How can I mimic the bottom sheet from the Maps app

Question

Can anyone tell me how I can mimic the bottom sheet in the new Maps app in iOS 10    In Android  you can use a BottomSheet which mimics this behaviour  but I could not find anything like that for iOS    Is that a simple scroll view with a content inset  so that the search bar is at the bottom    I am fairly new to iOS programming so if someone could help me creating this layout  that would be highly appreciated   This is what I mean by  bottom sheet

User · Answer

I recently created a component called SwipeableView as subclass of UIView  written in Swift 5 1   It support all 4 direction  has several customisation options and can animate and interpolate different attributes and items   such as layout constraints  background tint color  affine transform  alpha channel and view center  all of them demoed with the respective show case    It also supports the swiping coordination with the inner scroll view if set or auto detected  Should be pretty easy and straightforward to be used   I hope    Link at https   github com LucaIaco SwipeableView  proof of concept     Hope it helps

User · Answer

Maybe you can try my answer https   github com AnYuan AYPannel  inspired by Pulley  Smooth transition from moving the drawer to scrolling the list  I added a pan gesture on the container scroll view  and set shouldRecognizeSimultaneouslyWithGestureRecognizer to return YES  More detail in my github link above  Wish to help

User · Answer

I don t know how exactly the bottom sheet of the new Maps app  responds to user interactions  But you can create a custom view that looks like the one in the screenshots and add it to the main view   I assume you know how to   1- create view controllers either by storyboards or using xib files   2- use googleMaps or Apple s MapKit   Example  1- Create 2 view controllers e g  MapViewController and BottomSheetViewController  The first controller will host the map and the second is the bottom sheet itself   Configure MapViewController  Create a method to add the bottom sheet view   func addBottomSheetView            1- Init bottomSheetVC     let bottomSheetVC   BottomSheetViewController           2- Add bottomSheetVC as a child view      self addChildViewController bottomSheetVC      self view addSubview bottomSheetVC view      bottomSheetVC didMoveToParentViewController self          3- Adjust bottomSheet frame and initial position      let height   view frame height     let width    view frame width     bottomSheetVC view frame   CGRectMake 0  self view frame maxY  width  height      And call it in viewDidAppear method   override func viewDidAppear animated  Bool        super viewDidAppear animated      addBottomSheetView       Configure BottomSheetViewController  1  Prepare background  Create a method to add blur and vibrancy effects  func prepareBackgroundView        let blurEffect   UIBlurEffect init style   Dark      let visualEffect   UIVisualEffectView init effect  blurEffect      let bluredView   UIVisualEffectView init effect  blurEffect      bluredView contentView addSubview visualEffect       visualEffect frame   UIScreen mainScreen   bounds     bluredView frame   UIScreen mainScreen   bounds      view insertSubview bluredView  atIndex  0      call this method in your viewWillAppear  override func viewWillAppear animated  Bool       super viewWillAppear animated     prepareBackgroundView       Make sure that your controller s view background color is clearColor   2  Animate bottomSheet appearance  override func viewDidAppear animated  Bool        super viewDidAppear animated       UIView animateWithDuration 0 3     weak self  in         let frame   self  view frame         let yComponent   UIScreen mainScreen   bounds height - 200         self  view frame   CGRectMake 0  yComponent  frame  width  frame  height            3  Modify your xib as you want   4  Add Pan Gesture Recognizer to your view   In your viewDidLoad method add UIPanGestureRecognizer   override func viewDidLoad         super viewDidLoad        let gesture   UIPanGestureRecognizer init target  self  action   selector BottomSheetViewController panGesture       view addGestureRecognizer gesture       And implement your gesture behaviour   func panGesture recognizer  UIPanGestureRecognizer        let translation   recognizer translationInView self view      let y   self view frame minY     self view frame   CGRectMake 0  y   translation y  view frame width  view frame height       recognizer setTranslation CGPointZero  inView  self view      Scrollable Bottom Sheet   If your custom view is a scroll view or any other view that inherits from  so you have two options   First   Design the view with a header view and add the panGesture to the header   bad user experience    Second   1 - Add the panGesture to the bottom sheet view   2 - Implement the UIGestureRecognizerDelegate and set the panGesture delegate to the controller   3- Implement shouldRecognizeSimultaneouslyWith delegate function and disable the scrollView isScrollEnabled property in two case    The view is partially visible  The view is totally visible  the scrollView contentOffset property is 0 and the user is dragging the view downwards    Otherwise enable scrolling     func gestureRecognizer   gestureRecognizer  UIGestureRecognizer  shouldRecognizeSimultaneouslyWith otherGestureRecognizer  UIGestureRecognizer  - gt  Bool         let gesture    gestureRecognizer as  UIPanGestureRecognizer        let direction   gesture velocity in  view  y        let y   view frame minY       if  y    fullView  amp  amp  tableView contentOffset y    0  amp  amp  direction  gt  0      y    partialView              tableView isScrollEnabled   false         else           tableView isScrollEnabled   true                return false       NOTE  In case you set  allowUserInteraction as an animation option  like in the sample project  so you need to enable scrolling on the animation completion closure if the user is scrolling up   Sample Project  I created a sample project with more options on this repo which may give you better insights about how to customise the flow   In the demo  addBottomSheetView   function controls which view should be used as a bottom sheet   Sample Project Screenshots  - Partial View    - FullView    - Scrollable View

User · Answer

Try Pulley      Pulley is an easy to use drawer library meant to imitate the drawer   in iOS 10 s Maps app  It exposes a simple API that allows you to use   any UIViewController subclass as the drawer content or the primary   content      https   github com 52inc Pulley

User · Answer

I wrote my own library to achieve the intended behaviour in ios Maps app  It is a protocol oriented solution  So you don t need to inherit any base class instead create a sheet controller and configure as you wish  It also supports inner navigation presentation with or without UINavigationController    See below link for more details   https   github com OfTheWolf UBottomSheet

User · Answer

You can try my answer https   github com SCENEE FloatingPanel  It provides a container view controller to display a  bottom sheet  interface    It s easy to use and you don t mind any gesture recognizer handling  Also you can track a scroll view s or the sibling view  in a bottom sheet if needed   This is a simple example  Please note that you need to prepare a view controller to display your content in a bottom sheet   import UIKit import FloatingPanel  class ViewController  UIViewController       var fpc  FloatingPanelController       override func viewDidLoad             super viewDidLoad            fpc   FloatingPanelController               Add  bottom sheet  in self view          fpc add toParent  self              Add a view controller to display your contents in  bottom sheet           let contentVC   ContentViewController           fpc set contentViewController  contentVC              Track a scroll view in  bottom sheet  content if needed          fpc track scrollView  contentVC tableView                        Here is another example code to display a bottom sheet to search a location like Apple Maps

User · Answer

If you are looking for a SwiftUI 2 0 solution that uses View Struct  here it is  https   github com kenfai KavSoft-Tutorials-iOS tree main MapsBottomSheet

User · Answer

I released a library based on my answer below  It mimics the Shortcuts application overlay  See this article for details  The main component of the library is the OverlayContainerViewController  It defines an area where a view controller can be dragged up and down  hiding or revealing the content underneath it  let contentController   MapsViewController   let overlayController   SearchViewController    let containerController   OverlayContainerViewController   containerController delegate   self containerController viewControllers         contentController      overlayController    window  rootViewController   containerController  Implement OverlayContainerViewControllerDelegate to specify the number of notches wished  enum OverlayNotch  Int  CaseIterable       case minimum  medium  maximum    func numberOfNotches in containerViewController  OverlayContainerViewController  - gt  Int       return OverlayNotch allCases count    func overlayContainerViewController   containerViewController  OverlayContainerViewController                                      heightForNotchAt index  Int                                      availableSpace  CGFloat  - gt  CGFloat       switch OverlayNotch allCases index            case  maximum              return availableSpace   3   4         case  medium              return availableSpace   2         case  minimum              return availableSpace   1   4          SwiftUI  12 29 20  A SwiftUI version of the library is now available  Color red dynamicOverlay Color green    Previous answer I think there is a significant point that is not treated in the suggested solutions  the transition between the scroll and the translation   In Maps  as you may have noticed  when the tableView reaches contentOffset y    0  the bottom sheet either slides up or goes down  The point is tricky because we can not simply enable disable the scroll when our pan gesture begins the translation  It would stop the scroll until a new touch begins  This is the case in most of the proposed solutions here  Here is my try to implement this motion  Starting point  Maps App To start our investigation  let s visualize the view hierarchy of Maps  start Maps on a simulator and select Debug  gt  Attach to process by PID or Name  gt  Maps in Xcode 9    It doesn t tell how the motion works  but it helped me to understand the logic of it  You can play with the lldb and the view hierarchy debugger  Our view controller stacks Let s create a basic version of the Maps ViewController architecture  We start with a BackgroundViewController  our map view   class BackgroundViewController  UIViewController       override func loadView             view   MKMapView            We put the tableView in a dedicated UIViewController  class OverlayViewController  UIViewController  UITableViewDataSource  UITableViewDelegate        lazy var tableView   UITableView        override func loadView             view   tableView         tableView dataSource   self         tableView delegate   self                     Now  we need a VC to embed the overlay and manage its translation  To simplify the problem  we consider that it can translate the overlay from one static point OverlayPosition maximum to another OverlayPosition minimum  For now it only has one public method to animate the position change and it has a transparent view  enum OverlayPosition       case maximum  minimum    class OverlayContainerViewController  UIViewController        let overlayViewController  OverlayViewController     var translatedViewHeightContraint            override func loadView             view   UIView              func moveOverlay to position  OverlayPosition                           Finally we need a ViewController to embed the all  class StackViewController  UIViewController        private var viewControllers   UIViewController       override func viewDidLoad             super viewDidLoad           viewControllers forEach   gz addChild  0  in  view             In our AppDelegate  our startup sequence looks like  let overlay   OverlayViewController   let containerViewController   OverlayContainerViewController overlayViewController  overlay  let backgroundViewController   BackgroundViewController   window  rootViewController   StackViewController viewControllers   backgroundViewController  containerViewController    The difficulty behind the overlay translation Now  how to translate our overlay  Most of the proposed solutions use a dedicated pan gesture recognizer  but we actually already have one   the pan gesture of the table view  Moreover  we need to keep the scroll and the translation synchronised and the UIScrollViewDelegate has all the events we need  A naive implementation would use a second pan Gesture and try to reset the contentOffset of the table view when the translation occurs  func panGestureAction   recognizer  UIPanGestureRecognizer        if isTranslating           tableView contentOffset    zero          But it does not work  The tableView updates its contentOffset when its own pan gesture recognizer action triggers or when its displayLink callback is called  There is no chance that our recognizer triggers right after those to successfully override the contentOffset  Our only chance is either to take part of the layout phase  by overriding layoutSubviews of the scroll view calls at each frame of the scroll view  or to respond to the didScroll method of the delegate called each time the contentOffset is modified  Let s try this one  The translation Implementation We add a delegate to our OverlayVC to dispatch the scrollview s events to our translation handler  the OverlayContainerViewController   protocol OverlayViewControllerDelegate  class       func scrollViewDidScroll   scrollView  UIScrollView      func scrollViewDidStopScrolling   scrollView  UIScrollView     class OverlayViewController  UIViewController                   func scrollViewDidScroll   scrollView  UIScrollView            delegate  scrollViewDidScroll scrollView             func scrollViewDidEndDragging   scrollView  UIScrollView  willDecelerate decelerate  Bool            delegate  scrollViewDidStopScrolling scrollView           In our container  we keep track of the translation using a enum  enum OverlayInFlightPosition       case minimum     case maximum     case progressing    The current position calculation looks like   private var overlayInFlightPosition  OverlayInFlightPosition       let height   translatedViewHeightContraint constant     if height    maximumHeight           return  maximum       else if height    minimumHeight           return  minimum       else           return  progressing          We need 3 methods to handle the translation  The first one tells us if we need to start the translation  private func shouldTranslateView following scrollView  UIScrollView  - gt  Bool       guard scrollView isTracking else   return false       let offset   scrollView contentOffset y     switch overlayInFlightPosition       case  maximum          return offset  lt  0     case  minimum          return offset  gt  0     case  progressing          return true          The second one performs the translation  It uses the translation in   method of the scrollView s pan gesture  private func translateView following scrollView  UIScrollView        scrollView contentOffset    zero     let translation   translatedViewTargetHeight - scrollView panGestureRecognizer translation in  view  y     translatedViewHeightContraint constant   max          Constant minimumHeight          min translation  Constant maximumHeight           The third one animates the end of the translation when the user releases its finger  We calculate the position using the velocity  amp  the current position of the view  private func animateTranslationEnd         let position  OverlayPosition           calculation based on the current overlay position  amp  velocity     moveOverlay to  position     Our overlay s delegate implementation simply looks like   class OverlayContainerViewController  UIViewController        func scrollViewDidScroll   scrollView  UIScrollView            guard shouldTranslateView following  scrollView  else   return           translateView following  scrollView             func scrollViewDidStopScrolling   scrollView  UIScrollView               prevent scroll animation when the translation animation ends         scrollView isEnabled   false         scrollView isEnabled   true         animateTranslationEnd            Final problem  dispatching the overlay container s touches The translation is now pretty efficient  But there is still a final problem  the touches are not delivered to our background view  They are all intercepted by the overlay container s view  We can not set isUserInteractionEnabled to false because it would also disable the interaction in our table view  The solution is the one used massively in the Maps app  PassThroughView  class PassThroughView  UIView       override func hitTest   point  CGPoint  with event  UIEvent   - gt  UIView            let view   super hitTest point  with  event          if view    self               return nil                   return view          It removes itself from the responder chain  In OverlayContainerViewController  override func loadView         view   PassThroughView      Result Here is the result   You can find the code here  Please if you see any bugs  let me know   Note that your implementation can of course use a second pan gesture  specially if you add a header in your overlay  Update 23 08 18 We can replace scrollViewDidEndDragging with willEndScrollingWithVelocity rather than enabling disabling the scroll when the user ends dragging  func scrollView   scrollView  UIScrollView                  willEndScrollingWithVelocity velocity  CGPoint                  targetContentOffset  UnsafeMutablePointer lt CGPoint gt         switch overlayInFlightPosition       case  maximum          break     case  minimum   progressing          targetContentOffset pointee    zero           animateTranslationEnd following  scrollView     We can use a spring animation and allow user interaction while animating  to make the motion flow better  func moveOverlay to position  OverlayPosition                   duration  TimeInterval                   velocity  CGPoint        overlayPosition   position     translatedViewHeightContraint constant   translatedViewTargetHeight     UIView animate          withDuration  duration          delay  0          usingSpringWithDamping  velocity y    0   1   0 6          initialSpringVelocity  abs velocity y           options    allowUserInteraction           animations                self view layoutIfNeeded          completion  nil

[ios] How can I mimic the bottom sheet from the Maps app?

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