SwiftUI Menus

Links

• https://stackoverflow.com/questions/57241409/is-there-a-way-to-open-a-contextmenu-in-swiftui-with-a-normal-touch
• https://stackoverflow.com/questions/69822148/how-to-show-menu-programmatically-in-swiftui
• https://stackoverflow.com/questions/56513339/is-there-a-way-to-create-a-dropdown-menu-button-in-swiftui
• https://developer.apple.com/documentation/swiftui/contextmenu
• https://developer.apple.com/forums/thread/664419

Examples

Menu {
    Button {
        style = 0
    } label: {
        Text("Linear")
        Image(systemName: "arrow.down.right.circle")
    }
    Button {
        style = 1
    } label: {
        Text("Radial")
        Image(systemName: "arrow.up.and.down.circle")
    }
} label: {
     Text("Style")
     Image(systemName: "tag.circle")
}

GroupBox {
    DisclosureGroup("Menu 1") {
        Text("Item 1")
        Text("Item 2")
        Text("Item 3")
    }
}

you might consider the Picker:

struct ContentView : View {
    @State private var selection = 1
    var body: some View {
        VStack {
            Picker(selection: $selection, label: Text("Zeige Deteils")) {
                Text("Schmelzpunkt").tag(1)
                Text("Instrumentelle Analytik").tag(2)
            }
        }
    }
}

          Text("Options")
           .contextMenu {
               Button(action: {
                   // change country setting
               }) {
                   Text("Choose Country")
               }

               Button(action: {
                   // enable geolocation
               }) {
                   Text("Detect Location")
               }
           }

From - https://www.hackingwithswift.com/quick-start/swiftui/how-to-show-a-context-menu

Dropdowns

You need to use an overlay to display your dropdown. Otherwise, parents' layout will be wrong when you show and hide the dropdown.

demo

Here is a simple answer, and the complete answer could be found here

struct Dropdown: View {
    var options: [DropdownOption]
    var onSelect: ((_ key: String) -> Void)?

    var body: some View {
        VStack(alignment: .leading, spacing: 0) {
            ForEach(self.options, id: \.self) { option in
                DropdownOptionElement(val: option.val, key: option.key, onSelect: self.onSelect)
            }
        }

        .background(Color.white)
        .cornerRadius(dropdownCornerRadius)
        .overlay(
            RoundedRectangle(cornerRadius: dropdownCornerRadius)
                .stroke(Color.coreUIPrimary, lineWidth: 1)
        )
    }
}

struct DropdownButton: View {
    @State var shouldShowDropdown = false
    @Binding var displayText: String
    var options: [DropdownOption]
    var onSelect: ((_ key: String) -> Void)?

    let buttonHeight: CGFloat = 30
    var body: some View {
        Button(action: {
            self.shouldShowDropdown.toggle()
        }) {
            HStack {
                Text(displayText)
                Spacer()
                    .frame(width: 20)
                Image(systemName: self.shouldShowDropdown ? "chevron.up" : "chevron.down")
            }
        }
        .padding(.horizontal)
        .cornerRadius(dropdownCornerRadius)
        .frame(height: self.buttonHeight)
        .overlay(
            RoundedRectangle(cornerRadius: dropdownCornerRadius)
                .stroke(Color.coreUIPrimary, lineWidth: 1)
        )
        .overlay(
            VStack {
                if self.shouldShowDropdown {
                    Spacer(minLength: buttonHeight + 10)
                    Dropdown(options: self.options, onSelect: self.onSelect)
                }
            }, alignment: .topLeading
        )
        .background(
            RoundedRectangle(cornerRadius: dropdownCornerRadius).fill(Color.white)
        )
    }
}