ios - Twitter 用户图像解析 - Swift

Question

我正在尝试使用以下代码从 twitter(解析-twitter 登录)获取用户图像:

 if PFTwitterUtils.isLinkedWithUser(PFUser.currentUser()!) {

        let screenName = PFTwitterUtils.twitter()?.screenName!
        let requestString = NSURL(string: "https://api.twitter.com/1.1/users/show.json?screen_name=" + screenName!)
        let request = NSMutableURLRequest(URL: requestString!, cachePolicy: .ReloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 5.0)
        PFTwitterUtils.twitter()?.signRequest(request)
        let session = NSURLSession.sharedSession()

        session.dataTaskWithRequest(request, completionHandler: {(data, response, error) in
            print(data)
            print(response)
            print(error)

            if error == nil {
                var result: AnyObject?
                do {
                    result = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)
                } catch let error2 as NSError? {
                    print("error 2 \(error2)")
                }

                let names: String! = result?.objectForKey("name") as! String
                let separatedNames: [String] = names.componentsSeparatedByString(" ")

                //self.firstName = separatedNames.first!
                //self.lastName = separatedNames.last!

                let urlString = result?.objectForKey("profile_image_url_https") as! String
                let hiResUrlString = urlString.stringByReplacingOccurrencesOfString("_normal", withString: "", options: NSStringCompareOptions.LiteralSearch, range: nil)
                let twitterPhotoUrl = NSURL(string: hiResUrlString)
                let imageData = NSData(contentsOfURL: twitterPhotoUrl!)
                let twitterImage: UIImage! = UIImage(data:imageData!)
                self.userImg = UIImageView(image: twitterImage)
            }
        }).resume()
    }

但 imageData 为零

  let imageData = NSData(contentsOfURL: twitterPhotoUrl!) 
  let twitterImage: UIImage! = UIImage(data:imageData!)

twitterphotoUrl actually have the link

有什么帮助吗？？？

Answer 1

我猜测您从 pbs.twimg.com URL 中收到了 ATS 异常，因此您没有获取数据，因此在强行打开数据时您会摔倒。您应该将该域添加到 ATS 异常(exception)列表中，如图所示 here , [在此处记录] ( https://developer.apple.com/library/ios/documentation/General/Reference/InfoPlistKeyReference/Articles/CocoaKeys.html )(在该页面上搜索 NSExceptionDomain)并在许多其他地方进行了讨论。

除此之外，强制解包 URL 调用的结果始终是一个坏主意，因为许多事情都可能阻止创建数据对象。在这种情况下，您应该使用 guard 或 if let 语句。