ios - iOS 14 的 RSS 小部件显示为空

Question

我为我用 Swift 编写的应用程序使用 XMLParser，并尝试为 iOS 14 设置一个小部件，其中将显示 RSS 上的最新文章。当我添加它时，我看到占位符很好，但它只剩下一行文本应该是空的，而且似乎永远不会从时间轴中获取信息。

struct Provider: TimelineProvider {
    @State private var rssItems:[RSSItem]?
    let feedParser = FeedParser()
    func placeholder(in context: Context) -> SimpleEntry {
        SimpleEntry(date: Date(), title:"News", description: "News article here", link: "Http://link", pubDate: "The day it posted")
    }

    func getSnapshot(in context: Context, completion: @escaping (SimpleEntry) -> ()) {
        let entry = SimpleEntry(date: Date(), title:"News", description: "News Article Here", link: "Http://link", pubDate: "The day it posted")
        completion(entry)
    }

    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> ()) {
        var entries: [SimpleEntry] = []
        feedParser.parseFeed(url: "http://fritchcoc.wordpress.com/feed") {(rssItems) in
            self.rssItems = rssItems
            let currentDate = Date()
                let entry = SimpleEntry(date: currentDate, title:rssItems[0].title, description: rssItems[0].description, link: rssItems[0].link, pubDate: rssItems[0].pubDate)
                entries.append(entry)
            
        
      
        }

        let timeline = Timeline(entries: entries, policy: .atEnd)
        completion(timeline)
    }
}

struct SimpleEntry: TimelineEntry {
    let date: Date
    let title: String
    let description: String
    let link: String
    let pubDate: String
}

struct FritchNewsEntryView : View {
    var entry: SimpleEntry
    var body: some View {
            VStack(alignment: .leading, spacing: 4) {
                
                Text(entry.title)
               
                   
                
              
            }.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .leading)
                .padding()
                .background(LinearGradient(gradient: Gradient(colors: [.orange, .yellow]), startPoint: .top, endPoint: .bottom))
        }
    
}

@main
struct FritchNews: Widget {
    let kind: String = "FritchNews"

    var body: some WidgetConfiguration {
        StaticConfiguration(kind: kind, provider: Provider()) { entry in
            FritchNewsEntryView(entry: entry)
        }
        .configurationDisplayName("My Widget")
        .description("This is an example widget.")
    }
}

Answer 1

由 OP 更新:
这确实是时间线设置在错误位置的组合，以及解析器中的几个拼写错误导致了这个特定问题。
苹果默认是不允许HTTP连接的，最简单的解决办法就是把URL改成https://fritchcoc.wordpress.com/feed如果您想在您的应用程序(或小部件)中允许 HTTP 连接，您可以在目标的 Info.plist 中添加异常(exception)(到一个域或所有域)，请参阅 Apple Docs 上的 NSAppTransportSecurity
编辑:
经过更好的查看和发现 FeedParser 的实现在网上，我注意到 parseFeed()是异步的。
因此使用空数组调用完成，它应该在解析完​​成后调用:

struct Provider: TimelineProvider {
    ...

    func getTimeline(in context: Context, completion: @escaping (Timeline<SimpleEntry>) -> ()) {
        var entries: [SimpleEntry] = []
        feedParser.parseFeed(url: "http://fritchcoc.wordpress.com/feed") {(rssItems) in
            self.rssItems = rssItems
            let currentDate = Date()
            let entry = SimpleEntry(date: currentDate, title:rssItems[0].title, description: rssItems[0].description, link: rssItems[0].link, pubDate: rssItems[0].pubDate)
            entries.append(entry)
            
        
            let timeline = Timeline(entries: entries, policy: .atEnd)
            completion(timeline)
        }
    }
}