Share Sheet UIActivityViewController within SwiftUI

Sharing

Available on my personal blog as well.

With Growrilla 1.5.0 released, users can now share their progress more easily.

Thus I also want to share how I did it.

First, we have the make the `UIActivityViewController` usable with SwiftUI. Thus we are going to wrap it around a `UIViewControllerRepresentable`.

struct ActivityViewController: UIViewControllerRepresentable {
@Binding var activityItems: [Any]
    var excludedActivityTypes: [UIActivity.ActivityType]? = nil
    
    func makeUIViewController(context: UIViewControllerRepresentableContext<ActivityViewController>) -> UIActivityViewController {
        let controller = UIActivityViewController(activityItems: activityItems,
                                                  applicationActivities: nil)
        
        controller.excludedActivityTypes = excludedActivityTypes
        
        return controller
    }
func updateUIViewController(_ uiViewController: UIActivityViewController, context: UIViewControllerRepresentableContext<ActivityViewController>) {}
}

Then we create a custom `ViewModifer` to more easily views more easily implement the sharing feature.

struct ShareSheetModifer: ViewModifier {
    @State private var showShareSheet: Bool = false
    @State var shareSheetItems: [Any] = []
    
    func body(content: Content) -> some View {
        content
            .contextMenu {
                Button(action: {
                    self.showShareSheet.toggle()
                }) {
                    Text("Share")
                    Image(systemName: "square.and.arrow.up")
                }
            }
            .sheet(isPresented: $showShareSheet, content: {
                ActivityViewController(activityItems: self.$shareSheetItems)
            })
    }
}

Within my example, I’m creating this sharing feature with a context menu, but you can easily change it to being a double tap for example with `onTapGesture`.

Then to use it, add the modifier to your SwiftUI Element like the following with the items that you want to share.

Text("Hello, world!")
            .padding()
            .modifier(ShareSheetModifer(shareSheetItems: ["Hello, world!"]))

While this is already okay to use, I personally don’t like to write my modifiers in this way. Thus, you can use the following extension on View.

extension View {
    func shareSheet(items: [Any], excludedActivityTypes: [UIActivity.ActivityType]? = nil) -> some View {
        self.modifier(ShareSheetModifer(shareSheetItems: items))
    }
}

Then you use it the following way:

Text("Hello, world!")
            .padding()
            .shareSheet(items: ["Hello world!"])

If you want to exclude activity types like for example posting the items to Facebook, you use it the following way:

Text("Hello, world!")
                .padding()
                .shareSheet(items: ["Hello world!"], excludedActivityTypes: [.postToFacebook])

Hope you enjoyed it!

For the full code snippet:
https://gist.github.com/hoyelam/04f4d476f6f987ac81ec67cbf5cbc6e7