Ios 如何在单元格中为集合视图的索引路径函数调用图像URL和图像视图

我想在集合视图中异步调度8个图像URL。我已经为集合视图单元创建了一个类，并在其中创建了imageview的出口。现在我想从主视图控制器配置imageview。这是密码

    let reuseIdentifier = "PhotosCollectionViewCell" // also enter this string as the cell identifier in the storyboard
   var items = ["1", "2", "3", "4", "5", "6", "7", "8"]

    // tell the collection view how many cells to make
    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
       return self.items.count

    }

    // make a cell for each cell index path
    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

        // get a reference to our storyboard cell
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! PhotosCollectionViewCell


        cell.imageView = imageView

        return cell



    }

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
        // handle tap events
        print("You selected cell #\(indexPath.item)!")
    }



    func loadImage() {
        dispatch_async(dispatch_get_global_queue(QOS_CLASS_USER_INITIATED, 0)) {
            let urlString = "http://charcoaldesign.co.uk/AsyncImageView/Forest/IMG_0352.JPG"
            let url = NSURL(string: urlString)
            let data = NSData(contentsOfURL: url!)
            dispatch_async(dispatch_get_main_queue(), {
             self.imageView.image = UIImage(data: data!)
//              self.items[0] = (data as? String)!

            })

        }
    }
}

---

这里有一个扩展，使事情变得更简单

extension UIImageView {
    func downloadImageFrom(link link:String, contentMode: UIViewContentMode) {
        NSURLSession.sharedSession().dataTaskWithURL( NSURL(string:link)!, completionHandler: {
            (data, response, error) -> Void in
            dispatch_async(dispatch_get_main_queue()) {
                self.contentMode =  contentMode
                if let data = data { self.image = UIImage(data: data) }
            }
        }).resume()
    }
}

cell.imageView.downloadImageFrom(link: imageLinkArray[indexPath.row], contentMode: UIViewContentMode.ScaleAspectFit)  //set your image from link array.

您也可以在下面的url中查找更多帮助。

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谢谢您的回复。这里有8个图像URL。我如何运行循环，以便在集合视图中显示8个图像？请按如下方式将imageurl与imageView一起显示，以便根据您的collectionViewCell动态调用它。loadImage（imageView，url），func loadImage（imageViewObj:UIImageView，url:NSString）我遇到很多错误，请给我一个详细的解决方案在集合视图中使用UIImageView+WebCache处理异步图像

extension UIImageView {
    func downloadImageFrom(link link:String, contentMode: UIViewContentMode) {
        NSURLSession.sharedSession().dataTaskWithURL( NSURL(string:link)!, completionHandler: {
            (data, response, error) -> Void in
            dispatch_async(dispatch_get_main_queue()) {
                self.contentMode =  contentMode
                if let data = data { self.image = UIImage(data: data) }
            }
        }).resume()
    }
}

cell.imageView.downloadImageFrom(link: imageLinkArray[indexPath.row], contentMode: UIViewContentMode.ScaleAspectFit)  //set your image from link array.