相冊應用程序swift lang，有錯誤的情侶功能

Question

1. 錯誤消息「'String？'是無法轉換爲 '字符串'」

   override func prepareForSegue(segue: UIStoryboardSegue, sender:         AnyObject?) { 
   **if(segue.identifier as String == "viewLargePhoto")**{ 
       let controller:ViewPhoto = segue.destinationViewController as  ViewPhoto 
   let indexPath: NSIndexPath =    self.collectionView.indexPathForCell(sender as UICollectionViewCell) 
   
   controller.photoAsset = self.photoAsset 
   controller.assetCollection = self.assetCollection 
   

2. 錯誤消息：找不到成員 'AspectFill'

   let asset: PHAsset = self.photoAsset[indexPath.item] as! PHAsset 
   PHImageManager.defaultManager().requestImageForAsset(asset,   targetSize: PHImageManagerMaximumSize, contentMode: .AspectFill, options:   nil, 
       resultHandler: {(result:UIImage!, info:NSDictionary!)in 
       cell.setThumbnailImage(result) 
   }) 
   
        return cell 
   

請幫忙，謝謝您

Answer 1

儘量省略明確的類型在您的resultHandler函數上聲明info。
爲我工作。