ios - 如何从SwiftUI中的struct返回值？

Question

我根据以下视频制作了RangeSlider:https://www.youtube.com/watch?v=5whzc_9eR78。它工作正常，但是我想从中获取左右值，我该怎么做？

我的代码:

struct RangeSlider: View {

    @State var width: CGFloat = 0
    @State var width1: CGFloat = 20
    @State var totalWidth: CGFloat = UIScreen.main.bounds.width-60

    let circleSize: CGFloat = 21

    var body: some View {
        VStack{
            ZStack(alignment: .leading){
                Rectangle()
                    .fill(Color.black.opacity(0.2))
                    .frame(width: self.totalWidth+2*self.circleSize, height: self.circleSize/3)

                Rectangle()
                    .fill(Color.black)
                    .frame(width: self.width1-self.width, height: self.circleSize/3)
                    .offset(x: self.width+self.circleSize)

                HStack(spacing: 0){
                    Circle()
                        .fill(Color.white)
                        .frame(width: self.circleSize, height: self.circleSize)
                        .offset(x: self.width)
                        .gesture(
                            DragGesture()
                                .onChanged({ (value) in
                                    if (value.location.x >= 0 && value.location.x <= self.width1){

                                        self.width = value.location.x

                                    }
                                }))

                    Circle()
                        .fill(Color.white)
                        .frame(width: self.circleSize, height: self.circleSize)
                        .offset(x: self.width1)
                        .gesture(
                            DragGesture()
                                .onChanged({ (value) in
                                    if (value.location.x <= self.totalWidth-(2*self.circleSize) && value.location.x >= self.width){

                                        self.width1 = value.location.x

                                    }
                                }))
                }

            }
        }
    }
}

我正在ContentView.swift的ZStack中调用 RangeSlider()，我想返回左拇指值 width/totalWidth和右拇指值 width1/totalWidth，就像在Textfield(text:self。$ value)中完成的操作一样，将文本返回到变量“值”。

Answer 1

加

@Binding var left: CGFloat
@Binding var right: CGFloat

然后在 width和 width1更改时进行设置。构造RangeSlider时，您需要传递Bindings: RangeSlider(left: $left, right: $right)