IndexPath for segue from accessoryButton

问题

I am attempting to use a storyboard/segue to handle the transition between a UITableView with both standard transition as well as detail disclosure button. Having read a few different posts on here I have set up my project this way:

Tie main segue between UITableViewCell and ViewController
Tie secondary segue from parent ViewController to new ViewController

Implement accessoryButtonTappedForRowWithIndexPath as follows:

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

This works great and my prepareForSegue: sender: gets called as expected. The trouble is, I need to know the indexPath for the element selected. The segue from the UITableViewCell retrieves the indexPath like this:

NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];

Unfortunately when I try to do that having called the accessoryButton, that returns null.

The original question I am basing some of this code off of is here: Detail Disclosure Button and Segues

Is there a method of the tableView which returns indexPath for accessoryButtons? Do I need to access the indexPath in some other manner?

回答1:

You don't have to override accessoryButtonTappedForRowWithIndexPath.

In prepareForSegue, when working with a detail disclosure button, instead of:

[self.tableView indexPathForSelectedRow]

use:

[self.tableView indexPathForCell:sender]

The sender is already the detail disclosure button's cell.

回答2:

The sender argument is, according to the documentation:

The object that you want to use to initiate the segue. This object is made available for informational purposes during the actual segue.

I don't see any reason why you can't use the index path as the sender instead of self, then access the index path in prepareForSegue:.

If that doesn't work, store the index path in an ivar and access that in prepareForSegue

来源：https://stackoverflow.com/questions/9339302/indexpath-for-segue-from-accessorybutton

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iphone

storyboard