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make code example more generic #1

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Jun 2, 2020
Merged

make code example more generic #1

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32 changes: 21 additions & 11 deletions SwiftUIPullToRefresh/SwiftUIPullToRefresh/ContentView.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -15,12 +15,18 @@ struct Model: Identifiable {

struct ContentView: View {

var modelData = DataModel(modelData: [Model(title: "Item 1"), Model(title: "Item 2"), Model(title: "Item 3")])

var body: some View {
GeometryReader{
geometry in
NavigationView{

CustomScrollView(width: geometry.size.width, height: geometry.size.height)
CustomScrollView(width: geometry.size.width, height: geometry.size.height, handlePullToRefresh: {
self.modelData.addElement()
}) {
SwiftUIList(model: self.modelData)
}
.navigationBarTitle(Text("SwiftUI Pull To Refresh"), displayMode: .inline)

}
Expand Down Expand Up @@ -55,13 +61,14 @@ class DataModel: ObservableObject {
}


struct CustomScrollView : UIViewRepresentable {
struct CustomScrollView<ROOTVIEW>: UIViewRepresentable where ROOTVIEW: View {

var width : CGFloat, height : CGFloat
let modelData = DataModel(modelData: [Model(title: "Item 1"), Model(title: "Item 2"), Model(title: "Item 3")])
let handlePullToRefresh: () -> Void
let rootView: () -> ROOTVIEW

func makeCoordinator() -> Coordinator {
Coordinator(self, model: modelData)
func makeCoordinator() -> Coordinator<ROOTVIEW> {
Coordinator(self, rootView: rootView, handlePullToRefresh: handlePullToRefresh)
}

func makeUIView(context: Context) -> UIScrollView {
Expand All @@ -71,7 +78,7 @@ struct CustomScrollView : UIViewRepresentable {
#selector(Coordinator.handleRefreshControl),
for: .valueChanged)

let childView = UIHostingController(rootView: SwiftUIList(model: modelData))
let childView = UIHostingController(rootView: rootView() )
childView.view.frame = CGRect(x: 0, y: 0, width: width, height: height)

control.addSubview(childView.view)
Expand All @@ -80,19 +87,22 @@ struct CustomScrollView : UIViewRepresentable {

func updateUIView(_ uiView: UIScrollView, context: Context) {}

class Coordinator: NSObject {
class Coordinator<ROOTVIEW>: NSObject where ROOTVIEW: View {
var control: CustomScrollView
var model : DataModel
var handlePullToRefresh: () -> Void
var rootView: () -> ROOTVIEW

init(_ control: CustomScrollView, model: DataModel) {
init(_ control: CustomScrollView, rootView: @escaping () -> ROOTVIEW, handlePullToRefresh: @escaping () -> Void) {
self.control = control
self.model = model
self.handlePullToRefresh = handlePullToRefresh
self.rootView = rootView
}

@objc func handleRefreshControl(sender: UIRefreshControl) {

sender.endRefreshing()
model.addElement()
handlePullToRefresh()

}
}
}
Expand Down