代码之家 › 专栏 › 技术社区 › SHINTO JOSEPH

iOS Mapkit批注无法拖动

mkannotation mapkit swift ios

3

SHINTO JOSEPH · 技术社区 · 7 年前

我是iOS开发新手,我需要在iOS地图中实现一个可拖动的注释。我的代码如下。无论我做什么,我都不能得到一个可拖动的注释。有人能帮我做注释吗?之后,我需要得到pin指向的位置的地址

注册ViewController.swift

class RegistrationViewController: UIViewController,UIPickerViewDelegate,UIPickerViewDataSource,MKMapViewDelegate{
    @IBOutlet weak var mapView: MKMapView!

    override func viewDidLoad() {
        super.viewDidLoad()
        var centerLocation = CLLocationCoordinate2DMake(12.964370125970357, 77.59643554937497)
        var mapspan = MKCoordinateSpanMake(0.01, 0.01)
        var mapregion = MKCoordinateRegionMake(centerLocation, mapspan)
        self.mapView.setRegion(mapregion, animated: true)

        let pin = pinAnnotation(title:"hello",subtitle:"how are you",coordinate:centerLocation)
        mapView.addAnnotation(pin)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func mapView(mapView: MKMapView!, viewForAnnotation annotation: MKAnnotation!) -> MKAnnotationView! {
        if annotation is MKPointAnnotation {
            let pinAnnotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myPin")
            pinAnnotationView.pinColor = .purple
            pinAnnotationView.isDraggable = true
            pinAnnotationView.canShowCallout = true
            pinAnnotationView.animatesDrop = true

            return pinAnnotationView
        }

        return nil
    }

    func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, didChange newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
        switch newState {
        case .starting:
            view.dragState = .dragging
        case .ending, .canceling:
            view.dragState = .none
        default: break
        }
    }

import MapKit

class pinAnnotation:NSObject,MKAnnotation {
    var title:String?
    var subtitle: String?
    var coordinate: CLLocationCoordinate2D
    init(title:String,subtitle:String,coordinate:CLLocationCoordinate2D) {
        self.title = title
        self.subtitle = subtitle
        self.coordinate = coordinate
    }
}

2 回复 | 直到 7 年前

1

4

Dharmesh Kheni Steve Rosenberg 7 年前

对你来说 annotation 不是一个 MKPointAnnotation 类型这就是为什么它没有进入 if annotation is MKPointAnnotation {

它应该是这样的:

func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

    if annotation is pinAnnotation {

        let pinAnnotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myPin")
        pinAnnotationView.pinTintColor = .purple
        pinAnnotationView.isDraggable = true
        pinAnnotationView.canShowCallout = true
        pinAnnotationView.animatesDrop = true

        return pinAnnotationView
    }

    return nil
}

因为 注释 pinAnnotation 类型

我看不见 mapView.delegate = self 在您的代码中。但是,如果你通过故事板分配它,那很好,否则添加它 viewDidLoad

您的完整代码为:

import UIKit
import MapKit

class ViewController: UIViewController,MKMapViewDelegate{
    @IBOutlet weak var mapView: MKMapView!


    override func viewDidLoad() {
        super.viewDidLoad()
        mapView.delegate  = self
        let centerLocation = CLLocationCoordinate2D(latitude: 12.964370125970357, longitude: 77.59643554937497)
        let mapspan = MKCoordinateSpanMake(0.01, 0.01)
        let mapregion = MKCoordinateRegionMake(centerLocation, mapspan)
        self.mapView.setRegion(mapregion, animated: true)

        let pin = pinAnnotation(title:"hello",subtitle:"how are you",coordinate:centerLocation)
        mapView.addAnnotation(pin)

    }


    func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) -> MKAnnotationView? {

        if annotation is pinAnnotation {

            let pinAnnotationView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: "myPin")
            pinAnnotationView.pinTintColor = .purple
            pinAnnotationView.isDraggable = true
            pinAnnotationView.canShowCallout = true
            pinAnnotationView.animatesDrop = true

            return pinAnnotationView
        }

        return nil
    }

    func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, didChange newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
        switch newState {
        case .starting:
            view.dragState = .dragging
        case .ending, .canceling:
            view.dragState = .none
        default: break
        }
    }
}

编辑

view.annotation?.coordinate

检查以下代码:

func mapView(_ mapView: MKMapView, annotationView view: MKAnnotationView, didChange newState: MKAnnotationViewDragState, fromOldState oldState: MKAnnotationViewDragState) {
    switch newState {
    case .starting:
        view.dragState = .dragging
    case .ending, .canceling:
        //New cordinates
        print(view.annotation?.coordinate)
        view.dragState = .none
    default: break
    }
}

2

pesch 7 年前

通过设置 isDraggable 现在,您只需要处理用户停止拖放注释的情况,请参见: how to manage drag and drop for MKAnnotationView on IOS

此外,pinAnnotation应该有一个可设置的坐标。

从…起 Apple documentation

将注释视图标记为可拖动的注释视图提供了内置拖动支持,非常容易拖动并确保注释数据

在注释对象中,实现setCoordinate: 允许地图视图更新注释坐标点。什么时候用户触摸并按住可拖动的注释视图,即地图视图开始对其执行拖动操作。随着拖动操作的进行 mapView:annotationView:didChangeDragState:fromOldState:its方法

要在拖动操作期间设置视图动画,请实现自定义在注释视图中使用dragState方法。随着地图视图的处理拖动相关的触摸事件,它更新受影响的注释视图。实现自定义dragState方法可以您有机会拦截这些更改并执行其他操作开始,并在结束时将针脚放回地图上。

mapView:annotationView:didChangeDragState:fromOldState: