base structure for the Your Library view..

YourLibraryView_simple_SpotifySwiftUI.swift

struct YourLibraryView: View {

    @State var page: Int = 0 //// keeps track of which category index we are at
    @State var nestedPages: [Int] = [0, 0] /// keeps track of which sub category index we are at for each category
    @State var indicatorOffsets : [CGFloat] = [0,0] /// keepts track of indicator offsets for each category

    var data = Array(0..<2)
    var nestedData = Array(0..<3)

    var body: some View {
        VStack{
            CategoryText(currentCategoryIndex: self.$page, nestedPages: self.$nestedPages)
            Pager(page: self.$page,
                  data: self.data,
                  id: \.self) { page in
                    self.nestedPager(page)
            }
            .swipeInteractionArea(.allAvailable)
        }
    }

    /// nestedPager contains subcategory titles, an indicator and a pager to show subcategory views
    func nestedPager(_ index: Int) -> some View {
        let currentSubCategory = Binding<Int>(
            get: {
                self.nestedPages[index]
        }, set: { newValue in
            var newNestedPages = self.nestedPages
            newNestedPages[index] = newValue
            self.nestedPages = newNestedPages
        })
        
        let indicatorOffset = Binding<CGFloat>(
            get: {
                self.indicatorOffsets[index]
        }, set: { newValue in
            var newIndicatorOffsets = self.indicatorOffsets
            newIndicatorOffsets[index] = newValue
            self.indicatorOffsets = newIndicatorOffsets
        })

        return VStack(alignment: .leading, spacing: 20){
            SubCategoryText(subCategorys: index == 0 ? ["Playlists", "Albums", "Artists"] : ["Episodes", "Downloads", "Shows"], currentSubCategoryIndex: currentSubCategory, indicatorOffset: indicatorOffset)
            Pager(page: currentSubCategory,
                  data: self.nestedData,
                  id: \.self) { page in
                    MediaContentView()
            }
            Spacer()
        }
    }

}