Function shared_app 

pub unsafe fn shared_app() -> *mut c_void

[NSApplication sharedApplication], pinned to the light appearance so that rendering does not depend on the host’s system setting.

Safety

AppKit must be loaded and this must run on the main thread, as every NSApplication call must.

Examples found in repository

examples/scenes.rs (line 237)

    unsafe extern "C" fn inspect(_: *mut c_void) {
        unsafe {
            let app = objc::shared_app();

            let windows = objc::send(app, objc::sel(c"windows"));
            let n = count(windows);
            println!("windows: {n}");
            for i in 0..n {
                let w = at(windows, i);
                let title = text(objc::send(w, objc::sel(c"title")));
                let visible = objc::send_ret_bool(w, objc::sel(c"isVisible"));
                let class = objc::send(w, objc::sel(c"class"));
                let kind = text(objc::send(class, objc::sel(c"description")));
                println!("  {kind:<24} visible={visible:<5} {title:?}");
            }

            let menu = objc::send(app, objc::sel(c"mainMenu"));
            let items = objc::send(menu, objc::sel(c"itemArray"));
            let n = count(items);
            println!("menu bar: {n} menus");
            for i in 0..n {
                let item = at(items, i);
                let title = text(objc::send(item, objc::sel(c"title")));
                let sub = objc::send(item, objc::sel(c"submenu"));
                let kids = objc::send(sub, objc::sel(c"itemArray"));
                let entries: Vec<String> = (0..count(kids))
                    .map(|j| text(objc::send(at(kids, j), objc::sel(c"title"))))
                    .filter(|t| !t.is_empty())
                    .collect();
                println!("  {title:?}: {}", entries.join(" · "));
            }

            // The menu-bar extra is an `NSStatusItem`, not a window or a menu,
            // so it is counted separately or it would look like nothing was
            // built for it.
            let bar = objc::class(c"OBJC_CLASS_$_NSStatusBar");
            let system = objc::send(bar, objc::sel(c"systemStatusBar"));
            println!(
                "status bar thickness: {}",
                objc::send_ret_f64(system, objc::sel(c"thickness")),
            );

            std::process::exit(0);
        }
    }