How to conditionally set TabView's $selection

Question

Created Aug ’20

Replies 3

Boosts 0

Views 3.2k

Participants 4

I have my app set up with tab navigation using TabView(selection: $selection) to a defaulted view. What I would like to do is set this up so that if a condition is not met, that the user is directed to another view within the tab navigation.

Any suggestions or help will be greatly appreciated!

struct TabNavigationView: View {
@AppStorage("city") var city: String?
@State var selection: String = "Today"

var body: some View {
TabView(selection: $selection) {
ChartView()
.tabItem {
Image(systemName: "star.fill")
.imageScale(.large)
Text("Today")
}

NavigationView {
LocationView()
}
.tabItem {
Image(systemName: "mappin.and.ellipse")
.imageScale(.large)
Text("Location")
}
}
}
}

Answered by mbain108 in 626940022

Thanks to both. I incorporated the enums and populated the tag with them. Then I added logic within onAppear() . It works like a charm!

Boost

Answer 1

OOPer OP

Aug ’20

Please try something like this:

Code Block struct TabNavigationView: View {
		@AppStorage("city") var city: String?
		@State var selection: String = "Location"
		//@Binding var selection: String
		var body: some View {
				TabView(selection: $selection) {
						ChartView()
								.tabItem {
										Image(systemName: "star.fill")
												.imageScale(.large)
										Text("Today")
								}
								.tag("Today") //<-
						NavigationView {
								LocationView()
						}
						.tabItem {
								Image(systemName: "mappin.and.ellipse")
										.imageScale(.large)
								Text("Location")
						}
						.tag("Location") //<-
				}
		}
}

As far as tried, TabView(selection:) works when tag(_:) is specified. You can use @Binding or a Binding to a property of an EnvironmentObject, or any Binding you like, for selection:.

0

Answer 2

knshi OP

Aug ’20

Try with this modifier:

Code Block .onChange(of: selection) { value in 
		if value == condition {
				// do something
		}
}

0

Answer 3

mbain108 OP

Aug ’20

Accepted Answer

Thanks to both. I incorporated the enums and populated the tag with them. Then I added logic within onAppear() . It works like a charm!

0