MapKit框架详细解析（十八） —— 基于MapKit使用Indoor Maps来绘制建筑物内部的地图的简单示例（二）

版本记录

版本号	时间
V1.0	2020.10.12 星期一

前言

MapKit框架直接从您的应用界面显示地图或卫星图像，调出兴趣点，并确定地图坐标的地标信息。接下来几篇我们就一起看一下这个框架。感兴趣的看下面几篇文章。
1. MapKit框架详细解析（一） —— 基本概览（一）
2. MapKit框架详细解析（二） —— 基本使用简单示例（一）
3. MapKit框架详细解析（三） —— 基本使用简单示例（二）
4. MapKit框架详细解析（四） —— 一个叠加视图相关的简单示例（一）
5. MapKit框架详细解析（五） —— 一个叠加视图相关的简单示例（二）
6. MapKit框架详细解析（六） —— 添加自定义图块（一）
7. MapKit框架详细解析（七） —— 添加自定义图块（二）
8. MapKit框架详细解析（八） —— 添加自定义图块（三）
9. MapKit框架详细解析（九） —— 地图特定区域放大和创建自定义地图annotations（一）
10. MapKit框架详细解析（十） —— 地图特定区域放大和创建自定义地图annotations（二）
11. MapKit框架详细解析（十一） —— 自定义MapKit Tiles（一）
12. MapKit框架详细解析（十二） —— 自定义MapKit Tiles（二）
13. MapKit框架详细解析（十三） —— MapKit Overlay Views（一）
14. MapKit框架详细解析（十四） —— MapKit Overlay Views（二）
15. MapKit框架详细解析（十五） —— 基于MapKit和Core Location的Routing（一）
16. MapKit框架详细解析（十六） —— 基于MapKit和Core Location的Routing（二）
17. MapKit框架详细解析（十七） —— 基于MapKit使用Indoor Maps来绘制建筑物内部的地图的简单示例（一）

源码

1. Swift

首先看下工程组织结构

下面就是sb中的内容

接着就是源码了

1. LabelAnnotation.swift

import MapKit
import UIKit

class LabelAnnotation: MKAnnotationView {
  var label: UILabel
  var point: UIView

  override var annotation: MKAnnotation? {
    didSet {
      if let title = annotation?.title {
        label.text = title
      } else {
        label.text = nil
      }
    }
  }

  override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
    label = UILabel(frame: .zero)
    point = UIView(frame: .zero)
    super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)

    label.font = UIFont.preferredFont(forTextStyle: .caption1)
    addSubview(label)

    label.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      label.leadingAnchor.constraint(equalTo: leadingAnchor),
      label.trailingAnchor.constraint(equalTo: trailingAnchor),
      label.bottomAnchor.constraint(equalTo: bottomAnchor)
    ])

    let radius: CGFloat = 5.0
    point.layer.cornerRadius = radius
    point.layer.borderWidth = 1.0
    point.layer.borderColor = UIColor(named: "AnnotationBorder")?.cgColor
    addSubview(point)

    point.translatesAutoresizingMaskIntoConstraints = false
    NSLayoutConstraint.activate([
      point.widthAnchor.constraint(equalToConstant: radius * 2),
      point.heightAnchor.constraint(equalToConstant: radius * 2),
      point.topAnchor.constraint(equalTo: topAnchor),
      point.centerXAnchor.constraint(equalTo: label.centerXAnchor),
      point.bottomAnchor.constraint(equalTo: label.topAnchor)
    ])

    centerOffset = CGPoint(x: 0, y: label.font.lineHeight / 2 )
    calloutOffset = CGPoint(x: 0, y: -radius)
    canShowCallout = true
    translatesAutoresizingMaskIntoConstraints = false
  }

  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  override var backgroundColor: UIColor? {
    get {
      return point.backgroundColor
    }
    set {
      point.backgroundColor = newValue
    }
  }
}

2. PointAnnotation.swift

import Foundation
import MapKit

class PointAnnotation: MKAnnotationView {
  override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
    super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)

    frame = CGRect(x: frame.origin.x, y: frame.origin.y, width: 10, height: 10)
    layer.cornerRadius = 5
    layer.borderWidth = 1.0
    layer.borderColor = UIColor(named: "AnnotationBorder")?.cgColor
    canShowCallout = true
  }

  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }
}

3. IMDFError.swift

import Foundation

enum IMDFError: Error {
  case invalidType
  case invalidData
}

4. Archive.swift

import Foundation

struct Archive {
  let directory: URL

  init(directory: URL) {
    self.directory = directory
  }

  enum File {
    case address
    case amenity
    case anchor
    case building
    case detail
    case fixture
    case footprint
    case geofence
    case kiosk
    case level
    case manifest
    case occupant
    case opening
    case relationship
    case section
    case unit
    case venue

    var filename: String {
      return "\(self).geojson"
    }
  }

  func fileURL(for file: File) -> URL {
    return directory.appendingPathComponent(file.filename)
  }
}

5. IMDFDecoder.swift

import Foundation
import MapKit

class IMDFDecoder {
  private let geoJSONDecoder = MKGeoJSONDecoder()
  func decode(_ imdfDirectory: URL) throws -> Venue {
    let archive = Archive(directory: imdfDirectory)

    // Decode all the features that need to be rendered.
    let venues = try decodeFeatures(Venue.self, from: .venue, in: archive)
    let levels = try decodeFeatures(Level.self, from: .level, in: archive)
    let units = try decodeFeatures(Unit.self, from: .unit, in: archive)
    let openings = try decodeFeatures(Opening.self, from: .opening, in: archive)
    let amenities = try decodeFeatures(Amenity.self, from: .amenity, in: archive)

    // Associate levels to venues.
    if venues.isEmpty {
      throw IMDFError.invalidData
    }
    let venue = venues[0]
    venue.levelsByOrdinal = Dictionary(grouping: levels) { level in
      level.properties.ordinal
    }

    // Associate Units and Opening to levels.
    let unitsByLevel = Dictionary(grouping: units) { unit in
      unit.properties.levelId
    }

    let openingsByLevel = Dictionary(grouping: openings) { opening in
      opening.properties.levelId
    }

    // Associate each Level with its corresponding Units and Openings.
    for level in levels {
      if let unitsInLevel = unitsByLevel[level.id] {
        level.units = unitsInLevel
      }
      if let openingsInLevel = openingsByLevel[level.id] {
        level.openings = openingsInLevel
      }
    }

    // Associate Amenities to the Unit in which they reside.
    let unitsById = units.reduce(into: [UUID: Unit]()) {
      $0[$1.id] = $1
    }

    for amenity in amenities {
      guard let pointGeometry = amenity.geometry[0] as? MKPointAnnotation else {
        throw IMDFError.invalidData
      }

      if let name = amenity.properties.name?.bestLocalizedValue {
        amenity.title = name
        amenity.subtitle = amenity.properties.category.capitalized
      } else {
        amenity.title = amenity.properties.category.capitalized
      }

      for unitID in amenity.properties.unitIds {
        let unit = unitsById[unitID]
        unit?.amenities.append(amenity)
      }

      amenity.coordinate = pointGeometry.coordinate
    }

    // Occupants (and certain other IMDF features) do not directly contain geometry. Instead, they reference a separate `Anchor` which
    // contains geometry. Occupants should be associated with Units.
    try decodeOccupants(units: units, in: archive)

    return venue
  }

  private func decodeOccupants(units: [Unit], in archive: Archive) throws {
    let occupants = try decodeFeatures(Occupant.self, from: .occupant, in: archive)
    let anchors = try decodeFeatures(Anchor.self, from: .anchor, in: archive)
    let unitsById = units.reduce(into: [UUID: Unit]()) {
      $0[$1.id] = $1
    }
    let anchorsById = anchors.reduce(into: [UUID: Anchor]()) {
      $0[$1.id] = $1
    }

    // Resolve the occupants location based on the referenced Anchor, and associate them
    // with their corresponding Unit.
    for occupant in occupants {
      guard let anchor = anchorsById[occupant.properties.anchorId] else {
        throw IMDFError.invalidData
      }

      guard let pointGeometry = anchor.geometry[0] as? MKPointAnnotation else {
        throw IMDFError.invalidData
      }
      occupant.coordinate = pointGeometry.coordinate

      if let name = occupant.properties.name.bestLocalizedValue {
        occupant.title = name
        occupant.subtitle = occupant.properties.category.capitalized
      } else {
        occupant.title = occupant.properties.category.capitalized
      }

      guard let unit = unitsById[anchor.properties.unitId] else {
        continue
      }

      // Associate occupants to units.
      unit.occupants.append(occupant)
      occupant.unit = unit
    }
  }

  private func decodeFeatures(_ type: T.Type, from file: Archive.File, in archive: Archive) throws -> [T] {
    let fileURL = archive.fileURL(for: file)
    let data = try Data(contentsOf: fileURL)
    let geoJSONFeatures = try geoJSONDecoder.decode(data)
    guard let features = geoJSONFeatures as? [MKGeoJSONFeature] else {
      throw IMDFError.invalidType
    }

    let imdfFeatures = try features.map { try type.init(feature: $0) }
    return imdfFeatures
  }
}

6. StylableFeatures.swift

import Foundation
import MapKit

protocol StylableFeature {
  var geometry: [MKShape & MKGeoJSONObject] { get }
  func configure(overlayRenderer: MKOverlayPathRenderer)
  func configure(annotationView: MKAnnotationView)
}

extension StylableFeature {
  func configure(overlayRenderer: MKOverlayPathRenderer) {}
  func configure(annotationView: MKAnnotationView) {}
}

7. MapViewController.swift

import UIKit
import MapKit

class MapViewController: UIViewController {
  @IBOutlet weak var mapView: MKMapView!

  let locationManager = CLLocationManager()
  let decoder = IMDFDecoder()
  var venue: Venue?

  private var levels: [Level] = []
  private var currentLevelFeatures: [StylableFeature] = []
  private var currentLevelOverlays: [MKOverlay] = []
  private var currentLevelAnnotations: [MKAnnotation] = []

  override func viewDidLoad() {
    super.viewDidLoad()
    setupMapView()
    loadRazeHQIndoorMapData()
    showDefaultMapRect()
    showFeatures(for: 1)
    startListeningForLocation()
  }

  func setupMapView() {
    mapView.delegate = self
    mapView.register(PointAnnotation.self, forAnnotationViewWithReuseIdentifier: "PointAnnotationView")
    mapView.register(LabelAnnotation.self, forAnnotationViewWithReuseIdentifier: "LabelAnnotationView")
    mapView.pointOfInterestFilter = .none
  }

  func loadRazeHQIndoorMapData() {
    guard let resourceURL = Bundle.main.resourceURL else { return }

    let imdfDirectory = resourceURL.appendingPathComponent("Data")
    do {
      venue = try decoder.decode(imdfDirectory)
    } catch let error {
      print(error)
    }
  }

  private func showFeatures(for ordinal: Int) {
    guard venue != nil else {
      return
    }

    // 1
    currentLevelFeatures.removeAll()
    mapView.removeOverlays(currentLevelOverlays)
    mapView.removeAnnotations(currentLevelAnnotations)
    currentLevelAnnotations.removeAll()
    currentLevelOverlays.removeAll()

    // 2
    if let levels = venue?.levelsByOrdinal[ordinal] {
      for level in levels {
        currentLevelFeatures.append(level)
        currentLevelFeatures += level.units
        currentLevelFeatures += level.openings

        let occupants = level.units.flatMap { unit in
          unit.occupants
        }

        let amenities = level.units.flatMap { unit in
          unit.amenities
        }

        currentLevelAnnotations += occupants
        currentLevelAnnotations += amenities
      }
    }

    // 3
    let currentLevelGeometry = currentLevelFeatures.flatMap { feature in
      feature.geometry
    }

    currentLevelOverlays = currentLevelGeometry.compactMap { mkOverlay in
      mkOverlay as? MKOverlay
    }

    mapView.addOverlays(currentLevelOverlays)
    mapView.addAnnotations(currentLevelAnnotations)
  }

  func showDefaultMapRect() {
    guard
      let venue = venue,
      let venueOverlay = venue.geometry[0] as? MKOverlay
      else { return }

    mapView.setVisibleMapRect(
      venueOverlay.boundingMapRect,
      edgePadding: UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20),
      animated: false)
  }

  func startListeningForLocation() {
    locationManager.requestWhenInUseAuthorization()
  }

  @IBAction func segmentedControlValueChanged(_ sender: UISegmentedControl) {
    showFeatures(for: sender.selectedSegmentIndex)
  }
}

// MARK: - MKMapViewDelegate

extension MapViewController: MKMapViewDelegate {
  func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
    guard
      let shape = overlay as? (MKShape & MKGeoJSONObject),
      let feature = currentLevelFeatures.first( where: { $0.geometry.contains( where: { $0 == shape }) })
      else { return MKOverlayRenderer(overlay: overlay) }

    let renderer: MKOverlayPathRenderer
    switch overlay {
    case is MKMultiPolygon:
      renderer = MKMultiPolygonRenderer(overlay: overlay)
    case is MKPolygon:
      renderer = MKPolygonRenderer(overlay: overlay)
    case is MKMultiPolyline:
      renderer = MKMultiPolylineRenderer(overlay: overlay)
    case is MKPolyline:
      renderer = MKPolylineRenderer(overlay: overlay)
    default:
      return MKOverlayRenderer(overlay: overlay)
    }

    // Configure the overlay renderer's display properties in feature-specific ways.
    feature.configure(overlayRenderer: renderer)

    return renderer
  }

  func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
    if let stylableFeature = annotation as? StylableFeature {
      if stylableFeature is Occupant {
        let annotationView = mapView.dequeueReusableAnnotationView(
          withIdentifier: "LabelAnnotationView",
          for: annotation)
        stylableFeature.configure(annotationView: annotationView)
        return annotationView
      } else {
        let annotationView = mapView.dequeueReusableAnnotationView(
          withIdentifier: "PointAnnotationView",
          for: annotation)
        stylableFeature.configure(annotationView: annotationView)
        return annotationView
      }
    }

    return nil
  }

  func mapView(_ mapView: MKMapView, didUpdate userLocation: MKUserLocation) {
    guard
      let venue = venue,
      let location = userLocation.location
      else { return }

    // Display location only if the user is inside this venue.
    var isUserInsideVenue = false
    let userMapPoint = MKMapPoint(location.coordinate)
    for geometry in venue.geometry {
      guard let overlay = geometry as? MKOverlay else {
        continue
      }

      if overlay.boundingMapRect.contains(userMapPoint) {
        isUserInsideVenue = true
        break
      }
    }

    guard isUserInsideVenue else {
      return
    }

    // If the device knows which level the user is physically on, automatically switch to that level.
    if let ordinal = location.floor?.level {
      showFeatures(for: ordinal)
    }
  }
}

后记

本篇主要讲述了基于MapKit使用Indoor Maps来绘制建筑物内部的地图的简单示例，感兴趣的给个赞或者关注~~~