indexPathas sender

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

   Then you can get indexPath as sender in prepareForSegue:sender:method

   - (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. segue connected from the cell

   No need to implement didSelectRowAtIndexPathmethod and performSegueWithIdentifier:.You can directly get senderas UITableviewCellin prepareForSegue:sender:method.

   - (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];
       }
   }
   

1. Segue从连接 viewController

   segue从您的didSelectRowAtIndexPath方法调用，传递indexPath为sender

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

   然后你可以在prepareForSegue:sender:方法中获取 indexPath 作为发送者

   - (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

   不需要实现didSelectRowAtIndexPathmethod和performSegueWithIdentifier:。可以直接get senderas UITableviewCellin prepareForSegue:sender:method。

   - (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];
       }
   }
   

回答by tonethar

Swift 3.0 / iOS 10

斯威夫特 3.0 / iOS 10

tableView.indexPathForSelectedRowwas introduced in iOS 9

tableView.indexPathForSelectedRow在 iOS 9 中引入

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if let indexPath = tableView.indexPathForSelectedRow{
        let selectedRow = indexPath.row
        let detailVC = segue.destination as! ParkDetailTableVC
        detailVC.park = self.parksArray[selectedRow]
    }
}

回答by onmyway133

Like this

像这样

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(UITableViewCell *)sender {
    FTGDetailVC *detailVC = (id)segue.destinationViewController;
    NSIndexPath *indexPath = [self.tableView indexPathForCell:sender];

    FTGNote *note = self.notes[indexPath.row];
    [detailVC updateWithNote:note];
}

回答by Alessio Campanelli

sorry, i don't understand what you want to do. it's possible get the indexPath.rowthrough this method of UITAbleViewDelegatethat it's called when you tap the cell of your tableView:

对不起，我不明白你想做什么。有可能获得indexPath.row通过这种方法UITAbleViewDelegate，它当你点击你的tableView的细胞被称为：

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{     
    self.myVariable = indexPath.row
}

and then you can access to this value in the prepareForSeguein this way:

然后你可以通过prepareForSegue这种方式访问这个值：

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
    //do something with self.myVariable
}

I hope i helped you.

我希望我帮助了你。