Add customizable drag indicator background color (#62)

* Add ability to customize drag indicator background color

* Add default dragIndicatorBackgroundColor test

* update PR according to comments

CONTRIBUTING.md

@@ -35,7 +35,7 @@ Issues labelled `good first contribution`.
 
 For your contribution to be accepted:
 
-- [x] You must have signed the [Contributor License Agreement (CLA)](https://cla-assistant.io/PanModal).
+- [x] You must have signed the [Contributor License Agreement (CLA)](https://cla-assistant.io/slackHQ/PanModal).
 - [x] The test suite must be complete and pass.
 - [x] The changes must be approved by code review.
 - [x] Commits should be atomic and messages must be descriptive. Related issues should be mentioned by Issue number.

PanModal.podspec

@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'PanModal'
-  s.version          = '1.0.2'
+  s.version          = '1.2.4'
   s.summary          = 'PanModal is an elegant and highly customizable presentation API for constructing bottom sheet modals on iOS.'
 
 # This description is used to generate tags and improve search results.
@@ -25,5 +25,5 @@ Pod::Spec.new do |s|
   s.social_media_url = 'https://twitter.com/slackhq'
   s.ios.deployment_target = '10.0'
   s.swift_version = '4.2'
-  s.source_files = 'PanModal/**/*'
+  s.source_files = 'PanModal/**/*.{swift,h,m}'
 end

PanModal/Animator/PanModalAnimator.swift

@@ -16,18 +16,22 @@ struct PanModalAnimator {
      Constant Animation Properties
      */
     struct Constants {
-        static let transitionDuration: TimeInterval = 0.5
+        static let defaultTransitionDuration: TimeInterval = 0.5
     }
 
     static func animate(_ animations: @escaping PanModalPresentable.AnimationBlockType,
                         config: PanModalPresentable?,
                         _ completion: PanModalPresentable.AnimationCompletionType? = nil) {
 
-        UIView.animate(withDuration: Constants.transitionDuration,
+        let transitionDuration = config?.transitionDuration ?? Constants.defaultTransitionDuration
+        let springDamping = config?.springDamping ?? 1.0
+        let animationOptions = config?.transitionAnimationOptions ?? []
+
+        UIView.animate(withDuration: transitionDuration,
                        delay: 0,
-                       usingSpringWithDamping: config?.springDamping ?? 1.0,
+                       usingSpringWithDamping: springDamping,
                        initialSpringVelocity: 0,
-                       options: [.curveEaseInOut, .allowUserInteraction, .beginFromCurrentState],
+                       options: animationOptions,
                        animations: animations,
                        completion: completion)
     }

PanModal/Animator/PanModalPresentationAnimator.swift

@@ -63,11 +63,16 @@ public class PanModalPresentationAnimator: NSObject {
      */
     private func animatePresentation(transitionContext: UIViewControllerContextTransitioning) {
 
-        guard let toVC = transitionContext.viewController(forKey: .to)
+        guard
+            let toVC = transitionContext.viewController(forKey: .to),
+            let fromVC = transitionContext.viewController(forKey: .from)
             else { return }
 
-        let presentable = toVC as? PanModalPresentable.LayoutType
+        let presentable = panModalLayoutType(from: transitionContext)
 
+        // Calls viewWillAppear and viewWillDisappear
+        fromVC.beginAppearanceTransition(false, animated: true)
+        
         // Presents the view in shortForm position, initially
         let yPos: CGFloat = presentable?.shortFormYPos ?? 0.0
 
@@ -86,6 +91,8 @@ public class PanModalPresentationAnimator: NSObject {
         PanModalAnimator.animate({
             panView.frame.origin.y = yPos
         }, config: presentable) { [weak self] didComplete in
+            // Calls viewDidAppear and viewDidDisappear
+            fromVC.endAppearanceTransition()
             transitionContext.completeTransition(didComplete)
             self?.feedbackGenerator = nil
         }
@@ -96,20 +103,39 @@ public class PanModalPresentationAnimator: NSObject {
      */
     private func animateDismissal(transitionContext: UIViewControllerContextTransitioning) {
 
-        guard let fromVC = transitionContext.viewController(forKey: .from)
+        guard
+            let toVC = transitionContext.viewController(forKey: .to),
+            let fromVC = transitionContext.viewController(forKey: .from)
             else { return }
 
-        let presentable = fromVC as? PanModalPresentable.LayoutType
+        // Calls viewWillAppear and viewWillDisappear
+        toVC.beginAppearanceTransition(true, animated: true)
+        
+        let presentable = panModalLayoutType(from: transitionContext)
         let panView: UIView = transitionContext.containerView.panContainerView ?? fromVC.view
 
         PanModalAnimator.animate({
             panView.frame.origin.y = transitionContext.containerView.frame.height
         }, config: presentable) { didComplete in
             fromVC.view.removeFromSuperview()
+            // Calls viewDidAppear and viewDidDisappear
+            toVC.endAppearanceTransition()
             transitionContext.completeTransition(didComplete)
         }
     }
 
+    /**
+     Extracts the PanModal from the transition context, if it exists
+     */
+    private func panModalLayoutType(from context: UIViewControllerContextTransitioning) -> PanModalPresentable.LayoutType? {
+        switch transitionStyle {
+        case .presentation:
+            return context.viewController(forKey: .to) as? PanModalPresentable.LayoutType
+        case .dismissal:
+            return context.viewController(forKey: .from) as? PanModalPresentable.LayoutType
+        }
+    }
+
 }
 
 // MARK: - UIViewControllerAnimatedTransitioning Delegate
@@ -120,11 +146,17 @@ extension PanModalPresentationAnimator: UIViewControllerAnimatedTransitioning {
      Returns the transition duration
      */
     public func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
-        return PanModalAnimator.Constants.transitionDuration
+
+        guard
+            let context = transitionContext,
+            let presentable = panModalLayoutType(from: context)
+            else { return PanModalAnimator.Constants.defaultTransitionDuration }
+
+        return presentable.transitionDuration
     }
 
     /**
-     Perfroms the appropriate animation based on the transition style
+     Performs the appropriate animation based on the transition style
      */
     public func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
         switch transitionStyle {

PanModal/Controller/PanModalPresentationController.swift

@@ -22,7 +22,7 @@ import UIKit
  By conforming to the PanModalPresentable protocol & overriding values
  the presented view can define its layout configuration & presentation.
  */
-public class PanModalPresentationController: UIPresentationController {
+open class PanModalPresentationController: UIPresentationController {
 
     /**
      Enum representing the possible presentation states
@@ -36,7 +36,6 @@ public class PanModalPresentationController: UIPresentationController {
      Constants
      */
     struct Constants {
-        static let cornerRadius = CGFloat(8.0)
         static let indicatorYOffset = CGFloat(8.0)
         static let snapMovementSensitivity = CGFloat(0.7)
         static let dragIndicatorSize = CGSize(width: 36.0, height: 5.0)
@@ -106,13 +105,15 @@ public class PanModalPresentationController: UIPresentationController {
      */
     private lazy var backgroundView: DimmedView = {
         let view: DimmedView
-        if let alpha = presentable?.backgroundAlpha {
-            view = DimmedView(dimAlpha: alpha)
+        if let color = presentable?.panModalBackgroundColor {
+            view = DimmedView(dimColor: color)
         } else {
             view = DimmedView()
         }
         view.didTap = { [weak self] _ in
-            self?.dismissPresentedViewController()
+            if self?.presentable?.allowsTapToDismiss == true {
+                self?.dismissPresentedViewController()
+            }
         }
         return view
     }()
@@ -132,7 +133,7 @@ public class PanModalPresentationController: UIPresentationController {
      */
     private lazy var dragIndicatorView: UIView = {
         let view = UIView()
-        view.backgroundColor = .lightGray
+        view.backgroundColor = presentable?.dragIndicatorBackgroundColor
         view.layer.cornerRadius = Constants.dragIndicatorSize.height / 2.0
         return view
     }()
@@ -186,6 +187,7 @@ public class PanModalPresentationController: UIPresentationController {
 
         coordinator.animate(alongsideTransition: { [weak self] _ in
             self?.backgroundView.dimState = .max
+            self?.presentedViewController.setNeedsStatusBarAppearanceUpdate()
         })
     }
 
@@ -198,11 +200,12 @@ public class PanModalPresentationController: UIPresentationController {
 
         /**
          Drag indicator is drawn outside of view bounds
-         so hiding it on view dismiss means avoids visual bugs
+         so hiding it on view dismiss means avoiding visual bugs
          */
         coordinator.animate(alongsideTransition: { [weak self] _ in
             self?.dragIndicatorView.alpha = 0.0
             self?.backgroundView.dimState = .off
+            self?.presentingViewController.setNeedsStatusBarAppearanceUpdate()
         })
     }
 
@@ -212,6 +215,25 @@ public class PanModalPresentationController: UIPresentationController {
         backgroundView.removeFromSuperview()
     }
 
+    /**
+     Update presented view size in response to size class changes
+     */
+    override public func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
+        super.viewWillTransition(to: size, with: coordinator)
+
+        coordinator.animate(alongsideTransition: { [weak self] _ in
+            guard
+                let self = self,
+                let presentable = self.presentable
+                else { return }
+
+            self.adjustPresentedViewFrame()
+            if presentable.shouldRoundTopCorners {
+                self.addRoundedCorners(to: self.presentedView)
+            }
+        })
+    }
+
 }
 
 // MARK: - Public Methods
@@ -219,10 +241,10 @@ public class PanModalPresentationController: UIPresentationController {
 public extension PanModalPresentationController {
 
     /**
-     Tranisition the PanModalPresentationController
+     Transition the PanModalPresentationController
      to the given presentation state
      */
-    public func transition(to state: PresentationState) {
+    func transition(to state: PresentationState) {
 
         guard presentable?.shouldTransition(to: state) == true
             else { return }
@@ -238,46 +260,38 @@ public extension PanModalPresentationController {
     }
 
     /**
-     Set the content offset of the scroll view
+     Operations on the scroll view, such as content height changes,
+     or when inserting/deleting rows can cause the pan modal to jump,
+     caused by the pan modal responding to content offset changes.
 
-     Due to content offset observation, its not possible to programmatically
-     set the content offset directly on the scroll view while in the short form.
-
-     This method pauses the content offset KVO, performs the content offset chnage
-     and then resumes content offset observation.
+     To avoid this, you can call this method to perform scroll view updates,
+     with scroll observation temporarily disabled.
      */
-    public func setContentOffset(offset: CGPoint) {
+    func performUpdates(_ updates: () -> Void) {
 
         guard let scrollView = presentable?.panScrollable
             else { return }
 
-        /**
-         Invalidate scroll view observer
-         to prevent its overriding the content offset change
-         */
+        // Pause scroll observer
         scrollObserver?.invalidate()
         scrollObserver = nil
 
-        /**
-         Set scroll view offset & track scrolling
-         */
-        scrollView.setContentOffset(offset, animated:false)
-        trackScrolling(scrollView)
+        // Perform updates
+        updates()
 
-        /**
-         Add the scroll view observer
-         */
+        // Resume scroll observer
+        trackScrolling(scrollView)
         observe(scrollView: scrollView)
     }
 
     /**
      Updates the PanModalPresentationController layout
-     based on values in the PanModalPresentabls
+     based on values in the PanModalPresentable
 
      - Note: This should be called whenever any
      pan modal presentable value changes after the initial presentation
      */
-    public func setNeedsLayoutUpdate() {
+    func setNeedsLayoutUpdate() {
         configureViewLayout()
         adjustPresentedViewFrame()
         observe(scrollView: presentable?.panScrollable)
@@ -341,9 +355,21 @@ private extension PanModalPresentationController {
      Reduce height of presentedView so that it sits at the bottom of the screen
      */
     func adjustPresentedViewFrame() {
-        let frame = containerView?.frame ?? .zero
-        let size = CGSize(width: frame.size.width, height: frame.height - anchoredYPosition)
-        presentedViewController.view.frame = CGRect(origin: .zero, size: size)
+
+        guard let frame = containerView?.frame
+            else { return }
+
+        let adjustedSize = CGSize(width: frame.size.width, height: frame.size.height - anchoredYPosition)
+        let panFrame = panContainerView.frame
+        panContainerView.frame.size = frame.size
+        
+        if ![shortFormYPosition, longFormYPosition].contains(panFrame.origin.y) {
+            // if the container is already in the correct position, no need to adjust positioning
+            // (rotations & size changes cause positioning to be out of sync)
+            adjust(toYPosition: panFrame.origin.y - panFrame.height + frame.height)
+        }
+        panContainerView.frame.origin.x = frame.origin.x
+        presentedViewController.view.frame = CGRect(origin: .zero, size: adjustedSize)
     }
 
     /**
@@ -383,7 +409,7 @@ private extension PanModalPresentationController {
     }
 
     /**
-     Caluclates & stores the layout anchor points & options
+     Calculates & stores the layout anchor points & options
      */
     func configureViewLayout() {
 
@@ -413,7 +439,6 @@ private extension PanModalPresentationController {
          to avoid visual bugs
          */
         scrollView.showsVerticalScrollIndicator = false
-        scrollView.isScrollEnabled = presentable?.isPanScrollEnabled ?? true
         scrollView.scrollIndicatorInsets = presentable?.scrollIndicatorInsets ?? .zero
 
         /**
@@ -443,8 +468,7 @@ private extension PanModalPresentationController {
     @objc func didPanOnPresentedView(_ recognizer: UIPanGestureRecognizer) {
 
         guard
-            presentable?.isPanScrollEnabled == true,
-            !shouldFail(panGestureRecognizer: recognizer),
+            shouldRespond(to: recognizer),
             let containerView = containerView
             else {
                 recognizer.setTranslation(.zero, in: recognizer.view)
@@ -485,7 +509,7 @@ private extension PanModalPresentationController {
                 if velocity.y < 0 {
                     transition(to: .longForm)
 
-                } else if (nearestDistance(to: presentedView.frame.minY, inDistances: [longFormYPosition, containerView.bounds.height]) == longFormYPosition
+                } else if (nearest(to: presentedView.frame.minY, inValues: [longFormYPosition, containerView.bounds.height]) == longFormYPosition
                     && presentedView.frame.minY < shortFormYPosition) || presentable?.allowsDragToDismiss == false {
                     transition(to: .shortForm)
 
@@ -499,7 +523,7 @@ private extension PanModalPresentationController {
                  The `containerView.bounds.height` is used to determine
                  how close the presented view is to the bottom of the screen
                  */
-                let position = nearestDistance(to: presentedView.frame.minY, inDistances: [containerView.bounds.height, shortFormYPosition, longFormYPosition])
+                let position = nearest(to: presentedView.frame.minY, inValues: [containerView.bounds.height, shortFormYPosition, longFormYPosition])
 
                 if position == longFormYPosition {
                     transition(to: .longForm)
@@ -514,6 +538,26 @@ private extension PanModalPresentationController {
         }
     }
 
+    /**
+     Determine if the pan modal should respond to the gesture recognizer.
+
+     If the pan modal is already being dragged & the delegate returns false, ignore until
+     the recognizer is back to it's original state (.began)
+
+     ⚠️ This is the only time we should be cancelling the pan modal gesture recognizer
+     */
+    func shouldRespond(to panGestureRecognizer: UIPanGestureRecognizer) -> Bool {
+        guard
+            presentable?.shouldRespond(to: panGestureRecognizer) == true ||
+                !(panGestureRecognizer.state == .began || panGestureRecognizer.state == .cancelled)
+            else {
+                panGestureRecognizer.isEnabled = false
+                panGestureRecognizer.isEnabled = true
+                return false
+        }
+        return !shouldFail(panGestureRecognizer: panGestureRecognizer)
+    }
+
     /**
      Communicate intentions to presentable and adjust subviews in containerView
      */
@@ -549,7 +593,7 @@ private extension PanModalPresentationController {
          Allow api consumers to override the internal conditions &
          decide if the pan gesture recognizer should be prioritized.
 
-         ⚠️ This is the only time we should be cancelling a recognizer,
+         ⚠️ This is the only time we should be cancelling the panScrollable recognizer,
          for the purpose of ensuring we're no longer tracking the scrollView
          */
         guard !shouldPrioritize(panGestureRecognizer: panGestureRecognizer) else {
@@ -576,7 +620,7 @@ private extension PanModalPresentationController {
      */
     func shouldPrioritize(panGestureRecognizer: UIPanGestureRecognizer) -> Bool {
         return panGestureRecognizer.state == .began &&
-            presentable?.shouldPrioritize(panModalGestureRecognizer: panGestureRecognizer) ?? false
+            presentable?.shouldPrioritize(panModalGestureRecognizer: panGestureRecognizer) == true
     }
 
     /**
@@ -616,16 +660,16 @@ private extension PanModalPresentationController {
     }
 
     /**
-     Finds the nearest distance to a given position out of a given array of distance values
+     Finds the nearest value to a given number out of a given array of float values
 
      - Parameters:
-        - position: reference postion we are trying to find the closest distance to
-        - distances: array of positions we would like to compare against
+        - number: reference float we are trying to find the closest value to
+        - values: array of floats we would like to compare against
      */
-    func nearestDistance(to position: CGFloat, inDistances distances: [CGFloat]) -> CGFloat {
-        guard let nearestDistance = distances.min(by: { abs(position - $0) < abs(position - $1) })
-            else { return position }
-        return nearestDistance
+    func nearest(to number: CGFloat, inValues values: [CGFloat]) -> CGFloat {
+        guard let nearestVal = values.min(by: { abs(number - $0) < abs(number - $1) })
+            else { return number }
+        return nearestVal
     }
 
     /**
@@ -633,7 +677,9 @@ private extension PanModalPresentationController {
      */
     func dismissPresentedViewController() {
         presentable?.panModalWillDismiss()
-        presentedViewController.dismiss(animated: true, completion: nil)
+        presentedViewController.dismiss(animated: true) { [weak self] in
+            self?.presentable?.panModalDidDismiss()
+        }
     }
 }
 
@@ -739,7 +785,7 @@ private extension PanModalPresentationController {
      */
     func handleScrollViewTopBounce(scrollView: UIScrollView, change: NSKeyValueObservedChange<CGPoint>) {
 
-        guard let oldYValue = change.oldValue?.y
+        guard let oldYValue = change.oldValue?.y, scrollView.isDecelerating
             else { return }
 
         let yOffset = scrollView.contentOffset.y
@@ -779,11 +825,11 @@ extension PanModalPresentationController: UIGestureRecognizerDelegate {
     }
 
     /**
-     Allow simultaneous gesture recognizers only when the other gesture recognizer
-     is a pan gesture recognizer
+     Allow simultaneous gesture recognizers only when the other gesture recognizer's view
+     is the pan scrollable view
      */
     public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
-        return otherGestureRecognizer.isKind(of: UIPanGestureRecognizer.self)
+        return otherGestureRecognizer.view == presentable?.panScrollable
     }
 }
 
@@ -797,37 +843,23 @@ private extension PanModalPresentationController {
      because we render the dragIndicator outside of view bounds
      */
     func addRoundedCorners(to view: UIView) {
+        let radius = presentable?.cornerRadius ?? 0
+        let path = UIBezierPath(roundedRect: view.bounds,
+                                byRoundingCorners: [.topLeft, .topRight],
+                                cornerRadii: CGSize(width: radius, height: radius))
 
-        let path = UIBezierPath()
-        path.move(to: CGPoint(x: 0, y: Constants.cornerRadius))
-
-        // 1. Draw left rounded corner
-        path.addArc(withCenter: CGPoint(x: path.currentPoint.x + Constants.cornerRadius, y: path.currentPoint.y),
-                    radius: Constants.cornerRadius, startAngle: .pi, endAngle: 3.0 * .pi/2.0, clockwise: true)
-
-        // 2. Draw around the drag indicator view, if displayed
+        // Draw around the drag indicator view, if displayed
         if presentable?.showDragIndicator == true {
             let indicatorLeftEdgeXPos = view.bounds.width/2.0 - Constants.dragIndicatorSize.width/2.0
             drawAroundDragIndicator(currentPath: path, indicatorLeftEdgeXPos: indicatorLeftEdgeXPos)
         }
 
-        // 3. Draw line to right side of presented view, leaving space to draw rounded corner
-        path.addLine(to: CGPoint(x: view.bounds.width - Constants.cornerRadius, y: path.currentPoint.y))
-
-        // 4. Draw right rounded corner
-        path.addArc(withCenter: CGPoint(x: path.currentPoint.x, y: path.currentPoint.y + Constants.cornerRadius),
-                    radius: Constants.cornerRadius, startAngle: 3.0 * .pi/2.0, endAngle: 0, clockwise: true)
-
-        // 5. Draw around final edges of view
-        path.addLine(to: CGPoint(x: path.currentPoint.x, y: view.bounds.height))
-        path.addLine(to: CGPoint(x: 0, y: path.currentPoint.y))
-
-        // 6. Set path as a mask to display optional drag indicator view & rounded corners
+        // Set path as a mask to display optional drag indicator view & rounded corners
         let mask = CAShapeLayer()
         mask.path = path.cgPath
         view.layer.mask = mask
 
-        // 7. Improve performance by rasterizing the layer
+        // Improve performance by rasterizing the layer
         view.layer.shouldRasterize = true
         view.layer.rasterizationScale = UIScreen.main.scale
     }

PanModal/Delegate/PanModalPresentationDelegate.swift

@@ -73,7 +73,6 @@ extension PanModalPresentationDelegate: UIAdaptivePresentationControllerDelegate
      Dismisses the presented view controller
      */
     public func adaptivePresentationStyle(for controller: UIPresentationController, traitCollection: UITraitCollection) -> UIModalPresentationStyle {
-        controller.presentedViewController.dismiss(animated: false, completion: nil)
         return .none
     }
 

PanModal/Presentable/PanModalHeight.swift

@@ -1,6 +1,6 @@
 //
 //  PanModalHeight.swift
-//  SlackUI
+//  PanModal
 //
 //  Copyright © 2019 Tiny Speck, Inc. All rights reserved.
 //
@@ -35,4 +35,8 @@ public enum PanModalHeight: Equatable {
      */
     case contentHeightIgnoringSafeArea(CGFloat)
 
+    /**
+     Sets the height to be the intrinsic content height
+     */
+    case intrinsicHeight
 }

PanModal/Presentable/PanModalPresentable+Defaults.swift

@@ -2,7 +2,6 @@
 //  PanModalPresentable+Defaults.swift
 //  PanModal
 //
-//  Created by Stephen Sowole on 11/5/18.
 //  Copyright © 2018 Tiny Speck, Inc. All rights reserved.
 //
 
@@ -31,16 +30,32 @@ public extension PanModalPresentable where Self: UIViewController {
         return .contentHeight(scrollView.contentSize.height)
     }
 
+    var cornerRadius: CGFloat {
+        return 8.0
+    }
+
     var springDamping: CGFloat {
         return 0.8
     }
 
-    var backgroundAlpha: CGFloat {
-        return 0.7
+    var transitionDuration: Double {
+        return PanModalAnimator.Constants.defaultTransitionDuration
+    }
+
+    var transitionAnimationOptions: UIView.AnimationOptions {
+        return [.curveEaseInOut, .allowUserInteraction, .beginFromCurrentState]
+    }
+
+    var panModalBackgroundColor: UIColor {
+        return UIColor.black.withAlphaComponent(0.7)
+    }
+
+    var dragIndicatorBackgroundColor: UIColor {
+        return UIColor.lightGray
     }
 
     var scrollIndicatorInsets: UIEdgeInsets {
-        let top = shouldRoundTopCorners ? PanModalPresentationController.Constants.cornerRadius : 0
+        let top = shouldRoundTopCorners ? cornerRadius : 0
         return UIEdgeInsets(top: CGFloat(top), left: 0, bottom: bottomLayoutOffset, right: 0)
     }
 
@@ -61,7 +76,7 @@ public extension PanModalPresentable where Self: UIViewController {
         return true
     }
 
-    var isPanScrollEnabled: Bool {
+    var allowsTapToDismiss: Bool {
         return true
     }
 
@@ -81,7 +96,11 @@ public extension PanModalPresentable where Self: UIViewController {
         return shouldRoundTopCorners
     }
 
-    func willRespond(to panGestureRecognizer: UIPanGestureRecognizer) {
+    func shouldRespond(to panModalGestureRecognizer: UIPanGestureRecognizer) -> Bool {
+        return true
+    }
+
+    func willRespond(to panModalGestureRecognizer: UIPanGestureRecognizer) {
 
     }
 
@@ -101,4 +120,7 @@ public extension PanModalPresentable where Self: UIViewController {
 
     }
 
+    func panModalDidDismiss() {
+
+    }
 }

PanModal/Presentable/PanModalPresentable+LayoutHelpers.swift

@@ -38,7 +38,7 @@ extension PanModalPresentable where Self: UIViewController {
     }
 
     /**
-     Returns the short form Y postion
+     Returns the short form Y position
 
      - Note: If voiceover is on, the `longFormYPos` is returned.
      We do not support short form when voiceover is on as it would make it difficult for user to navigate.
@@ -55,7 +55,7 @@ extension PanModalPresentable where Self: UIViewController {
     }
 
     /**
-     Returns the long form Y postion
+     Returns the long form Y position
 
      - Note: We cap this value to the max possible height
      to ensure content is not rendered outside of the view bounds
@@ -90,6 +90,12 @@ extension PanModalPresentable where Self: UIViewController {
             return bottomYPos - (height + bottomLayoutOffset)
         case .contentHeightIgnoringSafeArea(let height):
             return bottomYPos - height
+        case .intrinsicHeight:
+            view.layoutIfNeeded()
+            let targetSize = CGSize(width: (presentedVC?.containerView?.bounds ?? UIScreen.main.bounds).width,
+                                    height: UIView.layoutFittingCompressedSize.height)
+            let intrinsicHeight = view.systemLayoutSizeFitting(targetSize).height
+            return bottomYPos - (intrinsicHeight + bottomLayoutOffset)
         }
     }
 

PanModal/Presentable/PanModalPresentable+UIViewController.swift

@@ -29,16 +29,6 @@ public extension PanModalPresentable where Self: UIViewController {
         presentedVC?.transition(to: state)
     }
 
-    /**
-     Programmatically set the content offset of the pan scrollable.
-
-     This is required to use while in the short form presentation state,
-     as due to content offset observation, setting the content offset directly would fail
-     */
-    func panModalSetContentOffset(offset: CGPoint) {
-        presentedVC?.setContentOffset(offset: offset)
-    }
-
     /**
      A function wrapper over the `setNeedsLayoutUpdate()`
      function in the PanModalPresentationController.
@@ -49,6 +39,16 @@ public extension PanModalPresentable where Self: UIViewController {
         presentedVC?.setNeedsLayoutUpdate()
     }
 
+    /**
+     Operations on the scroll view, such as content height changes, or when inserting/deleting rows can cause the pan modal to jump,
+     caused by the pan modal responding to content offset changes.
+
+     To avoid this, you can call this method to perform scroll view updates, with scroll observation temporarily disabled.
+     */
+    func panModalPerformUpdates(_ updates: () -> Void) {
+        presentedVC?.performUpdates(updates)
+    }
+
     /**
      A function wrapper over the animate function in PanModalAnimator.
 

PanModal/Presentable/PanModalPresentable.swift

@@ -13,12 +13,12 @@ import UIKit
 
  Usage:
  ```
- extension UIViewController: PanModalPresentable {
+ extension YourViewController: PanModalPresentable {
     func shouldRoundTopCorners: Bool { return false }
  }
  ```
  */
-public protocol PanModalPresentable {
+public protocol PanModalPresentable: AnyObject {
 
     /**
      The scroll view embedded in the view controller.
@@ -54,6 +54,13 @@ public protocol PanModalPresentable {
      */
     var longFormHeight: PanModalHeight { get }
 
+    /**
+     The corner radius used when `shouldRoundTopCorners` is enabled.
+
+     Default Value is 8.0.
+     */
+    var cornerRadius: CGFloat { get }
+
     /**
      The springDamping value used to determine the amount of 'bounce'
      seen when transitioning to short/long form.
@@ -63,13 +70,36 @@ public protocol PanModalPresentable {
     var springDamping: CGFloat { get }
 
     /**
-     The background view alpha.
+     The transitionDuration value is used to set the speed of animation during a transition,
+     including initial presentation.
+
+     Default value is 0.5.
+    */
+    var transitionDuration: Double { get }
+
+    /**
+     The animation options used when performing animations on the PanModal, utilized mostly
+     during a transition.
+
+     Default value is [.curveEaseInOut, .allowUserInteraction, .beginFromCurrentState].
+    */
+    var transitionAnimationOptions: UIView.AnimationOptions { get }
+
+    /**
+     The background view color.
 
      - Note: This is only utilized at the very start of the transition.
 
-     Default Value is 0.7.
-     */
-    var backgroundAlpha: CGFloat { get }
+     Default Value is black with alpha component 0.7.
+    */
+    var panModalBackgroundColor: UIColor { get }
+
+    /**
+     The drag indicator view color.
+
+     Default value is light gray.
+    */
+    var dragIndicatorBackgroundColor: UIColor { get }
 
     /**
      We configure the panScrollable's scrollIndicatorInsets interally so override this value
@@ -91,13 +121,13 @@ public protocol PanModalPresentable {
      A flag to determine if scrolling should seamlessly transition from the pan modal container view to
      the embedded scroll view once the scroll limit has been reached.
 
-     Default value is false.
-     Unless a scrollView is provided and the content exceeds the longForm height
+     Default value is false. Unless a scrollView is provided and the content height exceeds the longForm height.
      */
     var allowsExtendedPanScrolling: Bool { get }
 
     /**
      A flag to determine if dismissal should be initiated when swiping down on the presented view.
+
      Return false to fallback to the short form state instead of dismissing.
 
      Default value is true.
@@ -105,14 +135,11 @@ public protocol PanModalPresentable {
     var allowsDragToDismiss: Bool { get }
 
     /**
-     A flag to determine if scrolling should be enabled on the entire view.
-
-     - Note: Returning false will disable scrolling on the embedded scrollview as well as on the
-     pan modal container view.
+     A flag to determine if dismissal should be initiated when tapping on the dimmed background view.
 
      Default value is true.
      */
-    var isPanScrollEnabled: Bool { get }
+    var allowsTapToDismiss: Bool { get }
 
     /**
      A flag to toggle user interactions on the container view.
@@ -145,6 +172,15 @@ public protocol PanModalPresentable {
      */
     var showDragIndicator: Bool { get }
 
+    /**
+     Asks the delegate if the pan modal should respond to the pan modal gesture recognizer.
+     
+     Return false to disable movement on the pan modal but maintain gestures on the presented view.
+
+     Default value is true.
+     */
+    func shouldRespond(to panModalGestureRecognizer: UIPanGestureRecognizer) -> Bool
+
     /**
      Notifies the delegate when the pan modal gesture recognizer state is either
      `began` or `changed`. This method gives the delegate a chance to prepare
@@ -154,7 +190,7 @@ public protocol PanModalPresentable {
 
      Default value is an empty implementation.
      */
-    func willRespond(to panGestureRecognizer: UIPanGestureRecognizer)
+    func willRespond(to panModalGestureRecognizer: UIPanGestureRecognizer)
 
     /**
      Asks the delegate if the pan modal gesture recognizer should be prioritized.
@@ -162,8 +198,8 @@ public protocol PanModalPresentable {
      For example, you can use this to define a region
      where you would like to restrict where the pan gesture can start.
 
-     If false, then we rely on the internal conditions of when a pan gesture
-     should succeed or fail, such as, if we're actively scrolling on the scrollView
+     If false, then we rely solely on the internal conditions of when a pan gesture
+     should succeed or fail, such as, if we're actively scrolling on the scrollView.
 
      Default return value is false.
      */
@@ -190,4 +226,10 @@ public protocol PanModalPresentable {
      */
     func panModalWillDismiss()
 
+    /**
+     Notifies the delegate after the pan modal is dismissed.
+
+     Default value is an empty implementation.
+     */
+    func panModalDidDismiss()
 }

PanModal/Presenter/PanModalPresenter.swift

@@ -1,6 +1,6 @@
 //
 //  PanModalPresenter.swift
-//  SlackUI
+//  PanModal
 //
 //  Copyright © 2019 Tiny Speck, Inc. All rights reserved.
 //
@@ -17,7 +17,7 @@ import UIKit
                                              sourceRect: .zero)
  ```
  */
-public protocol PanModalPresenter {
+protocol PanModalPresenter: AnyObject {
 
     /**
      A flag that returns true if the current presented view controller

PanModal/Presenter/UIViewController+PanModalPresenter.swift

@@ -1,6 +1,6 @@
 //
 //  UIViewController+PanModalPresenterProtocol.swift
-//  SlackUI
+//  PanModal
 //
 //  Copyright © 2019 Tiny Speck, Inc. All rights reserved.
 //
@@ -50,6 +50,7 @@ extension UIViewController: PanModalPresenter {
             viewControllerToPresent.popoverPresentationController?.delegate = PanModalPresentationDelegate.default
         } else {
             viewControllerToPresent.modalPresentationStyle = .custom
+            viewControllerToPresent.modalPresentationCapturesStatusBarAppearance = true
             viewControllerToPresent.transitioningDelegate = PanModalPresentationDelegate.default
         }
 

PanModal/View/DimmedView.swift

@@ -31,12 +31,11 @@ public class DimmedView: UIView {
         didSet {
             switch dimState {
             case .max:
-                alpha = dimAlpha
+                alpha = 1.0
             case .off:
                 alpha = 0.0
             case .percent(let percentage):
-                let val = max(0.0, min(1.0, percentage))
-                alpha = dimAlpha * val
+                alpha = max(0.0, min(1.0, percentage))
             }
         }
     }
@@ -53,15 +52,12 @@ public class DimmedView: UIView {
         return UITapGestureRecognizer(target: self, action: #selector(didTapView))
     }()
 
-    private let dimAlpha: CGFloat
-
     // MARK: - Initializers
 
-    init(dimAlpha: CGFloat = 0.7) {
-        self.dimAlpha = dimAlpha
+    init(dimColor: UIColor = UIColor.black.withAlphaComponent(0.7)) {
         super.init(frame: .zero)
         alpha = 0.0
-        backgroundColor = .black
+        backgroundColor = dimColor
         addGestureRecognizer(tapGesture)
     }
 

PanModal/View/PanContainerView.swift

@@ -20,8 +20,9 @@ class PanContainerView: UIView {
         addSubview(presentedView)
     }
 
+    @available(*, unavailable)
     required init?(coder aDecoder: NSCoder) {
-        fatalError()
+        fatalError("init(coder:) has not been implemented")
     }
 
 }
@@ -33,7 +34,9 @@ extension UIView {
      from the view hierachy
      */
     var panContainerView: PanContainerView? {
-        return subviews.compactMap({ $0 as? PanContainerView }).first
+        return subviews.first(where: { view -> Bool in
+            view is PanContainerView
+        }) as? PanContainerView
     }
 
 }

PanModalDemo.xcodeproj/project.pbxproj

@@ -41,6 +41,7 @@
 		943904ED2226366700859537 /* AlertViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 943904EC2226366700859537 /* AlertViewController.swift */; };
 		943904EF2226383700859537 /* NavigationController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 943904EE2226383700859537 /* NavigationController.swift */; };
 		943904F32226484F00859537 /* UserGroupStackedViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 943904F22226484F00859537 /* UserGroupStackedViewController.swift */; };
+		944EBA2E227BB7F400C4C97B /* FullScreenNavController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 944EBA2D227BB7F400C4C97B /* FullScreenNavController.swift */; };
 		94795C9B21F0335D008045A0 /* PanModalPresentationDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 94795C9A21F0335D008045A0 /* PanModalPresentationDelegate.swift */; };
 		94795C9D21F03368008045A0 /* PanContainerView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 94795C9C21F03368008045A0 /* PanContainerView.swift */; };
 		DC13905E216D90D5007A3E64 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = DC13905D216D90D5007A3E64 /* Assets.xcassets */; };
@@ -112,6 +113,7 @@
 		943904EC2226366700859537 /* AlertViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AlertViewController.swift; sourceTree = "<group>"; };
 		943904EE2226383700859537 /* NavigationController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NavigationController.swift; sourceTree = "<group>"; };
 		943904F22226484F00859537 /* UserGroupStackedViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = UserGroupStackedViewController.swift; sourceTree = "<group>"; };
+		944EBA2D227BB7F400C4C97B /* FullScreenNavController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FullScreenNavController.swift; sourceTree = "<group>"; };
 		94795C9A21F0335D008045A0 /* PanModalPresentationDelegate.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PanModalPresentationDelegate.swift; sourceTree = "<group>"; };
 		94795C9C21F03368008045A0 /* PanContainerView.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = PanContainerView.swift; sourceTree = "<group>"; };
 		DC13905D216D90D5007A3E64 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
@@ -238,6 +240,22 @@
 			path = Presenter;
 			sourceTree = "<group>";
 		};
+		944EBA2B227BB7D900C4C97B /* Basic */ = {
+			isa = PBXGroup;
+			children = (
+				943904EA2226354100859537 /* BasicViewController.swift */,
+			);
+			path = Basic;
+			sourceTree = "<group>";
+		};
+		944EBA2C227BB7E100C4C97B /* Full Screen */ = {
+			isa = PBXGroup;
+			children = (
+				944EBA2D227BB7F400C4C97B /* FullScreenNavController.swift */,
+			);
+			path = "Full Screen";
+			sourceTree = "<group>";
+		};
 		DC13905F216D93AB007A3E64 /* Resources */ = {
 			isa = PBXGroup;
 			children = (
@@ -310,7 +328,8 @@
 		DC139079216D9AAA007A3E64 /* View Controllers */ = {
 			isa = PBXGroup;
 			children = (
-				943904EA2226354100859537 /* BasicViewController.swift */,
+				944EBA2B227BB7D900C4C97B /* Basic */,
+				944EBA2C227BB7E100C4C97B /* Full Screen */,
 				DC3B2EBB222A5882000C8A4A /* Alert */,
 				DC3B2EBC222A5893000C8A4A /* Alert (Transient) */,
 				743CB2AB222661EA00665A55 /* User Groups (Stacked) */,
@@ -567,6 +586,7 @@
 				DC139075216D9458007A3E64 /* DimmedView.swift in Sources */,
 				743CABD322265F2E00634A5A /* ProfileViewController.swift in Sources */,
 				DC139070216D9458007A3E64 /* PanModalPresentationAnimator.swift in Sources */,
+				944EBA2E227BB7F400C4C97B /* FullScreenNavController.swift in Sources */,
 				DCA741AE216D90410021F2F2 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -661,7 +681,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/PanModal.app/PanModal";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/PanModalDemo.app/PanModalDemo";
 			};
 			name = Debug;
 		};
@@ -681,7 +701,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = "1,2";
-				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/PanModal.app/PanModal";
+				TEST_HOST = "$(BUILT_PRODUCTS_DIR)/PanModalDemo.app/PanModalDemo";
 			};
 			name = Release;
 		};

PanModalDemo.xcodeproj/xcshareddata/xcschemes/PanModalDemo.xcscheme

@@ -28,6 +28,16 @@
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
+         <TestableReference
+            skipped = "NO">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "743CABC32226171500634A5A"
+               BuildableName = "PanModalTests.xctest"
+               BlueprintName = "PanModalTests"
+               ReferencedContainer = "container:PanModalDemo.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
       </Testables>
       <MacroExpansion>
          <BuildableReference

README.md

@@ -1,3 +1,8 @@
+
+### PanModal is an elegant and highly customizable presentation API for constructing bottom sheet modals on iOS.
+
+Read our <a href="https://slack.engineering/panmodal-better-support-for-thumb-accessibility-on-slack-mobile-52b2a7596031" target="_blank">blog</a> on how Slack is getting more :thumbsup: with PanModal
+
 <p align="center">
     <img src="https://github.com/slackhq/PanModal/raw/master/Screenshots/panModal.gif" width="30%" height="30%" alt="Screenshot Preview" />
 </p>

Sample/SampleViewController.swift

@@ -67,6 +67,7 @@ private extension SampleViewController {
 
     enum RowType: Int, CaseIterable {
         case basic
+        case fullScreen
         case alert
         case transientAlert
         case userGroups
@@ -77,6 +78,7 @@ private extension SampleViewController {
         var presentable: RowPresentable {
             switch self {
             case .basic: return Basic()
+            case .fullScreen: return FullScreen()
             case .alert: return Alert()
             case .transientAlert: return TransientAlert()
             case .userGroups: return UserGroup()
@@ -86,33 +88,38 @@ private extension SampleViewController {
         }
 
         struct Basic: RowPresentable {
-            var string: String { return "Basic" }
-            var rowVC: PanModalPresentable.LayoutType { return BasicViewController() }
+            let string: String = "Basic"
+            let rowVC: PanModalPresentable.LayoutType = BasicViewController()
+        }
+
+        struct FullScreen: RowPresentable {
+            let string: String = "Full Screen"
+            let rowVC: PanModalPresentable.LayoutType = FullScreenNavController()
         }
 
         struct Alert: RowPresentable {
-            var string: String { return "Alert" }
-            var rowVC: PanModalPresentable.LayoutType { return AlertViewController() }
+            let string: String = "Alert"
+            let rowVC: PanModalPresentable.LayoutType = AlertViewController()
         }
 
         struct TransientAlert: RowPresentable {
-            var string: String { return "Alert (Transient)"}
-            var rowVC: PanModalPresentable.LayoutType { return TransientAlertViewController() }
+            let string: String = "Alert (Transient)"
+            let rowVC: PanModalPresentable.LayoutType = TransientAlertViewController()
         }
 
         struct UserGroup: RowPresentable {
-            var string: String { return "User Groups" }
-            var rowVC: PanModalPresentable.LayoutType { return UserGroupViewController() }
+            let string: String = "User Groups"
+            let rowVC: PanModalPresentable.LayoutType = UserGroupViewController()
         }
 
         struct Navigation: RowPresentable {
-            var string: String { return "User Groups (NavigationController)" }
-            var rowVC: PanModalPresentable.LayoutType { return NavigationController() }
+            let string: String = "User Groups (NavigationController)"
+            let rowVC: PanModalPresentable.LayoutType = NavigationController()
         }
 
         struct Stacked: RowPresentable {
-            var string: String { return "User Groups (Stacked)" }
-            var rowVC: PanModalPresentable.LayoutType { return UserGroupStackedViewController() }
+            let string: String = "User Groups (Stacked)"
+            let rowVC: PanModalPresentable.LayoutType = UserGroupStackedViewController()
         }
     }
 }

Sample/View Controllers/Alert (Transient)/TransientAlertViewController.swift

@@ -59,8 +59,8 @@ class TransientAlertViewController: AlertViewController {
         return true
     }
 
-    override var backgroundAlpha: CGFloat {
-        return 0.0
+    override var panModalBackgroundColor: UIColor {
+        return .clear
     }
 
     override var isUserInteractionEnabled: Bool {

Sample/View Controllers/Alert/AlertViewController.swift

@@ -46,8 +46,8 @@ class AlertViewController: UIViewController, PanModalPresentable {
         return shortFormHeight
     }
 
-    var backgroundAlpha: CGFloat {
-        return 0.1
+    var panModalBackgroundColor: UIColor {
+        return UIColor.black.withAlphaComponent(0.1)
     }
 
     var shouldRoundTopCorners: Bool {

Sample/View Controllers/Basic/BasicViewController.swift

@@ -18,6 +18,10 @@ class BasicViewController: UIViewController {
 
 extension BasicViewController: PanModalPresentable {
 
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return .lightContent
+    }
+
     var panScrollable: UIScrollView? {
         return nil
     }

Sample/View Controllers/Full Screen/FullScreenNavController.swift

@@ -0,0 +1,73 @@
+//
+//  FullScreenNavController.swift
+//  PanModalDemo
+//
+//  Created by Stephen Sowole on 5/2/19.
+//  Copyright © 2019 Detail. All rights reserved.
+//
+
+import UIKit
+
+class FullScreenNavController: UINavigationController {
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        pushViewController(FullScreenViewController(), animated: false)
+    }
+}
+
+extension FullScreenNavController: PanModalPresentable {
+
+    var panScrollable: UIScrollView? {
+        return nil
+    }
+
+    var topOffset: CGFloat {
+        return 0.0
+    }
+
+    var springDamping: CGFloat {
+        return 1.0
+    }
+
+    var transitionDuration: Double {
+        return 0.4
+    }
+
+    var transitionAnimationOptions: UIView.AnimationOptions {
+        return [.allowUserInteraction, .beginFromCurrentState]
+    }
+
+    var shouldRoundTopCorners: Bool {
+        return false
+    }
+
+    var showDragIndicator: Bool {
+        return false
+    }
+}
+
+private class FullScreenViewController: UIViewController {
+
+    let textLabel: UILabel = {
+        let label = UILabel()
+        label.text = "Drag downwards to dismiss"
+        label.font = UIFont(name: "Lato-Bold", size: 17)
+        label.translatesAutoresizingMaskIntoConstraints = false
+        return label
+    }()
+
+    override func viewDidLoad() {
+        super.viewDidLoad()
+        title = "Full Screen"
+        view.backgroundColor = .white
+        setupConstraints()
+    }
+
+    private func setupConstraints() {
+        view.addSubview(textLabel)
+        textLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
+        textLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
+    }
+
+}

Sample/View Controllers/User Groups (Navigation Controller)/NavigationController.swift

@@ -12,9 +12,17 @@ class NavigationController: UINavigationController, PanModalPresentable {
 
     private let navGroups = NavUserGroups()
 
-    override func viewDidLoad() {
-        super.viewDidLoad()
-        pushViewController(navGroups, animated: false)
+    init() {
+        super.init(nibName: nil, bundle: nil)
+        viewControllers = [navGroups]
+    }
+
+    required init?(coder aDecoder: NSCoder) {
+        fatalError()
+    }
+
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return .lightContent
     }
 
     override func popViewController(animated: Bool) -> UIViewController? {

Sample/View Controllers/User Groups (Stacked)/StackedProfileViewController.swift

@@ -14,6 +14,10 @@ class StackedProfileViewController: UIViewController, PanModalPresentable {
 
     let presentable: UserGroupMemberPresentable
 
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return .lightContent
+    }
+
     // MARK: - Views
 
     let avatarView: UIView = {
@@ -85,6 +89,7 @@ class StackedProfileViewController: UIViewController, PanModalPresentable {
 
         roleLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
         roleLabel.topAnchor.constraint(equalTo: nameLabel.bottomAnchor, constant: 4.0).isActive = true
+        bottomLayoutGuide.topAnchor.constraint(greaterThanOrEqualTo: roleLabel.bottomAnchor).isActive = true
     }
 
     // MARK: - Pan Modal Presentable
@@ -94,7 +99,7 @@ class StackedProfileViewController: UIViewController, PanModalPresentable {
     }
 
     var longFormHeight: PanModalHeight {
-        return .contentHeight(300)
+        return .intrinsicHeight
     }
 
     var anchorModalToLongForm: Bool {

Sample/View Controllers/User Groups/UserGroupViewController.swift

@@ -8,7 +8,7 @@
 
 import UIKit
 
-class UserGroupViewController: UITableViewController, PanModalPresentable, UIGestureRecognizerDelegate {
+class UserGroupViewController: UITableViewController, PanModalPresentable {
 
     let members: [UserGroupMemberPresentable] = [
         UserGroupMemberPresentable(name: "Naida Schill ✈️", role: "Staff Engineer - Mobile DevXP", avatarBackgroundColor: #colorLiteral(red: 0.7215686275, green: 0.9098039216, blue: 0.5607843137, alpha: 1)),
@@ -34,6 +34,10 @@ class UserGroupViewController: UITableViewController, PanModalPresentable, UIGes
 
     var isShortFormEnabled = true
 
+    override var preferredStatusBarStyle: UIStatusBarStyle {
+        return .lightContent
+    }
+
     let headerView = UserGroupHeaderView()
 
     let headerPresentable = UserGroupHeaderPresentable.init(handle: "ios-engs", description: "iOS Engineers", memberCount: 10)

Tests/PanModalTests.swift

@@ -48,17 +48,21 @@ class PanModalTests: XCTestCase {
         XCTAssertEqual(vc.shortFormHeight, PanModalHeight.maxHeight)
         XCTAssertEqual(vc.longFormHeight, PanModalHeight.maxHeight)
         XCTAssertEqual(vc.springDamping, 0.8)
-        XCTAssertEqual(vc.backgroundAlpha, 0.7)
+        XCTAssertEqual(vc.panModalBackgroundColor, UIColor.black.withAlphaComponent(0.7))
+        XCTAssertEqual(vc.dragIndicatorBackgroundColor, UIColor.lightGray)
         XCTAssertEqual(vc.scrollIndicatorInsets, .zero)
         XCTAssertEqual(vc.anchorModalToLongForm, true)
         XCTAssertEqual(vc.allowsExtendedPanScrolling, false)
         XCTAssertEqual(vc.allowsDragToDismiss, true)
-        XCTAssertEqual(vc.isPanScrollEnabled, true)
+        XCTAssertEqual(vc.allowsTapToDismiss, true)
         XCTAssertEqual(vc.isUserInteractionEnabled, true)
         XCTAssertEqual(vc.isHapticFeedbackEnabled, true)
         XCTAssertEqual(vc.shouldRoundTopCorners, false)
         XCTAssertEqual(vc.showDragIndicator, false)
         XCTAssertEqual(vc.shouldRoundTopCorners, false)
+        XCTAssertEqual(vc.cornerRadius, 8.0)
+        XCTAssertEqual(vc.transitionDuration, PanModalAnimator.Constants.defaultTransitionDuration)
+        XCTAssertEqual(vc.transitionAnimationOptions, [.curveEaseInOut, .allowUserInteraction, .beginFromCurrentState])
     }
 
     func testPresentableYValues() {