检测用户是不是退出 MKCircle |地图套件

Posted 2023-03-05

【中文标题】检测用户是不是退出 MKCircle |地图套件

【英文标题】：Detect if user stepped out MKCircle | MapKit检测用户是否退出 MKCircle |地图套件

【发布时间】：2017-12-25 18:51:53

【问题描述】：

我需要的东西（更简单的解释）：

[完成] 获取用户位置并在 UIMapView 中显示 [完成] 在 UIMapView 中围绕用户添加圈子 检测用户是否离开该圈子

这是我的 1 和 2 代码：

import UIKit 
import MapKit 
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate, MKMapViewDelegate 

    @IBOutlet weak var myMap: MKMapView!

    let manager = CLLocationManager()
    var addedCircle = false


    func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) 

        let location = locations[0]

        let span: MKCoordinateSpan = MKCoordinateSpanMake(0.01, 0.01)
        let myLocation: CLLocationCoordinate2D = CLLocationCoordinate2DMake(location.coordinate.latitude,
                                                                        location.coordinate.longitude)
        let region: MKCoordinateRegion = MKCoordinateRegionMake(myLocation, span)

        myMap.setRegion(region, animated: true)



        self.myMap.showsUserLocation = true

        if !addedCircle 
            self.addRadiusCircle(location: location)
            putted = true
        

    



    func addRadiusCircle(location: CLLocation)
        self.myMap.delegate = self
        let circle = MKCircle(center: location.coordinate, radius: 100)
        self.myMap.add(circle)
    

    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer 
        if overlay is MKCircle 
            let circle = MKCircleRenderer(overlay: overlay)
            circle.strokeColor = UIColor.red
            circle.fillColor = UIColor(red: 255, green: 0, blue: 0, alpha: 0.1)
            circle.lineWidth = 1
            return circle
         else 
            return MKPolylineRenderer()
        
    


    override func viewDidLoad() 
        super.viewDidLoad()

        manager.delegate = self
        manager.desiredAccuracy = kCLLocationAccuracyBest
        manager.requestWhenInUseAuthorization()
        manager.startUpdatingLocation()

    

这是这段代码的结果：

那个圆圈不随用户移动，我想知道如何检测用户是否走出那个红色圆圈，提前感谢您的回答

【问题讨论】：

你是说区域监控吗？文档链接：developer.apple.com/library/content/documentation/… 但 *** 上有很多区域监控问题。您需要更具体地说明您的问题。

【参考方案1】：

您可以使用CLLocation的distance(from:)方法来确定用户当前位置与圆心的距离。

let location = CLLocation()
let circleCenter = CLLocation()

if location.distance(from: circleCenter) > circleRadius 
    // User is outside of circle.