Repo created

iphone/Maps/UI/Search/SearchOnMap/Presentation/ModalPresentationAnimator.swift

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+enum PresentationStepChangeAnimation {
+  case none
+  case slide
+  case slideAndBounce
+}
+
+final class ModalPresentationAnimator {
+
+  private enum Constants {
+    static let animationDuration: TimeInterval = kDefaultAnimationDuration
+    static let springDamping: CGFloat = 0.8
+    static let springVelocity: CGFloat = 0.2
+    static let controlPoint1: CGPoint = CGPoint(x: 0.25, y: 0.1)
+    static let controlPoint2: CGPoint = CGPoint(x: 0.15, y: 1.0)
+  }
+
+  static func animate(with stepAnimation: PresentationStepChangeAnimation = .slide,
+                      animations: @escaping (() -> Void),
+                      completion: ((Bool) -> Void)?) {
+    switch stepAnimation {
+    case .none:
+      animations()
+      completion?(true)
+
+    case .slide:
+      let timing = UICubicTimingParameters(controlPoint1: Constants.controlPoint1,
+                                           controlPoint2: Constants.controlPoint2)
+      let animator = UIViewPropertyAnimator(duration: Constants.animationDuration,
+                                            timingParameters: timing)
+      animator.addAnimations(animations)
+      animator.addCompletion { position in
+        completion?(position == .end)
+      }
+      animator.startAnimation()
+
+    case .slideAndBounce:
+      let velocity = CGVector(dx: Constants.springVelocity, dy: Constants.springVelocity)
+      let timing = UISpringTimingParameters(dampingRatio: Constants.springDamping,
+                                            initialVelocity: velocity)
+      let animator = UIViewPropertyAnimator(duration: Constants.animationDuration,
+                                            timingParameters: timing)
+      animator.addAnimations(animations)
+      animator.addCompletion { position in
+        completion?(position == .end)
+      }
+      animator.startAnimation()
+    }
+  }
+}