init(content: (ScrollViewProxy ) -> Content)Creates an instance that can perform programmatic scrolling of its child scroll views.
Overview 概要
The scroll view reader’s content view builder receives a Scroll instance; you use the proxy’s scroll to perform scrolling.
The following example creates a Scroll containing 100 views that together display a color gradient. It also contains two buttons, one each at the top and bottom. The top button tells the Scroll to scroll to the bottom button, and vice versa.
var topID
var bottomID
var body: some View {
ScrollViewReader { proxy in
ScrollView {
Button("Scroll to Bottom") {
withAnimation {
proxy.scrollTo(bottomID)
}
}
.id(topID)
VStack(spacing: 0) {
ForEach(0..<100) { i in
color(fraction: Double(i) / 100)
.frame(height: 32)
}
}
Button("Top") {
withAnimation {
proxy.scrollTo(topID)
}
}
.id(bottomID)
}
}
}
func color(fraction: Double) -> Color {
Color(red: fraction, green: 1 - fraction, blue: 0.5)
}