在地图上拖动注释引脚

问题描述：

注释引脚可拖动，但我无法将其放到目标位置。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？在地图上拖动注释引脚

编辑1：

注释销中心似乎从未改变过的位置我把针。

- (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： 在以往任何时候我拖到引脚上， NSLog ou放下的时间总是一样的。

- (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; 
}

@rckoenes THX您的通知。 –

答

首先，你必须创建一个自定义的注释是这样的：

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

在此之后，你只需要使用你的注释是这样的：

// 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];

此外，您必须为您的注释返回一个视图。你可以这样做是这样的：

- (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，一旦你已经通过在控制器的MKMapViewDelegate协议，你抢销的坐标拖动它像这样经过：

- (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); 
    } 
}

你在哪里设置了新坐标？ –

这就是你实现'setCoordinate'方法的原因。从Apple的文档 - > _Annotations支持拖动应实现此方法来更新注释的位置._ – Alladinian

我更新我的帖子中的坐标（只是编辑它）。但似乎不起作用。 –

答

出于蓝，实现您的注释的方法setCoordinates，使一个回调，当你注释坐标已经改变

编辑：当心你的注释，而其运动的dragState财产。

Thx为您的答案。 Plz检查我的帖子的更新。 –

答

不要你wan't做到这一点：

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))]; 
}

在您的委托：

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

答

- (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]; 



    } 
}

感谢您的完整解决方案 –

答

举例雨燕2.2时，Xcode 7.3.1：

创建自定义类采用MKAnnotation协议

（注：斯威夫特不有自动通知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 
    } 
}

申报销视图可拖动：

// 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，销拖动时，它调用的委托方法：

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

在这里，你可以检索新的结束坐标。

或者，你可以创建一个userInfo字典自定义注释的coordinate属性的通知。观察员可以在收到通知后检索这些值。

答

在斯威夫特我的问题是，coordinate属性是我的子类let而不是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() 
    } 
}

在地图上拖动注释引脚

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