SwiftUI know when new page from TabView is activated

Question

Gargoyle OP

Created Dec ’20

Replies 1

Boosts 0

Participants 2

In my view I've done this:

Code Block swiftvar body: some View {
  TabView {
    DayView(summary: History.shared.today())
    DayView(summary: History.shared.thisWeek())
    DayView(summary: History.shared.thisMonth())
  }
  .tabViewStyle(PageTabViewStyle())
}

how do I tell the appropriate DayView when it has become the active page? If it matters for implementation, this is specifically when using WatchOS.

Boost

Answer 1

BabyJ OP

Dec ’20

You can pass in a variable

Code Block Swift@State private var selectedTab = 0

to the TabView and to the DayViews

Code Block SwiftTabView(selection: $selectedTab) {
	DayView(summary: History.shared.today(), tab: $selectedTab).tag(0)
	DayView(summary: History.shared.thisWeek(), tab: $selectedTab).tag(1)
	DayView(summary: History.shared.thisMonth(), tab: $selectedTab).tag(2)
}

1