SwiftUI: onChange with @Binding from outside view
.onChange is not going to get called cause MainTextView doesn't exist when showingToc = true because of the conditional block:
if showingToc {
TableOfContentsView(onChapterSelected: { chapter in
scrollPosition = chapter
showingToc = false
}
)
} else {
MainTextView(scrollPosition: $scrollPosition)
}
You might want to consider showing TOC as an overlay. But to get your current code working, you need to call proxy.scrollTo in your .onAppear of MainTextView:
.onAppear {
scrollProxy = proxy
scrollProxy?.scrollTo(scrollPosition, anchor: .top)
}