Is there an ActivityIndicator in WatchKit for Apple Watch?

Question

Is there an ActivityIndicator (or something like it) in WatchKit for Apple Watch? How do you all give the user feedback about some longer lasting background activity?

Answer 1

Here is an simple text indicator, which uses a @State attribute:

struct MyView: View {
    private let loaderSpeed = 0.1 // seconds per state
    private let loaderStates = [
        "•       ",
        " •      ",
        "  •     ",
        "   •    ",
        "    •   ",
        "     •  ",
        "      • ",
        "       •",
        "      • ",
        "     •  ",
        "    •   ",
        "   •    ",
        "  •     ",
        " •      ",
    ]
    @State private var loaderMessage = ""
    @State private var loaderState = 0 {
        didSet {
            if self.loaderState > 0 {
                DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + self.loaderSpeed) {
                    if self.loaderState > 0 {
                        self.loaderMessage = self.loaderStates[self.loaderState-1]
                        if self.loaderState >= self.loaderStates.count {
                             self.loaderState = 1
                        } else {
                            self.loaderState += 1
                        }
                    }
                }

            }
        }
    }

    var body: some View {
        HStack() {
            Spacer()
            Text("Loading:")
            Text(loaderMessage).onAppear { self.loaderState = 1 }
            Spacer()
        }
    }
}

set loaderState = 1 to start the loader

set loaderState = 0 to stop the loader