如何在单元格中显示UIImage数组？

Question

我有一个用Parse的PFFiles填充的UIImage数组。

如何将UIImages放入单元格？

以下是我的代码。

var arrayOfFriends = [UIImage]()

    var imagequery = PFQuery(className: "_User")
    query.findObjectsInBackgroundWithBlock {( objects: [AnyObject]?, error: NSError?) -> Void in
        for object in objects!{
            let userPic = object["ProPic"] as! PFFile
            userPic.getDataInBackgroundWithBlock({ (imageData: NSData?, error: NSError?) -> Void in
                if(error == nil){
                    let image = UIImage(data: imageData!)
                    self.arrayOfFriends.append(image!)
                    print(self.arrayOfFriends)
                }
                dispatch_async(dispatch_get_main_queue()) {
                    self.collectionView.reloadData()
                }
            })

        }
    }
 func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell: friendcellView = collectionView.dequeueReusableCellWithReuseIdentifier("friendcell", forIndexPath: indexPath) as! friendcellView


    //this is where the error occurs(error message above)
    cell.friendpic.image = UIImage(named: arrayOfFriends[indexPath.row])
    cell.friendpic.layer.cornerRadius = cell.friendpic.frame.size.width/2;
    cell.friendpic.clipsToBounds = true


    return cell
}

Answer 1

你已经拥有它：

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell: friendcellView = collectionView.dequeueReusableCellWithReuseIdentifier("friendcell", forIndexPath: indexPath) as! friendcellView


    //this is where the error occurs(error message above)
    // change this line
    // cell.friendpic.image = UIImage(named: arrayOfFriends[indexPath.row])
    cell.friendpic.image = arrayOfFriends[indexPath.row] // here, arrayOfFriends[indexPath.row] is a UIImage, you don't have to do anything more
    cell.friendpic.layer.cornerRadius = cell.friendpic.frame.size.width/2;
    cell.friendpic.clipsToBounds = true


    return cell
}

Answer 2

只需更改此行

即可

cell.friendpic.image = UIImage(named: arrayOfFriends[indexPath.row])

到此：

cell.friendpic.image = arrayOfFriends[indexPath.row]

Answer 3

   arrayOfFriends[indexPath.row].getDataInBackgroundWithBlock { (data: NSData?, erreur: NSError?) -> Void in
        if erreur == nil {
            let image = UIImage(data: data)
            cell.friendpic.image = image
        }
    }

这是在cellForRowAtIndexPath

中