ios - 如何使用 indexPathsForSelectedItems 在 Collection View 中获取选定项

Question

我有一个照片的 collectionView，想将被点赞的照片传递给 detailViewControler。

采集数据来自:

 var timeLineData:NSMutableArray = NSMutableArray ()

我想使用 prepare for segue 方法。

我的问题是如何从被点击的单元格中获取正确的 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 参数将是单元格，如果你从单元格连接 segue。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
    }
}