UICollectionView prepareForSegue indexPathForCell爲零的iOS 9

Question

問題是這樣的線回零：

if let indexPath = self.collectionView?.indexPathForCell(sender as! UICollectionViewCell) 

出於這個原因，我不能傳遞任何信息，該標識符被設置，該委託被設置。

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "DetalleSegueIdentifier" { 
     if let indexPath = self.collectionView?.indexPathForCell(sender as! UICollectionViewCell) { 
      let detailVC = segue.destinationViewController as! DetalleNoticiaViewController 
      detailVC.contact = self.noticia[indexPath.row] 
     } 
    } 
} 

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 
    self.performSegueWithIdentifier("DetalleSegueIdentifier", sender: collectionView.cellForItemAtIndexPath(indexPath)) 
} 

任何幫助？

Answer 1

問題是變種的CollectionView是不是在我的ViewController引用這個原因總是返回零。我的錯誤感謝你的答案。

@IBOutlet weak var collectionView: UICollectionView! 

Answer 2

問題是如何嘗試恢復單元格。您必須在performSegueWithIdentifier中傳遞單元格，然後在prepareForSegue中恢復它。 下面是代碼：

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 
    self.performSegueWithIdentifier("DetalleSegueIdentifier", sender: collectionView.cellForItemAtIndexPath(indexPath)) 
} 

然後

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
    if segue.identifier == "DetalleSegueIdentifier" { 
     if let cell = sender as? UICollectionViewCell{ 
      let indexPath = self.collectionView!.indexPathForCell(cell) 
      let detailVC = segue.destinationViewController as! DetalleNoticiaViewController 
      detailVC.contact = self.noticia[indexPath.row] 

     } 

    } 
} 

希望它能幫助！

Answer 3

嘗試這樣的..

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) { 
     self.performSegueWithIdentifier("DetalleSegueIdentifier", sender: indexPath) 
    } 

，讓你的indexpath這樣的...

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) { 
     if segue.identifier == "DetalleSegueIdentifier" { 

      let aIndPath = sender as! NSIndexPath 

      let detailVC = segue.destinationViewController as! DetalleNoticiaViewController 
      detailVC.contact = self.noticia[aIndPath.item] 
     } 
    }