OutlineGroup in List: Not Work
Hierarchical List: Not Work
Pure List: Work
Is it a bug or SwiftUI doesn't support it yet?
Should I use cocoa OutlineView for this feature?
Reproduce:
Copy and Paste code below, and drag items.
import SwiftUI
import PlaygroundSupport
var greeting = "Hello, playground"
struct FileItem: Hashable, Identifiable {
var id: Self { self }
var name: String
var children: [FileItem]? = nil
}
let data = FileItem(name: "users", children:
[FileItem(name: "user1234", children:
[FileItem(name: "Photos", children:
[FileItem(name: "photo001.jpg"),
FileItem(name: "photo002.jpg")]),
FileItem(name: "Movies", children:
[FileItem(name: "movie001.mp4")]),
FileItem(name: "Documents", children: [])]),
FileItem(name: "newuser", children:
[FileItem(name: "Documents", children: [])])])
struct ContentView: View {
var body: some View {
VStack {
Text("Not Work - OutlineGroup in List")
List {
OutlineGroup(data, children: \.children) { item in
Text("\(item.name)")
.itemProvider { NSItemProvider(object: item.name as NSString) }
}
}
Text("Not Work - Hierarchical List")
List {
OutlineGroup(data, children: \.children) { item in
Text("\(item.name)")
.itemProvider { NSItemProvider(object: item.name as NSString) }
}
}
Text("Work - Pure List")
List([
FileItem(name: "Documents", children: []),
FileItem(name: "Files", children: [])
]) { item in
Text("\(item.name)")
.itemProvider { NSItemProvider(object: item.name as NSString) }
}
}
.frame(width: 320, height: 800)
}
}
PlaygroundPage.current.setLiveView(ContentView())
cancue
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A item is replaced by the last uncle.
Conditions are: Target to macOS
The item "X" is placed next to the folded sibling with children.
The parent of the "X" is not the last sibling.
The last uncle "Y" has no children.
then, "X" will be replaced by "Y", and "Y" appears twice.
It's amazing that the very fundamental operations are broken.
As this issue only occurs on macOS, it is not reproduced on playground preview or iOS.
import SwiftUI
struct TreeViewTest: View {
var items: [Item]
var body: some View {
List(
items,
children: \.children
) { item in
Text(item.id)
}
}
struct Item: Hashable, Identifiable {
var id: String
var children: [Self]?
}
}
struct TreeViewTest_Previews: PreviewProvider {
static var previews: some View {
TreeViewTest(items: [
.init(id: "0", children: [
.init(id: "00"),
.init(id: "01", children: [
.init(id: "010"),
.init(id: "011"),
.init(id: "012")
]),
.init(id: "02"),
.init(id: "03")
]),
.init(id: "1")
])
}
}
It represents:
0
-00
+01
-1 /* <- should be 02 */
-03
1
Is there anything wrong with my code?
If it is a bug, is there a temporary hacky workaround?