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我在 SwiftUI 项目中使用 LinkPresentation 框架在列表视图中显示丰富的链接。该链接正在显示，但我无法设置（更改）LPLinkView 的框架。LPLinkView 包装在 HStack 中并显示在列表中。


import SwiftUI
import LinkPresentation

struct ContentView: View {
    @State var redrawPreview = false
    let links: [StringLink]  = [StringLink(id: UUID(), string: "https://www.youtube.com/watch?v=HXoVSbwWUIk"),
                                 StringLink(id: UUID(), string: "https://www.youtube.com/watch?v=F2ojC6TNwws"),
                                 StringLink(id: UUID(), string: "https://www.youtube.com/watch?v=bz6GTYaIQXU")]
    var body: some View {
        List(links) { l in
            HStack {
                Image(systemName: "person.fill")
                    .resizable()
                    .scaledToFit()
                    .frame(width: 40.0, height: 40.0)
                LinkRow(previewURL: URL(string: l.string)!, redraw: self.$redrawPreview)
            }
        }.environment(\.defaultMinListRowHeight, 50)
    }
}

struct LinkRow : UIViewRepresentable {
    
    var previewURL:URL
    @Binding var redraw: Bool
    
    func makeUIView(context: Context) -> LPLinkView {
        let view = LPLinkView(url: previewURL)
        
        let provider = LPMetadataProvider()
        provider.startFetchingMetadata(for: previewURL) { (metadata, error) in
            if let md = metadata {
                DispatchQueue.main.async {
                    view.metadata = md
                    view.sizeToFit()
                    self.redraw.toggle()
                }
            }
            else if error != nil
            {
                let md = LPLinkMetadata()
                md.title = "Custom title"
                view.metadata = md
                view.sizeToFit()
                self.redraw.toggle()
            }
        }
        
        return view
    }
    
    func updateUIView(_ view: LPLinkView, context: Context) {
        // New instance for each update
    }
}

struct StringLink : Identifiable{
    var id = UUID()
    var string : String
}

在此处输入图像描述

4

1 回答 1

2

ScrollView + LazyVStack而不是List解决问题。

于 2021-11-14T19:48:54.543 回答