CODEWITHSUNDEEP
iosswiftuicollectionviewnsindexpath
jmcastel
jmcastel

Reputation: 1365

How to get a selected item in collection view using indexPathsForSelectedItems

I have a collectionView of photos and want to pass the photo who was cliked to a detailViewControler.

The collection data come from :

 var timeLineData:NSMutableArray = NSMutableArray ()

I would like to use the prepare for segue method.

My problem is how to get the good indexPath from the cell who was clicked ?

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue == "goToZoom" {
        let zoomVC : PhotoZoomViewController = segue.destinationViewController as PhotoZoomViewController
        let cell = sender as UserPostsCell

        let indexPath = self.collectionView!.indexPathForCell(cell)
        let userPost  = self.timeLineData.objectAtIndex(indexPath!.row) as PFObject
        zoomVC.post = userPost

    }
}

Upvotes: 18

Views: 51615

Answers (5)

Bosoud
Bosoud

Reputation: 158

Objective-c :

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

        PhotoZoomViewController  *zoomVC   = [segue destinationViewController];
        NSIndexPath  *path    = [self.collectionView indexPathForCell:(sender)];
        NSDictionary *dataObj = [timeLineData objectAtIndex:path.row];

        // In PhotoZoomViewController create NSDictionary with name myDictionary
        // in this line will copy the dataObj to myDictionary
        zoomVC.myDictionary   = dataObj;

}

Swift :

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

       let zoomVC = segue.destinationViewController as PhotoZoomViewController
       let cell = sender as UICollectionViewCell
       let indexPath = self.collectionView!.indexPathForCell(cell)
       let userPost  = self.timeLineData.objectAtIndex(indexPath.row) as PFObject
        zoomVC.post = userPost

}

Upvotes: -1

tuandapen
tuandapen

Reputation: 284

In swift 3:

let index = self.collectionView.indexPathsForSelectedItems?.first

Upvotes: 7

fs_tigre
fs_tigre

Reputation: 10738

Swift 3.0

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == “segueID”{
        if let destination = segue.destination as? YourDestinationViewController{
            let cell = sender as! UICollectionViewCell
            let indexPath = myCollectionView.indexPath(for: cell)
            let selectedData = myArray[(indexPath?.row)!]

            // postedData is the variable that will be sent, make sure to declare it in YourDestinationViewController
            destination.postedData = selectedData
        }
    }
}

Upvotes: 2

rdelmar
rdelmar

Reputation: 104082

The sender argument in prepareForSegue:sender: will be the cell if you connected the segue from the cell. In that case you can get the indexPath from the cell,

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "showZoomController" {
       let zoomVC = segue.destinationViewController as PhotoZoomViewController
       let cell = sender as UICollectionViewCell
       let indexPath = self.collectionView!.indexPathForCell(cell)
       let userPost  = self.timeLineData.objectAtIndex(indexPath.row) as PFObject
        zoomVC.post = userPost
    }
}

Upvotes: 38

pbasdf
pbasdf

Reputation: 21536

The indexPathsForSelectedItems returns an array of indexPaths (since there might be several items selected) so you need to use:

let indexPaths : NSArray = self.collectionView!.indexPathsForSelectedItems()
let indexPath : NSIndexPath = indexPaths[0] as NSIndexPath

(You should probably test to see whether several items are selected, and handle accordingly).

Upvotes: 17

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