RSS Widget For iOS 14 顯示為空

Question

我在 Swift 中為我的應用程序使用了一個 XMLParser，並且正在嘗試為 iOS 14 設置一個小部件，它將在其中顯示 RSS 上的最新文章。 添加時我看到占位符很好，但它仍然是空的，只有一行文本應該是文本，而且似乎永遠不會從時間軸中獲取信息。

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

OP 更新：確實是時間軸設置在錯誤位置的組合，以及導致此特定問題的解析器中的幾個拼寫錯誤。

Apple 默認不允許 HTTP 連接，最簡單的解決方案是將 URL 更改為https://fritchcoc.wordpress.com/feed

如果您想在您的應用程序（或小部件）中允許 HTTP 連接，您可以在目標的 Info.plist 中添加例外（到一個域或所有域），請參閱Apple Docs上的 NSAppTransportSecurity

編輯：
在仔細查看並在線查找FeedParser的實現后，我注意到parseFeed()是異步的。

因此用一個空數組調用完成，它應該在解析完成后調用：

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)
        }
    }
}