在地图视图上拖动注释引脚

注释引脚是可拖动的，但我不能将其拖放到目标位置。 问题是我怎么能得到目标位置的坐标，我放弃注释引脚？ 任何方法存在？

编辑1：

注释引脚的中心似乎从来没有改变，我放弃任何地方的引脚。

- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)annotationView didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState { if (newState == MKAnnotationViewDragStateEnding) { NSLog(@"x is %f", annotationView.center.x); NSLog(@"y is %f", annotationView.center.y); CGPoint dropPoint = CGPointMake(annotationView.center.x, annotationView.center.y); CLLocationCoordinate2D newCoordinate = [self.mapView convertPoint:dropPoint toCoordinateFromView:annotationView.superview]; [annotationView.annotation setCoordinate:newCoordinate]; } } 

编辑2：

Annotation.h

 @property (nonatomic,readwrite,assign) CLLocationCoordinate2D coordinate; 

Annotation.m

 - (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate { coordinate = newCoordinate; } 

编辑3：在哪里我拖动的引脚，NSLog出放弃的总是相同的。

 - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)annotationView didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState { if (newState == MKAnnotationViewDragStateEnding) { CLLocationCoordinate2D droppedAt = annotationView.annotation.coordinate; NSLog(@"Pin dropped at %f,%f", droppedAt.latitude, droppedAt.longitude); } } 

编辑4：

Annotaion.m @dynamic startAddr;

 - (CLLocationCoordinate2D)coordinate { coordinate.latitude = [self.startAddr.latitude doubleValue]; coordinate.longitude = [self.startAddr.longitude doubleValue]; return coordinate; } - (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate { //I need to update the self.startAddr.latitude and longitude here. Problem solved. self.startAddr.latitude = [NSNumber numberWithDouble:newCoordinate.latitude]; self.startAddr.longitude = [NSNumber numberWithDouble:newCoordinate.longitude]; coordinate = newCoordinate; } 

Answer 1

首先你必须像这样创build一个自定义注释：

MyAnnotation.h

 #import <MapKit/MapKit.h> @interface MyAnnotation : NSObject <MKAnnotation>{ CLLocationCoordinate2D coordinate; } - (id)initWithCoordinate:(CLLocationCoordinate2D)coord; - (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate; @end 

MyAnnotation.m

 #import "MyAnnotation.h" @implementation MyAnnotation @synthesize coordinate; - (NSString *)subtitle{ return nil; } - (NSString *)title{ return nil; } -(id)initWithCoordinate:(CLLocationCoordinate2D)coord { coordinate=coord; return self; } -(CLLocationCoordinate2D)coord { return coordinate; } - (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate { coordinate = newCoordinate; } @end 

之后，你只需要像这样使用你的注释：

 // Assuming you have imported MyAnnotation.h and you have a self.map property pointing to a MKMapView MyAnnotation *myPin = [[MyAnnotation alloc] initWithCoordinate:self.map.centerCoordinate]; // Or whatever coordinates... [self.map addAnnotation:myPin]; 

另外，您必须返回一个视图来查看注释。 你可以这样做：

 - (MKAnnotationView *) mapView: (MKMapView *) mapView viewForAnnotation: (id<MKAnnotation>) annotation { MKPinAnnotationView *pin = (MKPinAnnotationView *) [self.map dequeueReusableAnnotationViewWithIdentifier: @"myPin"]; if (pin == nil) { pin = [[[MKPinAnnotationView alloc] initWithAnnotation: annotation reuseIdentifier: @"myPin"] autorelease]; // If you use ARC, take out 'autorelease' } else { pin.annotation = annotation; } pin.animatesDrop = YES; pin.draggable = YES; return pin; } 

然后，一旦你在你的控制器中采用了MKMapViewDelegate协议，你可以像下面这样拖动它来获取一个引脚的坐标：

 - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)annotationView didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState { if (newState == MKAnnotationViewDragStateEnding) { CLLocationCoordinate2D droppedAt = annotationView.annotation.coordinate; NSLog(@"Pin dropped at %f,%f", droppedAt.latitude, droppedAt.longitude); } } 

Answer 2

突然间，实现注释的setCoordinates方法，并在注释坐标发生变化时进行callBAck

编辑：当它的移动时注意你的注释的dragState属性。

Answer 3

你不想这样做：

然后设置注释代理

 - (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate { coordinate = newCoordinate; if (self.delegate respondsToSelector:@selector(mapAnnotationCoordinateHaveChanged)) [self.delegate performSelector(@selector(mapAnnotationCoordinateHaveChanged))]; } 

在你的代表中：

 - (void) mapAnnotationCoordinateHaveChanged{ //some coordinates update code } 

Answer 4

 - (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation { MKAnnotationView *a = [ [ MKAnnotationView alloc ] initWithAnnotation:annotation reuseIdentifier:@"currentloc"]; // a.title = @"test"; if ( a == nil ) a = [ [ MKAnnotationView alloc ] initWithAnnotation:annotation reuseIdentifier: @"currentloc" ]; NSLog(@"%f",a.annotation.coordinate.latitude); NSLog(@"%f",a.annotation.coordinate.longitude); CLLocation* currentLocationMap = [[[CLLocation alloc] initWithLatitude:a.annotation.coordinate.latitude longitude:a.annotation.coordinate.longitude] autorelease]; [self coordinatesToDMS:currentLocationMap]; MKPinAnnotationView *annView=[[MKPinAnnotationView alloc] initWithAnnotation:a reuseIdentifier:@"currentloc"]; if(a.annotation.coordinate.longitude == mapView.userLocation.coordinate.longitude || a.annotation.coordinate.latitude == mapView.userLocation.coordinate.latitude ) { if ([annotation isKindOfClass:MKUserLocation.class]) { //user location view is being requested, //return nil so it uses the default which is a blue dot... return nil; } //a.image = [UIImage imageNamed:@"userlocation.png"]; //a.pinColor=[UIColor redColor]; } else { // annView.image =[UIImage imageNamed:@"map-pin.png"]; //PinFirst=FALSE; //annView.pinColor = [UIColor redColor]; // annView.annotation=annotation; } annView.animatesDrop = YES; annView.draggable = YES; annView.canShowCallout = YES; return annView; } - (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated { NSLog(@"map Drag"); } - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState; { NSLog(@"pin Drag"); if (newState == MKAnnotationViewDragStateEnding) { CLLocationCoordinate2D droppedAt = view.annotation.coordinate; NSLog(@"Pin dropped at %f,%f", droppedAt.latitude, droppedAt.longitude); CLLocation* draglocation = [[[CLLocation alloc] initWithLatitude:droppedAt.latitude longitude:droppedAt.longitude] autorelease]; } } 

Answer 5

Swift 2.2，Xcode 7.3.1的例子：

• 使用MKAnnotation协议创build自定义类

  （注：Swift没有自动通知KVO兼容的属性，所以我已经添加了我自己的 – 这不是必需的）：

   import MapKit class MyAnnotation: NSObject, MKAnnotation { // MARK: - Required KVO-compliant Property var coordinate: CLLocationCoordinate2D { willSet(newCoordinate) { let notification = NSNotification(name: "VTAnnotationWillSet", object: nil) NSNotificationCenter.defaultCenter().postNotification(notification) } didSet { let notification = NSNotification(name: "VTAnnotationDidSet", object: nil) NSNotificationCenter.defaultCenter().postNotification(notification) } } // MARK: - Required Initializer init(coordinate: CLLocationCoordinate2D) { self.coordinate = coordinate } } 

• 将引脚视图声明为可拖动：

   // MARK: - MKMapViewDelegate Actions func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? { let pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: pinViewReuseIdentifier) pinView.draggable = true return pinView } 

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现在，当该引脚被拖动时，它调用委托方法：

 func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) 

在这里，您可以检索新的结束坐标。

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或者，您可以为自定义注释的coordinate属性的通知创build一个userInfo字典。 观察者可以在收到通知后检索这些值。

Answer 6

在Swift中，我的问题是coordinate属性是我的子类中的一个let ，而不是像MKAnnotation中的MKAnnotation 。

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