FreshScrollView

One day, when I were writing a scrollview with a SwiftUI, I suddenly wanted to add a drop-down refresh to it, but soon found that it was too difficult...

Here is a easy way.

public struct FreshScrollView<Content>: View where Content : View{
 private let content: () -> Content
 private let action: () -> Void
 
 init(@ViewBuilder content: @escaping () -> Content, action: @escaping ()-> Void){
 self.content = content
 self.action = action
 }
 
 @State var startY: Double = 10000
 
 public var body: some View{
 ScrollView{
 GeometryReader{ geometry in
 HStack {
 Spacer()
 if geometry.frame(in: .global) .minY - startY > 30{
 ProgressView()
 .padding(.top, -30)
 .animation(.easeInOut)
 .transition(.move(edge: .top))
 .onAppear{
 let noti = UIImpactFeedbackGenerator(style: .light)
 noti.prepare()
 noti.impactOccurred()
 action()
 }
 }
 Spacer()
 }
 .onAppear {
 startY = geometry.frame(in:.global).minY
 }
 }
 content()
 }
 }
}
#if DEBUG
struct FreshScrollView_Previews: PreviewProvider {
 static var previews: some View {
 FreshScrollView {
 Text("A")
 Text("B")
 Text("C")
 Text("D")
 } action: {
 print("text")
 }
 }
}
#endif