Ios 通过拖动更改视图位置的SwiftUI会引发UI错误

Instead of using withAnimation inside the DragGesture().onChanged, try and update the position of the overlay directly. That should give you a smoother drag experience.
And keep the animations for showing and hiding the overlay in the .onEnded part of the gesture.

GraphView(coin: data).frame(height: 300)
    .gesture(DragGesture().onChanged({ value in
        if abs(value.translation.width) > abs(value.translation.height) {
            showPlot = true
            barTranslation = value.location.x
        }
    }).onEnded({ value in
        withAnimation { showPlot = false }
    }).updating($isDrag, body: { value, out, _ in
        out = true
    }))
    .onChange(of: isDrag) { _ in
        if !isDrag {
            withAnimation { showPlot = false }
        }
    }
    .overlay(alignment: .bottomLeading) {
        VStack(spacing: 0){
            Text(currentPlot)
                .font(.caption.bold())
                .foregroundStyle(.gray)
                .padding(.bottom, 35)
                .position(x: barTranslation)
            Rectangle()
                .fill(.gray)
                .frame(width: 1, height: 300)
                .position(x: barTranslation)
            Spacer()
        }
        .opacity(showPlot ? 1 : 0)
    }

这里，覆盖视图(barTranslation)的位置直接在DragGesture().onChanged闭合内更新，而不在withAnimation中包裹它.这一更改确保了随着拖动手势的更改，覆盖的位置会立即更新，这应该会提供更流畅的体验.

.onChanged({ value in
    if abs(value.translation.width) > abs(value.translation.height) {
        showPlot = true
        barTranslation = value.location.x
    }
})

动画现在只应用于手势的.onEnded部分.这确保动画仅用于在拖动手势开始和结束时显示和隐藏覆盖，而不是try 在拖动过程中设置位置更改的动画.

.onEnded({ value in
    withAnimation { showPlot = false }
})

即使在删除With动画时，该错误仍会发生.而且，警告仍然打印了很多.

Make sure the gesture state is managed correctly. Sometimes, improper handling of gesture states can lead to unexpected behaviors. You might want to explicitly manage the state of the drag gesture.
The placement of animation modifiers can have unforeseen effects. Try removing any global or implicit animations applied to the parent view that might be affecting the overlay's behavior.
Redundant or conflicting updates to state variables like showPlot and barTranslation can cause issues.

该警告消息指示可动画值存在问题.调试这些值以查看它们是否以意外的方式更新.可能position(x: barTranslation)接收的值无效或不符合预期.

有时，与使用.position(x:)相比，使用.offset(x:)表示移动视图可以提供更流畅的动画和更新..offset修改器将视图从其原始位置移动，这样可以更有效.

您可以try 使用.offset修改.overlay部分:

.overlay(alignment: .bottomLeading) {
    VStack(spacing: 0){
        Text(currentPlot)
            .font(.caption.bold())
            .foregroundStyle(.gray)
            .padding(.bottom, 35)
            .offset(x: barTranslation - initialPosition)
        Rectangle()
            .fill(.gray)
            .frame(width: 1, height: 300)
            .offset(x: barTranslation - initialPosition)
        Spacer()
    }
    .opacity(showPlot ? 1 : 0)
}

initialPosition表示覆盖视图的初始位置.这一更改确保barTranslation相对于其原始位置更新视图的位置.

如果这些方法仍然无法解决问题，则可能需要查看整个视图层次 struct 以及手势如何与SwiftUI视图的其他部分交互.