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
})