TabView（SwiftUI）：在已激活的tabItem上响应onTab

这是可能的方法。经过Xpre 11.4 / iOS 13.4测试

struct TestTabSelectionAction: View {    @State private var selectedTab = 0    var body: some View {        let selection = Binding<Int>( get: { self.selectedTab }, set: { self.selectedTab = $0     print("Pressed tab: ($0)")     if $0 == 0 {     // <<< your action here !!     }        })        return TabView(selection: selection) { View1() .tabItem {     Image(systemName: "doc.plaintext")         .font(.system(size: 25))     Text("View1") }.tag(0) View2()     .tabItem {         Image(systemName: "person.crop.circle")  .font(.system(size: 25))         Text("View2") }.tag(1)        }    }}