Question

我有一个照片集合视图，想要将照片传递给一个detailViewControler。

收集数据来自：

 var timeLineData:NSMutableArray = NSMutableArray ()

我想使用准备segue方法。

我的问题是如何从单击的单元格中获取好的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

    }
}

Answer 1

prepareForSegue：sender：中的sender参数将是从单元格连接segue的单元格。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
    }
}

Answer 2

indexPathsForSelectedItems返回一个indexPaths数组（因为可能选择了几个项目）所以你需要使用：

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

（您可能应该测试是否选择了多个项目，并相应处理）。

Answer 3

在swift 3中：

let index = self.collectionView.indexPathsForSelectedItems?.first

Answer 4

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
        }
    }
}

Answer 5

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;

}

快速：

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

}

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

5 个答案:

Swift 3.0