仅当我开始在要拖动的视图顶部拖动时才拖动手势

Question

我希望仅当我开始拖动该视图时才拖动该视图。目前，如果我从屏幕上的任意位置开始拖动，然后在其上拖动，它就会拖动。

import SwiftUI

struct ContentView: View {
    @State private var offset = CGSize.zero
    var body: some View {
        Text("Hello, world!")
            .offset(offset)
            .gesture(
                DragGesture()
                    .onChanged { gesture in
                        offset = gesture.translation
                    }
                    .onEnded { _ in
                        offset = CGSize.zero
                    }
            )
    }
}

Answer 1

这是一个可能的解决方案。在您希望可拖动的视图后面放置一个视图，例如 Color。如果您错过了您真正想要拖动的视图，请在上面放置一个 DragGesture 以捕获拖动。这必须是将显示在屏幕上的视图，否则这不起作用，即您不能使用 Color.clear.

struct ContentView: View {
    @State private var offset = CGSize.zero
    var body: some View {
        ZStack {
            // Place a Color behind your view, set to the background color.
            // It can't be clear as that doesn't work.
            Color.white
                // Place a DragGesture there to capture the drag if not on the view you want
                .gesture(DragGesture())
        Text("Hello, world!")
            .offset(offset)
            .gesture(
                DragGesture()
                    .onChanged { gesture in
                        offset = gesture.translation
                    }
                    .onEnded { _ in
                        offset = CGSize.zero
                    }
            )
        }
    }
}

仅当我开始在要拖动的视图顶部拖动时才拖动手势

Drag gesture only if I start dragging on top of the view that I want to be dragged

swiftui