Swift - 异步加载图片

下面是一个异步请求加载图片数据的样例

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//定义NSURL let imgURL:NSURL=NSURL(string:"http://hangge.com/blog/images/logo.png")! //定义NSURLRequest let request:NSURLRequest=NSURLRequest(URL:imgURL) //异步获取图片 NSURLConnection.sendAsynchronousRequest(request, queue: NSOperationQueue.mainQueue(),     completionHandler: {(response:NSURLResponse!,data:NSData!,error:NSError!)->Void in     //将图片数据赋予UIImage     let img=UIImage(data:data)     self.BgImageView.image = img })