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我在 swiftui 动画中面临挑战。我试图实现顶部滑块仅在显示当前索引元素时进行动画处理，并在此处显示 4 秒的持续时间进行动画处理。

要实现的动画是将顶部的白色层从零填充到单个滑块的全长

当前代码是

struct SliderElement: View {
    @Binding var minWidth: CGFloat
    @Binding var currentRunningIndex: Int
    var elementPosition: Int
    
    private var shouldAnimate: Bool {
        if currentRunningIndex == elementPosition {
            return true
        }
        return false
    }
    
    var body: some View {
        ZStack(alignment:.leading) {
            Capsule()
                .foregroundColor(Color.gray.opacity(0.6))
                .frame(width: 75, height: 4)
            
            if shouldAnimate {
                Capsule()
                    .foregroundColor(Color.white)
                    .frame(width: currentRunningIndex == elementPosition ? minWidth : 75, height: 4)
                    .animation(.easeInOut(duration: 4), value: minWidth)
            }
        }
    }
}

它是从外部容器调用的，它改变了当前

  HStack {
      ForEach(0..<collection.count, id: \.self) { index in
        SliderElement(minWidth: $minWidth, currentRunningIndex: $currentIndex, elementPosition: index)
          }
       }

  func prepareAnimation()  {
     withAnimation {
      minWidth = maxWidth
    }

使用定时器调用prepareAnimation，当前显示的内容也从父容器改变

请帮忙，谢谢

这是当前行为的链接 https://drive.google.com/file/d/1GLPX-x0gpet0M_Og4U1a-QoZxBUzS8zr/view

https://drive.google.com/file/d/1cm6JYguPNYE6xb4AIGMBtFlF6DWTwV6V/view //shouldAnimate 评论

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