如何避免切换视图递归onChange调用SwiftUI

这看起来更像一个Picker，而不是一组Toggle.如果您希望一次只 Select 一件事，请不要使用Toggle.

您可以将Toggle更改为Button:

HStack{
    ForEach($rs.newsCategoryCollection){ $category in
        Button(category.id) {
            if !category.isSelected {
                category.isSelected = true
                rs.unselectOtherCategory(id: category.id)
                viewModel.loadNews()
            }
        }
        .padding(8)
        .background(.accent.opacity(category.isSelected ? 0.1 : 0), in: RoundedRectangle(cornerRadius: 10))
    }
}

这就是说，我建议使用Picker，带有.segmented拾取器样式，看起来像一排按钮.

struct ContentView: View {
    
    @State var rs = ...

    @State var selectedCategory: NewsCategory.ID = "" // assuming NewsCategory.ID is a String

    var body: some View {
        
        Picker(selection: $selectedCategory) {
            ForEach(rs.newsCategoryCollection){ category in
                Text(category.id)
            }
        } label: {
            
        }
        .pickerStyle(.segmented)
        .onChange(of: selectedCategory) {
            viewModel.loadNews()
        }
    }
}

现在，你甚至不需要在NewsCategory号拥有isSelected套房产了.如果你真的因为某些原因需要它，你可以在rs的基础上加一个selectCategory的方法.

// selectCategory could be implemented as:
mutating func selectCategory(id: String) {
    for i in newsCategoryCollection.indices {
        if newsCategoryCollection[i].id != id {
            newsCategoryCollection[i].isSelected = false
        } else {
            newsCategoryCollection[i].isSelected = true
        }
    }
}

那就打onChange分吧.