试图使3列可删除按钮的行，但按钮的第一行不可删除

Question

这篇文章与this相关。在 3 列按钮上制作行后，当点击“删除按钮”时，当点击“垃圾”图像时，前 3 个按钮不可删除。但是，可以删除第二行按钮（即 tag4）。知道这里出了什么问题吗？所有按钮都应该是可删除的。

这是代码

class SomeData: ObservableObject{
    @Published var buttonObjects: [ButtonObject] = [ButtonObject(name: "tag1", isSelected: false),
                                                   ButtonObject(name: "tag2", isSelected: false), ButtonObject(name: "tag3", isSelected: false), ButtonObject(name: "tag4", isSelected: false)]
}

struct someData3: View {
    @Environment(\.editMode) var mode
    @ObservedObject var someData = SomeData()
    @State var newButtonTitle = ""
    @State var isEdit = false

    var body: some View {
        NavigationView{
//            List{ // VStack
                VStack{
//                    Spacer()
                    VStack(alignment: .leading){//
                            ForEach(0..<someData.buttonObjects.count/3+1) { row in // create number of rows
                                HStack{
                                    ForEach(0..<3) { column in // create 3 columns
                                            self.makeView(row: row, column: column)
//                                        makeView2(row: row, column: column, someData: self.someData, isEdit: self.$isEdit)
                                    }
                                }
                            }.id(UUID())
                        }



                    HStack{
                        TextField("Enter new button name", text: $newButtonTitle){
                            let newObject = ButtonObject(name: self.newButtonTitle, isSelected: false)
                            self.someData.buttonObjects.append(newObject)
                            self.newButtonTitle = ""
                        }
                    }

                    Spacer()

                    HStack{
                        Text("isEdit is ")
                        Text(String(self.isEdit))
                        }
                }
                .navigationBarItems(leading: Button(action: {self.isEdit.toggle()}){Text("Delete Button")},
                                 trailing: EditButton())


                }




    }


    func makeView(row: Int, column: Int) -> some View{
        let ind = row * 3 + column
        return Group{
            if ind<self.someData.buttonObjects.count {
                   Button(action: {
                    self.someData.buttonObjects[ind].isSelected = !self.someData.buttonObjects[ind].isSelected
                    print("Button pressed! buttonKeyName is: \(self.someData.buttonObjects[ind].name) Index is \(ind)")
                    print("bool is \(self.someData.buttonObjects[ind].isSelected)")

                   }) {

                    Text(self.someData.buttonObjects[ind].name)

                   }
                   .buttonStyle(GradientBackgroundStyle(isTapped: self.someData.buttonObjects[ind].isSelected))
                    .overlay(Group {
                         if self.isEdit {
                             ZStack {
                                 Button(action: {self.deleteItem(ind: ind)}) {
                                    Image(systemName: "trash")
                                         .foregroundColor(.red).font(.title)
                                 }.padding(.trailing, 3)
                                    .alignmentGuide(.top) { $0[.bottom] }
                             }
                            .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .topTrailing) //topTrailing

                            }
                        }
                    )
                   .padding(.bottom, 20)


            }
            else{
                EmptyView()

            }
        }

    }






    func deleteItem(ind: Int) {
        let name = someData.buttonObjects[ind].name
        print(" deleting ind \(ind), key: \(name)")
        self.someData.buttonObjects.remove(at: ind)
       }


}

Answer 1

您遇到的问题可能是因为顶部按钮的覆盖与NavigationView 标题栏重叠，这将阻止按钮输入。

如果您为VStack 添加一些背景颜色，您会看到顶部按钮的垃圾按钮实际上是在 VStack 之外：

NavigationView {
    VStack {
        ...
    }
    .background(Color.red)
}

其中一种解决方案是通过删除此行将垃圾图像移到更靠近按钮中间的位置：

.alignmentGuide(.top) { $0[.bottom] }

或者，您可以确保您的回收站按钮不会与NavigationView 标题栏重叠。例如，您可以在 VStack 上方添加一个小空间，以使您的垃圾按钮适合其中：

NavigationView {
    VStack {
        Spacer()
            .frame(height: 10)
        VStack {
        ...
    }
}

.padding也可以得到同样的结果：

Button(action: { }) {
    ...
}
.buttonStyle(...)
.overlay(...)
.padding(.top, 20)