从 Realm requestResults 创建一个分组列表

Question

从 Realm 查询和排序后：

    // fetch all Items sorted by Type
    let results = realm.objects(Paper.self).sorted(byKeyPath: "Type", ascending: false)
    
    var paperCollatedByType: [String : [Paper]] {
        Dictionary(grouping: results, by: { $0.type })
    }
    
    // pulls out the keys from the dictionary made above, sorted
    var uniqueType: [String] {
        paperCollatedByDate.map({ $0.key }).sorted()
    }

这是我制作列表的来源：

["kyasutoYellowSeparator": [Paper {
    type = kyasutoYellowSeparator;
    width = 111;
    rollLength = 600;
    quantity = 1;
    importDate = 2020-06-28 12:11:19 +0000;
    totalLength = 600;
    isSlitted = 1;
}, Paper {
    type = kyasutoYellowSeparator;
    width = 12;
    rollLength = 600;
    quantity = 1;
    importDate = 2020-06-28 03:18:22 +0000;
    totalLength = 600;
    isSlitted = 0;
}]]

我正在考虑创建一个按类型“kyasutoYellowSeparator”分组的列表：

List {
         ForEach(paperCollatedByDate, id: \.self) { (section: [Paper]) in
                Section(header: Text(section[0].type)) {
                      ForEach(section, id: \.self) { paper in
                          Text(paper.type)
                      }
               }
          }//end of list

但它完全失败了，请帮助我制作列表。感谢您花时间阅读我的问题。

Answer 1

这里是固定变体（使用 Xcode 11.4 在复制的简化模型上测试）

List {
    ForEach(paperCollatedByDate.keys.sorted(), id: \.self) { section in
        Section(header: Text(self.paperCollatedByDate[section]!.first?.type ?? "")) {
            ForEach(self.paperCollatedByDate[section]!, id: \.self) { paper in
                Text(paper.type)
            }
        }
    }
}