小编Nat*_*cks的帖子

enum SectionType: String, CaseIterable {
    case top = "Top"
    case best = "Best"
}

struct ContentView : View {
    @State private var selection: Int = 0

    var body: some View {
        SegmentedControl(selection: $selection) {
            ForEach(SectionType.allCases.identified(by: \.self)) { type in
                Text(type.rawValue).tag(type)
            }
        }
    }
}

How do I run code (e.g print("Selection changed to \(selection)") when the $selection state changes? I looked through the docs and I couldn't find anything.

我正在将约500行数据加载到中List。当我有10行时还可以，但是现在我有500行，这非常慢。有什么我可以做的来改善它的性能吗？

        List {
            SegmentedControl(selection: $feedType) {
                ForEach(FeedType.allCases.identified(by: \.self)) { type in
                    Text(type.rawValue)
                }
            }

            ForEach(store.stories) { story in
                NavigationButton(destination: Text("")) {
                    StoryRow(story: story)
                }
            }
        }

I'm trying to create an input similar like this (?) with SwiftUI.

I've made progress but I can't figure out how to change the height of the text fields and make the input text size bigger.

如何将视图（在这种情况下为标签/文本）固定到屏幕的边缘SwiftUI？使用情节提要，我只会使用，AutoLayout但无法使用SwiftUI。

我正在尝试SFSafariViewController从a 呈现一个，NavigationButton但是我不确定如何使用SwiftUI。

在UIKit中，我只会做：

let vc = SFSafariViewController(url: URL(string: "https://google.com"), entersReaderIfAvailable: true)
    vc.delegate = self

    present(vc, animated: true)