以编程方式更改为SwiftUI中的另一个选项卡

问题描述

我正在尝试在SwiftUI中实现，您可以在其中一个选项卡上的视图中按一个按钮，然后将其更改为另一个选项卡.我会使用UIKit:

I'm trying to implement in SwiftUI where you press a button in a view on one tab, it changes to another tab. I would do with UIKit:

if [condition...button pressed] {
    self.tabBarController!.selectedIndex = 2
}

但是有没有等效的方法可以在SwiftUI中实现这一目标?

But is there an equivalent way to achieve this in SwiftUI?

推荐答案

您只需要更新负责选择的 @State 变量即可.但是，如果要从子视图执行此操作，可以将其作为 @Binding 变量传递:

You just need to update a @State variable responsible for the selection. But if you want to do it from a child View you can pass it as a @Binding variable:

struct ContentView: View {
    @State private var tabSelection = 1
    
    var body: some View {
        TabView(selection: $tabSelection) {
            FirstView(tabSelection: $tabSelection)
                .tabItem {
                    Text("Tab 1")
                }
                .tag(1)
            Text("tab 2")
                .tabItem {
                    Text("Tab 2")
                }
                .tag(2)
        }
    }
}

struct FirstView: View {
    @Binding var tabSelection: Int
    var body: some View {
        Button(action: {
            self.tabSelection = 2
        }) {
            Text("Change to tab 2")
        }
    }
}

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