Struct ScrollProxy 

pub struct ScrollProxy { /* private fields */ }

The ScrollViewProxy a scroll_view_reader’s closure is handed.

An owned copy, not a borrow, because that is how SwiftUI means it to be used:

ScrollViewReader { proxy in
    Button("go") { proxy.scrollTo(10) }   // captured, used later
}

Calling scroll_to during the build instead traps — ScrollViewProxy may not be accessed during view updates, which is SwiftUI’s own check and was measured by doing it. So the proxy has to outlive the closure, and a borrow would not let it.

ScrollViewProxy is resilient, so it reaches the closure by address and its size is not something a caller may assume: the bytes are copied through its own value witness rather than read as a word. It happens to be eight POD bytes today, which is exactly the kind of fact a resilient type is allowed to change.

Implementations

impl ScrollProxy

pub fn scroll_to(&self, id: i64)

proxy.scrollTo(id) — bring the view with that .id(_:) into view.

Int ids only, which is what ForEach(0..<n) and .id(i) produce. A String id would need its own Hashable witness passed, and nothing in this crate produces one yet.

pub fn scroll_to_anchor(&self, id: i64, anchor: (f64, f64))

proxy.scrollTo(id, anchor: UnitPoint(x:y:)).

Trait Implementations

impl Clone for ScrollProxy

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Drop for ScrollProxy

fn drop(&mut self)

Executes the destructor for this type.

fn pin_drop(self: Pin<&mut Self>)

🔬This is a nightly-only experimental API. (pin_ergonomics)

Execute the destructor for this type, but different to Drop::drop, it requires self to be pinned.