相册App swift lang，情侣功能有误

Question

1. 错误消息＆＃34;＆＃39;字符串？＆＃39;不能转换为＆＃39; String＆＃39;＆＃34;

   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. 错误消息：无法找到成员＆＃39; AspectFill＆＃39;

   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
   

请帮助并谢谢

Answer 1

尝试在info函数中省略resultHandler的显式类型声明。
为我工作。