在SWIFT中缩小地图时MKMapView未进行聚类注记 [英] MKMapView not Clustering Annotation on zooming out map in Swift
本文介绍了在SWIFT中缩小地图时MKMapView未进行聚类注记的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
在复制我的任务之前，请阅读全文。 我在我的应用程序中使用了MkMapKit，现在我必须在缩小地图时显示集群中的人，到目前为止我已经使用this answer实现了对他们的编号，使用的是苹果的默认集群类。现在我不知道如何添加和显示他们所有有计数的圆，我知道一些东西，它应该与半径有关，但我不知道如何才能做到这一点，分享我的代码在下面，我希望任何帮助将不胜感激。谢谢 还显示了我所做的图片：
这是我的UserAnnotationClass
class UserAnnotation: NSObject, MKAnnotation {
let title: String?
let locationName: String
let discipline: String
let coordinate: CLLocationCoordinate2D
let userProfile: UserProfile!
let index: Int!
let memberAnnotations: [UserProfile]!
init(userProfile: UserProfile, at index: Int) {
self.title = userProfile.fullName
self.locationName = (userProfile.locationAddress != nil) ? userProfile.locationAddress : ""
let userProfilePicture: String = (userProfile.profilePicture == nil || userProfile.profilePicture == "") ? "" : userProfile.profilePicture
self.discipline = userProfilePicture
// print("(userProfile.fullName) (userProfile.location.dist)")
if (userProfile.isMapVisibility == true) {
self.coordinate = CLLocationCoordinate2D(latitude: userProfile.location.lat, longitude: userProfile.location.lon)
} else {
self.coordinate = CLLocationCoordinate2D(latitude: 0.0, longitude: 0.0)
}
memberAnnotations = [UserProfile]()
memberAnnotations.append(userProfile)
self.userProfile = userProfile
self.index = index
super.init()
}
var subtitle: String? {
return locationName
}
// pinTintColor for disciplines: Sculpture, Plaque, Mural, Monument, other
var markerTintColor: UIColor {
switch discipline {
case "Monument":
return .red
case "Mural":
return .cyan
case "Plaque":
return .blue
case "Sculpture":
return .purple
default:
return .clear
}
}
// Annotation right callout accessory opens this mapItem in Maps app
func mapItem() -> MKMapItem {
let addressDict = [CNPostalAddressStreetKey: subtitle!]
let placemark = MKPlacemark(coordinate: coordinate, addressDictionary: addressDict)
let mapItem = MKMapItem(placemark: placemark)
mapItem.name = title
return mapItem
}
}
这是我用来对它们进行群集的CLusterViewClass。
class ClusterView: MKAnnotationView {
override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
let hitView = super.hitTest(point, with: event)
if (hitView != nil)
{
if (hitView?.isKind(of: UIButton.self))! {
let sender: UIButton = hitView as! UIButton
sender.sendActions(for: .touchUpInside)
}
else {
self.superview?.bringSubviewToFront(self)
}
}
return hitView
}
override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
let rect = self.bounds
var isInside: Bool = rect.contains(point)
if(!isInside)
{
for view in self.subviews
{
isInside = view.frame.contains(point)
if isInside
{
break
}
}
}
return isInside
}
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
displayPriority = .defaultHigh
collisionMode = .circle
centerOffset = CGPoint(x: 0, y: -10) // Offset center point to animate better with marker annotations
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override var annotation: MKAnnotation? {
willSet {
canShowCallout = false
if let cluster = newValue as? UserAnnotation {
let renderer = UIGraphicsImageRenderer(size: CGSize(width: 40, height: 40))
let count = cluster.memberAnnotations.count
let uniCount = cluster.memberAnnotations.filter { member -> Bool in
//Log("Bool (member) , (member.isMapVisibility == false) 💚")
return member.isMapVisibility == true
}.count
//Log("COUNTS (count) , (uniCount) ❤️")
image = renderer.image { _ in
// Fill full circle with tricycle color
if uniCount > 0 {
AppTheme.blueColor.setFill()
UIBezierPath(ovalIn: CGRect(x: 0, y: 0, width: 40, height: 40)).fill()
// Fill inner circle with white color
UIColor.white.setFill()
UIBezierPath(ovalIn: CGRect(x: 8, y: 8, width: 24, height: 24)).fill()
// Finally draw count text vertically and horizontally centered
let attributes = [ NSAttributedString.Key.foregroundColor: UIColor.black,
NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 20)]
//let text = "(count)"
let text = "4"
let size = text.size(withAttributes: attributes)
let rect = CGRect(x: 20 - size.width / 2, y: 20 - size.height / 2, width: size.width, height: size.height)
text.draw(in: rect, withAttributes: attributes)
}
}
}
}
}
}
这些是我的一些MapKit函数
extension FeedsViewController: MKMapViewDelegate {
// 1
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
guard let annotation = annotation as? UserAnnotation else { return nil }
// 2
let identifier = "marker"
if #available(iOS 11.0, *) {
var view: ClusterView
if let dequeuedView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier)
as? ClusterView { // 3
dequeuedView.annotation = annotation
view = dequeuedView
} else {
// 4
view = ClusterView(annotation: annotation, reuseIdentifier: identifier)
}
return view
} else {
// Fallback on earlier versions
return nil
}
}
func mapView(_ mapView: MKMapView, regionDidChangeAnimated animated: Bool) {
// let zoomWidth = mapView.visibleMapRect.size.width
// let zoomFactor = Int(log2(zoomWidth))
// print("...REGION DID CHANGE: ZOOM FACTOR (zoomFactor)")
let centralLocation = CLLocation(latitude: mapView.centerCoordinate.latitude, longitude: mapView.centerCoordinate.longitude)
Log("💚 Radius - (self.getRadius(centralLocation: centralLocation))")
}
func getRadius(centralLocation: CLLocation) -> Double{
let topCentralLat:Double = centralLocation.coordinate.latitude - mapView.region.span.latitudeDelta/2
let topCentralLocation = CLLocation(latitude: topCentralLat, longitude: centralLocation.coordinate.longitude)
let radius = centralLocation.distance(from: topCentralLocation)
return radius / 1000.0 // to convert radius to meters
}
func mapView(_ mapView: MKMapView,
didSelect view: MKAnnotationView)
{
// 1
if view.annotation is MKUserLocation
{
// Don't proceed with custom callout
return
}
// 2
let annotation = view.annotation as! UserAnnotation
let detailAnnotationView: UserDetailAnnotationView = UserDetailAnnotationView(frame: CGRect(x: 0, y: 0, width: 320, height: 74))
let url = (annotation.discipline == "") ? nil : URL(string: annotation.discipline)!
let range = 0.0..<0.9
if annotation.userProfile.location.dist != nil {
if range.contains(annotation.userProfile.location.dist) {
let kMeters = Measurement(value: annotation.userProfile.location.dist, unit: UnitLength.kilometers)
let meters = kMeters.converted(to: UnitLength.meters)
detailAnnotationView.distancelbl.text = "(String(describing: round(Double(meters.value)))) m Away"
} else {
detailAnnotationView.distancelbl.text = "(String(describing: round(annotation.userProfile.location.dist))) Km Away"
}
}
detailAnnotationView.set(Title: annotation.title!, imageUrl: url) { [weak self] (sender) in
guard let self = self else { return }
if self.isOpenChat {
self.isOpenChat = false
if annotation.userProfile.channel != "" {
self.appDelegate.pubNubAddPushNotifications([annotation.userProfile.channel]) { (status) in
print(status.description)
}
let chatViewController: ChatViewController = self.storyboard?.instantiateViewController(withIdentifier: "ChatViewController") as! ChatViewController
chatViewController.userProfile = annotation.userProfile
chatViewController.loginUserProfile = self.loginUserProfile
self.navigationController?.pushViewController(chatViewController, animated: true)
}
}
}
detailAnnotationView.center = CGPoint(x: view.bounds.size.width / 2, y: -detailAnnotationView.bounds.size.height*0.52)
view.addSubview(detailAnnotationView)
mapView.setCenter((view.annotation?.coordinate)!, animated: true)
// let calloutView = views?[0] as! CustomCalloutView
// calloutView.starbucksName.text = starbucksAnnotation.name
// calloutView.starbucksAddress.text = starbucksAnnotation.address
// calloutView.starbucksPhone.text = starbucksAnnotation.phone
// calloutView.starbucksImage.image = starbucksAnnotation.image
// let button = UIButton(frame: calloutView.starbucksPhone.frame)
// button.addTarget(self, action: #selector(ViewController.callPhoneNumber(sender:)), for: .touchUpInside)
// calloutView.addSubview(button)
// // 3
// calloutView.center = CGPoint(x: view.bounds.size.width / 2, y: -calloutView.bounds.size.height*0.52)
// view.addSubview(calloutView)
// mapView.setCenter((view.annotation?.coordinate)!, animated: true)
}
func mapView(_ mapView: MKMapView, didDeselect view: MKAnnotationView) {
if #available(iOS 11.0, *) {
if view.isKind(of: ClusterView.self)
{
for subview in view.subviews
{
subview.removeFromSuperview()
}
}
} else {
// Fallback on earlier versions
}
}
func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView,
calloutAccessoryControlTapped control: UIControl) {
// let location = view.annotation as! UserAnnotation
// let launchOptions = [MKLaunchOptionsDirectionsModeKey:
// MKLaunchOptionsDirectionsModeDriving]
// location.mapItem().openInMaps(launchOptions: launchOptions)
}
}
这就是我设置mapView的方式...
fileprivate func setupMapsLayout() {
if self.userAnnotationList.count > 0 {
// HereMap
self.mapView.removeAnnotations(self.userAnnotationList)
}
self.mapView.delegate = self
// mapView.register(ArtworkMarkerView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
if #available(iOS 11.0, *) {
// HereMap
//self.mapView.register(UserAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
mapView.register(ClusterView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)
} else {
// Fallback on earlier versions
}
self.loadInitialData()
self.mapView.addAnnotations(self.userAnnotationList)
//self.mapView.topCenterCoordinate()
}
推荐答案
好吧，iOS 11及更高版本的解决方案相当简单。您有两个注释视图，一个用于您自己的注释，另一个用于注释簇。您的主注释视图只需在初始化时和annotation属性更改时指定clusteringIdentifier：
class UserAnnotationView: MKMarkerAnnotationView {
static let preferredClusteringIdentifier = Bundle.main.bundleIdentifier! + ".UserAnnotationView"
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
clusteringIdentifier = UserAnnotationView.preferredClusteringIdentifier
collisionMode = .circle
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override var annotation: MKAnnotation? {
willSet {
clusteringIdentifier = UserAnnotationView.preferredClusteringIdentifier
}
}
}
当annotation属性更新时，您的集群批注视图应该只更新其图像：
class UserClusterAnnotationView: MKAnnotationView {
static let preferredClusteringIdentifier = Bundle.main.bundleIdentifier! + ".UserClusterAnnotationView"
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
collisionMode = .circle
updateImage()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override var annotation: MKAnnotation? { didSet { updateImage() } }
private func updateImage() {
if let clusterAnnotation = annotation as? MKClusterAnnotation {
self.image = image(count: clusterAnnotation.memberAnnotations.count)
} else {
self.image = image(count: 1)
}
}
func image(count: Int) -> UIImage {
let bounds = CGRect(origin: .zero, size: CGSize(width: 40, height: 40))
let renderer = UIGraphicsImageRenderer(bounds: bounds)
return renderer.image { _ in
// Fill full circle with tricycle color
AppTheme.blueColor.setFill()
UIBezierPath(ovalIn: bounds).fill()
// Fill inner circle with white color
UIColor.white.setFill()
UIBezierPath(ovalIn: bounds.insetBy(dx: 8, dy: 8)).fill()
// Finally draw count text vertically and horizontally centered
let attributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.black,
.font: UIFont.boldSystemFont(ofSize: 20)
]
let text = "(count)"
let size = text.size(withAttributes: attributes)
let origin = CGPoint(x: bounds.midX - size.width / 2, y: bounds.midY - size.height / 2)
let rect = CGRect(origin: origin, size: size)
text.draw(in: rect, withAttributes: attributes)
}
}
}
然后，您所要做的就是注册您的类：
mapView.register(UserAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
mapView.register(UserClusterAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)
mapView(_:viewFor:)实现(也不需要)。但上述结果(在您缩小和放大时显示默认动画)：
现在，显然，您可以随心所欲地修改UserAnnotationView。(您的问题没有指出标准的单用户注释视图是什么样子的)。但通过设置clusteringIdentifier并注册MKMapViewDefaultClusterAnnotationViewReuseIdentifier，您可以在iOS 11及更高版本中轻松实现群集。
如果您确实想让集群批注视图看起来像标准批注视图，您可以为两者注册相同的批注视图类：
mapView.register(UserClusterAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultAnnotationViewReuseIdentifier)
mapView.register(UserClusterAnnotationView.self, forAnnotationViewWithReuseIdentifier: MKMapViewDefaultClusterAnnotationViewReuseIdentifier)
但是您必须为集群批注视图提供与我们先前为标准批注视图提供的相同的clusteringIdentifier：
class UserClusterAnnotationView: MKAnnotationView {
static let preferredClusteringIdentifier = Bundle.main.bundleIdentifier! + ".UserClusterAnnotationView"
override init(annotation: MKAnnotation?, reuseIdentifier: String?) {
super.init(annotation: annotation, reuseIdentifier: reuseIdentifier)
clusteringIdentifier = UserClusterAnnotationView.preferredClusteringIdentifier
collisionMode = .circle
updateImage()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override var annotation: MKAnnotation? {
didSet {
clusteringIdentifier = UserClusterAnnotationView.preferredClusteringIdentifier
updateImage()
}
}
private func updateImage() {
if let clusterAnnotation = annotation as? MKClusterAnnotation {
self.image = image(count: clusterAnnotation.memberAnnotations.count)
} else {
self.image = image(count: 1)
}
}
func image(count: Int) -> UIImage {
let bounds = CGRect(origin: .zero, size: CGSize(width: 40, height: 40))
let renderer = UIGraphicsImageRenderer(bounds: bounds)
return renderer.image { _ in
// Fill full circle with tricycle color
AppTheme.blueColor.setFill()
UIBezierPath(ovalIn: bounds).fill()
// Fill inner circle with white color
UIColor.white.setFill()
UIBezierPath(ovalIn: bounds.insetBy(dx: 8, dy: 8)).fill()
// Finally draw count text vertically and horizontally centered
let attributes: [NSAttributedString.Key: Any] = [
.foregroundColor: UIColor.black,
.font: UIFont.boldSystemFont(ofSize: 20)
]
let text = "(count)"
let size = text.size(withAttributes: attributes)
let origin = CGPoint(x: bounds.midX - size.width / 2, y: bounds.midY - size.height / 2)
let rect = CGRect(origin: origin, size: size)
text.draw(in: rect, withAttributes: attributes)
}
}
}
这将产生：
就我个人而言，我认为这有点令人困惑，但如果这就是您要实现的目标，这是实现它的一种方法。
现在，如果您确实需要支持iOS 11之前的版本，并且您想要集群，那么您必须自己做所有这些集群逻辑(或者找第三方库来做)。苹果在WWDC 2011中展示了如何做到这一点Visualizing Information Geographically with MapKit。他们采用的概念是将可见地图划分为网格，如果在特定网格中有多个注释，则删除它们并添加单个"簇"注释。它们说明了您甚至可以如何以可视动画方式将注释移入和移出集群，这样用户就可以在放大和缩小时了解正在发生的事情。这是一个很好的起点，因为您可以深入了解这一点。
这不是微不足道的，所以我会仔细考虑是否要自己实现它。我要么放弃11之前的iOS版本，要么寻找第三方实现(question you reference有很多例子)。
这篇关于在SWIFT中缩小地图时MKMapView未进行聚类注记的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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