[Banner] setNeedsLayout before showing Banner in BannerAutolayoutSwif…

…tExampleViewController

PiperOrigin-RevId: 348569490

components/Banner/examples/BannerAutolayoutSwiftExampleViewController.swift

@@ -13,11 +13,10 @@
 // limitations under the License.
 
 import UIKit
-
 import MaterialComponents.MaterialBanner
-import MaterialComponents.MaterialBanner_Theming
+import MaterialComponents.MaterialBanner_Theming 
 import MaterialComponents.MaterialButtons
-import MaterialComponents.MaterialButtons_Theming
+import MaterialComponents.MaterialButtons_Theming 
 import MaterialComponents.MaterialColorScheme
 import MaterialComponents.MaterialContainerScheme
 
@@ -33,7 +32,8 @@ class BannerAutoLayoutSwiftExampleViewController: UIViewController {
     showBannerButton.translatesAutoresizingMaskIntoConstraints = false
     showBannerButton.applyTextTheme(withScheme: containerScheme)
     showBannerButton.setTitle("Material Banner", for: .normal)
-    showBannerButton.addTarget(self, action: #selector(self.didTapShowBannerButton), for: .touchUpInside)
+    showBannerButton.addTarget(
+      self, action: #selector(self.didTapShowBannerButton), for: .touchUpInside)
     view.addSubview(showBannerButton)
     showBannerButton.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
     showBannerButton.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
@@ -45,7 +45,8 @@ class BannerAutoLayoutSwiftExampleViewController: UIViewController {
     bannerView.layoutMargins = .zero
     let actionButton = bannerView.leadingButton
     actionButton.setTitle("Dismiss", for: .normal)
-    actionButton.addTarget(self, action: #selector(self.didTapDismissOnBannerView), for: .touchUpInside)
+    actionButton.addTarget(
+      self, action: #selector(self.didTapDismissOnBannerView), for: .touchUpInside)
     bannerView.applyTheme(withScheme: containerScheme)
     view.addSubview(bannerView)
     bannerView.isHidden = true
@@ -60,7 +61,8 @@ class BannerAutoLayoutSwiftExampleViewController: UIViewController {
 
   @objc func didTapShowBannerButton() {
     bannerView.isHidden = false
-    UIAccessibility.post(notification:.layoutChanged, argument: bannerView);
+    bannerView.setNeedsLayout()
+    UIAccessibility.post(notification: .layoutChanged, argument: bannerView)
   }
 
   @objc func didTapDismissOnBannerView() {