How to make last index as initial in Hstack scrollview swiftUI - ios

Question

I write the following code and display my days array into Hstack scrollview.
I want to scroll with button actions for that using scrollProxy by using ScrollViewReader
I implemented as follows
when I make a left and right button actions it works as expected
But when I come into screen initially shows the last index but it's not working for me
Anyone gives an idea what the correct place to move the last index.
var body: some View {
ScrollViewReader { scrollProxy in
ZStack{
VStack {
Button(action:{
scrollProxy.scrollTo(selectedDay) //<---- Working
})
.padding(.leading, 10)
Spacer()
ScrollView(.horizontal, showsIndicators: false){
HStack(spacing: 20) {
ForEach(days.indices, id: \.self) { i in
CalendarView(
number: self.days[i].number,
days: self.days[i].weekday,
color: self.days[i].isToday ? #colorLiteral(red: 0.9060331583, green: 0.2547450066, blue: 0.3359550834, alpha: 1) : #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1),
textcolor: self.days[i].isToday ? #colorLiteral(red: 1, green: 1, blue: 1, alpha: 1) : #colorLiteral(red: 0, green: 0, blue: 0, alpha: 1)
)
.onTapGesture{
print(self.days[i])
// this is just for replacing the current selection
for j in self.days.indices { self.days[j].isToday = false }
self.days[i].isToday = true
}
}}
.padding(.leading,10)
.padding(.bottom, 10)
.shadow(radius: 3, x: 3, y: 3)
}
Spacer()
Button(action:{
scrollProxy.scrollTo(selectedDay) //<-- Working
})
.padding(.leading)
Spacer()
}
}
.onAppear {
self.getCurrentWeekdays()
scrollProxy.scrollTo(days.count - 1) //<-- Here it is not Work.
}
}
}