iOS的RSS小部件14显示为空

如何解决iOS的RSS小部件14显示为空

我为我用Swift编写的应用程序使用XMLParser，并试图为iOS 14设置一个小部件，该小部件将在RSS上显示最新文章。添加后，我看到占位符很好，但是它保持空白，只有一行应该显示文本，而且似乎从未从时间轴获取信息。

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(),description: "News Article Here",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.")
    }
}

解决方法

由OP更新： 确实，时间轴设置在错误的位置，以及解析器中的几次错字造成了这个特定问题。

Apple默认情况下不允许HTTP连接，最简单的解决方案是将URL更改为https://fritchcoc.wordpress.com/feed

如果要允许应用程序（或小部件）中的HTTP连接，可以在目标的Info.plist中添加异常（到一个域或全部），请参阅Apple Docs的NSAppTransportSecurity

修改：
经过更好的外观并找到在线FeedParser的实现之后，我注意到parseFeed()是异步的。

因此，用一个空数组调用完成函数，应在解析完成后调用它：

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)
        }
    }
}