ios 如何使用 indexPathsForSelectedItems 在集合视图中获取所选项目

How to get a selected item in collection view using indexPathsForSelectedItems

提问by jmcastel

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

我有一个照片的 collectionView 并且想要传递被点击到 detailViewControler 的照片。

The collection data come from :

采集数据来自：

 var timeLineData:NSMutableArray = NSMutableArray ()

I would like to use the prepare for segue method.

我想使用准备转场方法。

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

我的问题是如何从被点击的单元格中获得好的 indexPath ？

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

    }
} 

回答by rdelmar

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,

如果您从单元连接了 segue，prepareForSegue:sender: 中的 sender 参数将是单元。在这种情况下，您可以从单元格中获取 indexPath，

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
    }
} 

回答by pbasdf

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

在indexPathsForSelectedItems返回indexPaths数组（因为可能有选择的几个项目），所以你需要使用：

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).

（您可能应该测试以查看是否选择了多个项目，并进行相应处理）。

回答by tuandapen

In swift 3:

在快速 3 中：

let index = self.collectionView.indexPathsForSelectedItems?.first

let index = self.collectionView.indexPathsForSelectedItems?.first

回答by fs_tigre

Swift 3.0

斯威夫特 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
        }
    }
}

回答by BoSoud

Objective-c:

目标-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:

斯威夫特：

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

}