Swift 2 - 从URL加载图像或视频时显示加载视图

Question

我正在尝试从网址中提取图片时显示加载视图。我知道如何使用UIWebview执行此操作但是，我无法使用UIImageView或MPMoviePlayerController找到实现此目的的方法。

要从Url加载图片或视频，请使用：

 let pictureURL = NSURL(string: pictureToDisplay!)
 newsImage.hnk_setImageFromURL(pictureURL!)

或

let videoURL = NSURL(string: sourceToDisplay!)
moviePlayer = MPMoviePlayerController(contentURL: videoURL!)

有没有办法在加载网址时显示和隐藏加载视图loading_view.hidden = false - loading_view.hidden = true？

Answer 1

使用NSURLConnectionDelegate解决。

func requestNSURLconnection(url: NSURL){
        let request: NSURLRequest = NSURLRequest(URL: url)
        let connection: NSURLConnection = NSURLConnection(request: request, delegate: self, startImmediately: true)!
        connection.start()
    }


    func connectionDidFinishLoading(connection: NSURLConnection!)
    {

        print("finishedLoading")
    }