Repo created

iphone/Maps/Classes/Components/Modal/AlertPresentationController.swift

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+final class AlertPresentationController: DimmedModalPresentationController {
+  override var frameOfPresentedViewInContainerView: CGRect {
+    let f = super.frameOfPresentedViewInContainerView
+    let s = presentedViewController.view.systemLayoutSizeFitting(UIView.layoutFittingCompressedSize)
+    let r = CGRect(x: 0, y: 0, width: s.width, height: s.height)
+    return r.offsetBy(dx: (f.width - r.width) / 2, dy: (f.height - r.height) / 2)
+  }
+
+  override func presentationTransitionWillBegin() {
+    super.presentationTransitionWillBegin()
+    presentedViewController.view.layer.setCornerRadius(.modalSheet)
+    presentedViewController.view.clipsToBounds = true
+    guard let containerView = containerView, let presentedView = presentedView else { return }
+    containerView.addSubview(presentedView)
+    presentedView.center = containerView.center
+    presentedView.frame = frameOfPresentedViewInContainerView
+    presentedView.autoresizingMask = [.flexibleLeftMargin, .flexibleTopMargin, .flexibleRightMargin, .flexibleBottomMargin]
+  }
+
+  override func dismissalTransitionDidEnd(_ completed: Bool) {
+    super.presentationTransitionDidEnd(completed)
+    guard let presentedView = presentedView else { return }
+    if completed {
+      presentedView.removeFromSuperview()
+    }
+  }
+}