Method update

packages/core/ui/action-bar/index.ios.ts:215–309

()

	}

	public update(): void {
		const page = this.page;
		// Page should be attached to frame to update the action bar.
		if (!page || !page.frame) {
			return;
		}

		const viewController = <UIViewController>page.ios;
		// visionOS may init with different nav stack setup
		if (!viewController) {
			return;
		}
		const navigationItem: UINavigationItem = viewController.navigationItem;
		const navController = <UINavigationController>viewController.navigationController;

		if (!navController) {
			return;
		}

		const navigationBar = navController.navigationBar;
		let previousController: UIViewController;

		// Set Title
		navigationItem.title = this.title;
		const titleView = this.titleView;
		if (titleView && titleView.ios) {
			navigationItem.titleView = titleView.ios;
		} else {
			navigationItem.titleView = null;
		}

		// Find previous ViewController in the navigation stack
		const indexOfViewController = navController.viewControllers.indexOfObject(viewController);
		if (indexOfViewController > 0 && indexOfViewController < navController.viewControllers.count) {
			previousController = navController.viewControllers[indexOfViewController - 1];
		}

		// Set back button text
		if (previousController) {
			if (this.navigationButton) {
				const tapHandler = TapBarItemHandlerImpl.initWithOwner(new WeakRef(this.navigationButton));
				const barButtonItem = UIBarButtonItem.alloc().initWithTitleStyleTargetAction(this.navigationButton.text + '', UIBarButtonItemStyle.Plain, tapHandler, 'tap');
				previousController.navigationItem.backBarButtonItem = barButtonItem;
			} else {
				previousController.navigationItem.backBarButtonItem = null;
			}
		}

		// Set back button image
		let img: UIImage;
		if (this.navigationButton && isVisible(this.navigationButton) && this.navigationButton.icon) {
			img = loadActionIcon(this.navigationButton);
		}

		// TODO: This could cause issue when canceling BackEdge gesture - we will change the backIndicator to
		// show the one from the old page but the new page will still be visible (because we canceled EdgeBackSwipe gesutre)
		// Consider moving this to new method and call it from - navigationControllerDidShowViewControllerAnimated.
		const image = img ? img.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal) : null;