正在将 RSS 提要加载到 IOS Swift

Question

我正在尝试将 RSS Feed 加载到 IOS 应用程序。浏览了相当多的教程，找到了下面的内容，但它引发了异常。

来源：https://github.com/tichise/TIFeedParser

 func loadRSS() {

        let feedUrlString:String = "https://news.google.com/news?hl=us&ned=us&ie=UTF-8&oe=UTF-8&output=rss"

        Alamofire.request(feedUrlString).response { response in

            if let data = response.data, let _ = String(data: data, encoding: .utf8) {

                TIFeedParser.parseRSS(xmlData: data as NSData, completionHandler: {(isSuccess, channel, error) -> Void in

                    if (isSuccess) {
                        self.items = channel!.items!
                        self.videoTableView.reloadData()//Exception on this line
                    }

                    if (response.error != nil) {
                        print((response.error?.localizedDescription)! as String)
                    }
                })
            }
        }

    }

异常是线程 1：致命错误：在展开可选值时意外发现 nil

我做错了什么？如果是这样参考或如何解决它？会非常有帮助！

Answer 1

你需要使用if let来避免异常：

if let allItems = channel.items {
       self.items = allItems
       self.videoTableView.reloadData()//Exception on this line
}

I am also able to run your project, please check below simulator image:

正在将 RSS 提要加载到 IOS Swift

Loading RSS Feed to IOS Swift

exception

uitableview

rss-reader

ios

swift