Swift 缩小时,注释将隐藏
这是我的问题: 当缩小且property showsUserLocation设置为true且注释以用户位置为中心时,集群将在缩小时消失。我不想这样,它们应该总是可见的。displayPriority的默认值设置为required,因此我不确定如何修复此问题每个注释和簇都应该始终可见。当我将属性showsUserLocation设置为false,或者确保注释/簇不在当前位置附近时,它会起作用 有两种方法可以重现我的问题:Swift 缩小时,注释将隐藏,swift,mapkit,Swift,Mapkit,这是我的问题: 当缩小且property showsUserLocation设置为true且注释以用户位置为中心时,集群将在缩小时消失。我不想这样,它们应该总是可见的。displayPriority的默认值设置为required,因此我不确定如何修复此问题每个注释和簇都应该始终可见。当我将属性showsUserLocation设置为false,或者确保注释/簇不在当前位置附近时,它会起作用 有两种方法可以重现我的问题: 克隆并运行 复制粘贴并运行下面的代码 代码 import UIKit im
import UIKit
import MapKit
class ViewController: UIViewController, MKMapViewDelegate, CLLocationManagerDelegate {
let mapView = MKMapView(frame: .zero)
private let locationManager = CLLocationManager()
override func viewDidLoad() {
view.addSubview(mapView)
mapView.translatesAutoresizingMaskIntoConstraints = false
mapView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
mapView.heightAnchor.constraint(equalTo: view.heightAnchor).isActive = true
mapView.centerYAnchor.constraint(equalTo: view.centerYAnchor).isActive = true
mapView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
mapView.delegate = self
mapView.showsUserLocation = true
}
override func viewDidAppear(_ animated: Bool) {
let authorizationStatus = CLLocationManager.authorizationStatus()
switch authorizationStatus {
case .authorizedWhenInUse, .authorizedAlways:
break
case .notDetermined, .restricted, .denied:
locationManager.requestWhenInUseAuthorization()
@unknown default:
fatalError()
}
DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(1)) {
for _ in 0...20 {
let currentLocation = self.mapView.userLocation.coordinate
let newLocation = currentLocation.shiftRandomPosition(meters: 30000, randomMeters: true)
self.mapView.addAnnotation(Annotation(coordinate: newLocation))
}
self.mapView.setRegion(MKCoordinateRegion(center: self.mapView.userLocation.coordinate, span: MKCoordinateSpan(latitudeDelta: 0, longitudeDelta: 0)), animated: false)
}
}
func mapView(_ mapView: MKMapView, clusterAnnotationForMemberAnnotations memberAnnotations: [MKAnnotation]) -> MKClusterAnnotation {
MKClusterAnnotation(memberAnnotations: memberAnnotations)
}
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {
guard let annotation = annotation as? Annotation else { return nil }
let identifier = "marker"
let view: MKMarkerAnnotationView
if let dequeuedView = mapView.dequeueReusableAnnotationView(withIdentifier: identifier) as? MKMarkerAnnotationView {
dequeuedView.annotation = annotation
view = dequeuedView
} else {
view = MKMarkerAnnotationView(annotation: annotation, reuseIdentifier: identifier)
}
view.clusteringIdentifier = "identifier"
return view
}
}
class Annotation: NSObject, MKAnnotation {
let coordinate: CLLocationCoordinate2D
init(coordinate: CLLocationCoordinate2D) {
self.coordinate = coordinate
super.init()
}
}
// https://stackoverflow.com/a/55459722/7715250
extension CLLocationCoordinate2D {
/// Get coordinate moved from current to `distanceMeters` meters with azimuth `azimuth` [0, Double.pi)
///
/// - Parameters:
/// - distanceMeters: the distance in meters
/// - azimuth: the azimuth (bearing)
/// - Returns: new coordinate
private func shift(byDistance distanceMeters: Double, azimuth: Double) -> CLLocationCoordinate2D {
let bearing = azimuth
let origin = self
let distRadians = distanceMeters / (6372797.6) // earth radius in meters
let lat1 = origin.latitude * Double.pi / 180
let lon1 = origin.longitude * Double.pi / 180
let lat2 = asin(sin(lat1) * cos(distRadians) + cos(lat1) * sin(distRadians) * cos(bearing))
let lon2 = lon1 + atan2(sin(bearing) * sin(distRadians) * cos(lat1), cos(distRadians) - sin(lat1) * sin(lat2))
return CLLocationCoordinate2D(latitude: lat2 * 180 / Double.pi, longitude: lon2 * 180 / Double.pi)
}
func shiftRandomPosition(meters: Double, randomMeters: Bool) -> CLLocationCoordinate2D {
let finalMeters: Double
if randomMeters {
finalMeters = Double.random(in: -meters..<meters)
} else {
finalMeters = meters
}
let randomAzimuth = Double.random(in: -Double.pi..<Double.pi)
return shift(byDistance: finalMeters, azimuth: randomAzimuth)
}
}
导入UIKit
导入地图套件
类ViewController:UIViewController、MKMapViewDelegate、CLLocationManagerDelegate{
让mapView=MKMapView(帧:.0)
私有let locationManager=CLLocationManager()
重写func viewDidLoad(){
view.addSubview(地图视图)
mapView.TranslatesAutoResizezingMaskintoConstraints=false
mapView.widthAnchor.constraint(equalTo:view.widthAnchor).isActive=true
mapView.heightAnchor.constraint(equalTo:view.heightAnchor).isActive=true
mapView.centerYAnchor.constraint(equalTo:view.centerYAnchor).isActive=true
mapView.centerXAnchor.constraint(equalTo:view.centerXAnchor).isActive=true
mapView.delegate=self
mapView.showsUserLocation=true
}
覆盖函数视图显示(u动画:Bool){
让authorizationStatus=CLLocationManager.authorizationStatus()
交换机授权状态{
案例。授权使用。授权方式:
打破
案例.未确定、.限制、.拒绝:
locationManager.RequestWhenUseAuthorization()
@未知默认值:
法塔莱罗()
}
DispatchQueue.main.asyncAfter(截止日期:.now()+秒(1)){
对于0…20中的uu{
让currentLocation=self.mapView.userLocation.coordinate
设newLocation=currentLocation.shiftRandomPosition(仪表:30000,随机仪表:true)
self.mapView.addAnnotation(注释(坐标:newLocation))
}
self.mapView.setRegion(mkcoordinaterRegion(中心:self.mapView.userLocation.coordinate,span:MKCoordinateSpan(latitudeDelta:0,longitudeDelta:0)),动画:false)
}
}
func映射视图(uMapView:MKMapView,ClusterAnnotationFormMemberAnnotations成员注释:[MKAnnotation])->MKClusterAnnotation{
MKClusterAnnotation(memberAnnotations:memberAnnotations)
}
func locationManager(manager:CLLocationManager,didUpdateLocations位置:[CLLocation]){
}
func mapView(uMapView:MKMapView,viewFor annotation:MKAnnotation)->MKAnnotationView{
guard let annotation=注释为?注释else{return nil}
让identifier=“marker”
let视图:mkmarkerNotationView
如果让dequeuedView=mapView.dequeueReusableAnnotationView(带标识符:identifier)作为?mkMarkerNotationView{
dequeuedView.annotation=注释
view=dequeuedView
}否则{
view=mkmarkerNotationView(注释:注释,reuseIdentifier:identifier)
}
view.clusteringIdentifier=“标识符”
返回视图
}
}
类注释:NSObject,MKAnnotation{
let坐标:CLLocationCoordinate2D
初始(坐标:CLLocationCoordinate2D){
self.coordinate=坐标
super.init()
}
}
// https://stackoverflow.com/a/55459722/7715250
扩展位置坐标2d{
///使用方位角“方位角”[0,Double.pi)将坐标从当前移动到“距离米”
///
///-参数:
///-距离米:以米为单位的距离
///-方位角:方位角(方位角)
///-返回:新坐标
专用功能移位(按距离距离计:双精度,方位角:双精度)->CLLOCATIONCOORDIATE2D{
方位角=方位角
让原点=自我
设distRadians=距离米/(6372797.6)//地球半径(米)
设lat1=origin.latitude*Double.pi/180
设lon1=origin.longitude*Double.pi/180
设lat2=asin(sin(lat1)*cos(distRadians)+cos(lat1)*sin(distRadians)*cos(轴承))
设lon2=lon1+atan2(sin(轴承)*sin(分布盘)*cos(lat1),cos(分布盘)-sin(lat1)*sin(lat2))
返回CLLocationCoordinate2D(纬度:lat2*180/Double.pi,经度:lon2*180/Double.pi)
}
func shiftRandomPosition(仪表:双精度,随机仪表:布尔)->CLLOCATIONCoordinated2D{
让决赛选手:加倍
中频随机数计{
finalMeters=Double.random(in:-meters..YMMV),但是我可以通过显式地将displayPriority设置为.required来解决这个问题。文档说这是默认值,但我在调试时注意到,注释的优先级实际上较低,这会导致它们被用户位置注释阻塞
更新:
这只起了一点作用,但当视图通过出列进行集群和/或重用时,它就会再次停止工作。我尝试在AnnotationView的init()和prepareForDisplay()中设置displayPriority,等等。问题仍然出现。在所有情况下,对我有效的是,每次创建或退出显示优先级时都重置显示优先级。如果您将view.displayPriority=.required
添加到设置clusteringIdentifier
的代码上方或下方,则在返回视图之前,它应该可以工作。对我有效!您可能还必须为mkclusterAnnotationView主动/显式地重置它。当前用户的批注没有群集标识符。如果为当前用户的批注提供群集标识符,则它可以工作