[英]Drag an annotation pin on a mapview
注释图钉是可拖动的,但我无法将其放置到目标位置。 问题是,如何在放置注释图钉的地方获取目标位置的坐标? 有没有方法?
编辑1:
注释图钉的中心似乎永远不会改变,无论我将图钉放在哪里。
- (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:
注释
@property (nonatomic,readwrite,assign) CLLocationCoordinate2D coordinate;
批注
- (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate {
coordinate = newCoordinate;
}
编辑3:在我将销拖到哪里的地方,dropAtAt的NSLog输出始终相同。
- (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;
}
首先,您必须创建一个自定义注释,如下所示:
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,您只需要像这样使用注释:
// 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,您必须返回注释的视图。 您可以这样做:
- (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,一旦在控制器中采用了MKMapViewDelegate
协议,就可以像这样拖动它来获取销的坐标:
- (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);
}
}
突然,实现注释的setCoordinates方法,并在注释坐标发生更改时进行callBAck
编辑:注意注释在移动时的dragState属性。
你不这样做吗:
设置注释委托,然后
- (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate {
coordinate = newCoordinate;
if (self.delegate respondsToSelector:@selector(mapAnnotationCoordinateHaveChanged))
[self.delegate performSelector(@selector(mapAnnotationCoordinateHaveChanged))];
}
在您的代表中:
- (void) mapAnnotationCoordinateHaveChanged{
//some coordinates update code
}
- (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];
}
}
Swift 2.2,Xcode 7.3.1的示例:
创建采用MKAnnotation协议的自定义类
(注意:Swift没有自动通知符合KVO的属性,因此我添加了自己的通知-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 } }
将图钉视图声明为可拖动:
// MARK: - MKMapViewDelegate Actions func mapView(mapView: MKMapView, viewForAnnotation annotation: MKAnnotation) -> MKAnnotationView? { let pinView = MKPinAnnotationView(annotation: annotation, reuseIdentifier: pinViewReuseIdentifier) pinView.draggable = true return pinView }
现在,当拖动图钉时,它将调用委托方法:
func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView)
在这里,您可以检索新的终点坐标。
另外,您可以为自定义注释的coordinate
属性的通知创建一个userInfo
字典。 然后,观察者可以在收到通知后检索值。
在斯威夫特我的问题是, coordinate
属性是一个let
我的子类,而不是一个var
,因为它是在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()
}
}
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