SwiftUI on macOS - handle single-click and double-click at the same time

问题

Consider this view in SwiftUI:

struct MyView: View {
    var body: some View {
        Rectangle()
            .fill(Color.blue)
            .frame(width: 200, height: 200)
            .onTapGesture {
                print("single clicked")
            }
    }
}

Now we're handling single-click. Say you wanna handle double-click too, but with a separate callback.

You have 2 options:

• Add double click handler after single click - this doesn't work at all
• Add double click handler before single click handler, this kinda works:

struct MyView: View {
    var body: some View {
        Rectangle()
            .fill(Color.blue)
            .frame(width: 200, height: 200)
            .onTapGesture(count: 2) {
                print("double clicked")
            }
            .onTapGesture {
                print("single clicked")
            }
    }
}

Double-click handler is called properly, but single-click handler is called after a delay of about 250ms.

Any ideas how to resolve this?

回答1:

Here is possible approach (tested with Xcode 11.2 / macOS 10.15)

struct MyView: View {
    var body: some View {
        Rectangle()
            .fill(Color.blue)
            .frame(width: 200, height: 200)
            .gesture(TapGesture(count: 2).onEnded {
                print("double clicked")
            })
            .simultaneousGesture(TapGesture().onEnded {
                print("single clicked")
            })
    }
}

来源：https://stackoverflow.com/questions/59992089/swiftui-on-macos-handle-single-click-and-double-click-at-the-same-time