MKMapview如何在指定位置（经度/纬度）放置大头针

Question

我有纬度和经度值，需要在该位置放置标记。

有人可以提供如何操作的建议吗？

- 3sl

Answer 1

以下是一个非常简单的解决方案，可以在给定的位置上放置标记，该位置由CLLocationCoordinate2D定义。

在MKMapView上放置标记

编辑：

CLLocationCoordinate2D  ctrpoint;
ctrpoint.latitude = 53.58448;
ctrpoint.longitude =-8.93772;
AddressAnnotation *addAnnotation = [[AddressAnnotation alloc] initWithCoordinate:ctrpoint]; 
[mapview addAnnotation:addAnnotation];
[addAnnotation release];

- Jhaliya - Praveen Sharma

---

谢谢。使用initWithCoordinate:ctrpoint];的语法是什么？也就是说，我如何添加我的经纬度？ - 3sl

不需要为放置图钉而创建/使用自定义类，可以使用苹果提供的MKPointAnnotation类。 - BreadicalMD

Answer 2

你需要做以下操作：
1. 将MapKit框架添加到你的项目中。 2. 创建一个实现MKAnnotation协议的类。
示例:

Annotation.h

@interface Annotation : NSObject <MKAnnotation> {
    NSString *_title;
    NSString *_subtitle;

    CLLocationCoordinate2D _coordinate;
}

// Getters and setters
- (void)setTitle:(NSString *)title;
- (void)setSubtitle:(NSString *)subtitle;

@end

注释.m

@implementation Annotation

#pragma mark -
#pragma mark Memory management

- (void)dealloc {
    [self setTitle:nil];
    [self setSubtitle:nil];

    [super dealloc];
}

#pragma mark -
#pragma mark Getters and setters

- (NSString *)title {
    return _title;
}

- (NSString *)subtitle {
    return _subtitle;
}

- (void)setTitle:(NSString *)title {    
    if (_title != title) {
        [_title release];
        _title = [title retain];
    }
}

- (void)setSubtitle:(NSString *)subtitle {
    if (_subtitle != subtitle) {
        [_subtitle release];
        _subtitle = [subtitle retain];
    }
}

- (CLLocationCoordinate2D)coordinate {
    return _coordinate;
}

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

@end

2. 创建此类的实例并设置lat/lon属性
3. 使用此方法将该实例添加到MKMapView对象中：

- (void)addAnnotation:(id<MKAnnotation>)annotation

4. 你应该设置地图的代理并实现以下方法：

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    if ([annotation isKindOfClass:[MKUserLocation class]]) {
        return nil;
    }

    static NSString* ShopAnnotationIdentifier = @"shopAnnotationIdentifier";
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:ShopAnnotationIdentifier];
    if (!pinView) {
        pinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:ShopAnnotationIdentifier] autorelease];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = YES;
    }
    return pinView;
}

- Infinite Possibilities

Answer 3

假定您已启用ARC并包含了MapKit框架。

首先创建一个实现MKAnnotation协议的类。我们将其称为MapPinAnnotation。

MapPinAnnotation.h

@interface MapPinAnnotation : NSObject <MKAnnotation>

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, readonly) NSString* title;
@property (nonatomic, readonly) NSString* subtitle;

- (id)initWithCoordinates:(CLLocationCoordinate2D)location
                placeName:(NSString *)placeName
              description:(NSString *)description;

@end

MapPinAnnotation.m

@implementation MapPinAnnotation

@synthesize coordinate;
@synthesize title;
@synthesize subtitle;

- (id)initWithCoordinates:(CLLocationCoordinate2D)location
                placeName:(NSString *)placeName
              description:(NSString *)description;
{
  self = [super init];
  if (self)
  {    
    coordinate = location;
    title = placeName;
    subtitle = description;
  }

  return self;
}

@end

然后使用以下方式将注释添加到地图中：

CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(34.421496,
                                                              -119.70182);

MapPinAnnotation* pinAnnotation = 
  [[MapPinAnnotation alloc] initWithCoordinates:coordinate
                                      placeName:nil
                                    description:nil];
[mMapView addAnnotation:pinAnnotation];

包含该代码的类必须实现MKMapViewDelegate协议。特别是，您需要定义以下函数来绘制图钉：

- (MKAnnotationView *)mapView:(MKMapView *)mapView 
            viewForAnnotation:(id <MKAnnotation>)annotation
{
  if ([annotation isKindOfClass:[MKUserLocation class]])
  {
    return nil;
  }

  static NSString* myIdentifier = @"myIndentifier";
  MKPinAnnotationView* pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:myIdentifier];

  if (!pinView)
  {
    pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:myIdentifier];
    pinView.pinColor = MKPinAnnotationColorRed;
    pinView.animatesDrop = NO;
  }
  return pinView;
}

在这个例子中，MKAnnotation的标题和副标题成员变量没有被使用，但是它们可以在委托函数中显示。

- filitchp

---

我一直收到一个 -[MapPinAnnotation setCoordinate:]: unrecognized selector sent to instance 错误。 - Isuru

Answer 4

-(MKPointAnnotation *)showClusterPoint:(CLLocationCoordinate2D)coords withPos:(NSString *)place
{
    float  zoomLevel = 0.5;
    region = MKCoordinateRegionMake (coords, MKCoordinateSpanMake (zoomLevel, zoomLevel));
    [mapView setRegion: [mapView regionThatFits: region] animated: YES];

    point = [[MKPointAnnotation alloc]init];
    point.coordinate = coords;
    point.title=place;

    [mapView addAnnotation:point];

    return point;
}

- Ankit Goyal

Answer 5

Swift版本

        let location = CLLocationCoordinate2DMake(13.724362, 100.515342);
        let region = MKCoordinateRegionMakeWithDistance(location, 500.0, 700.0)
        self.mkMapView.setRegion(region, animated: true)
        // Drop a pin
        let dropPin = MKPointAnnotation();
        dropPin.coordinate = location;
        dropPin.title = "Le Normandie Restaurant";
        self.mkMapView.addAnnotation(dropPin);

- Deepak Thakur

Answer 6

Please use this code. its working fine.
-(void)addAllPinsOnMapView
{
MKCoordinateRegion region = mapViewOffer.region;
region.center = CLLocationCoordinate2DMake(23.0225, 72.5714);
region.span.longitudeDelta= 0.1f;
region.span.latitudeDelta= 0.1f;
[mapViewOffer setRegion:region animated:YES];
mapViewOffer.delegate=self;

MKPointAnnotation *mapPin = [[MKPointAnnotation alloc] init];
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(23.0225, 72.5714);
mapPin.title = @"Title";
mapPin.coordinate = coordinate;
[mapViewOffer addAnnotation:mapPin];
}
- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:
(MKAnnotationView *)view
{
NSLog(@"%@",view.annotation.title);
NSLog(@"%f",view.annotation.coordinate.latitude);
NSLog(@"%f",view.annotation.coordinate.longitude);
}

- (MKAnnotationView *)mapView:(MKMapView *)theMapView 
viewForAnnotation:(id <MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[MKUserLocation class]])
{
    ((MKUserLocation *)annotation).title = @"Current Location";
    return nil;
}
else
{
    MKAnnotationView *pinView = nil;
    static NSString *defaultPinID = @"annotationViewID";
    pinView = (MKAnnotationView *)[mapViewOffer dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
    if ( pinView == nil ){
        pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:defaultPinID];
    }
    pinView.canShowCallout = YES;
    pinView.image = [UIImage imageNamed:@"placeholder"];

    UIButton *infoButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    //    [infoButton addTarget:self action:@selector(infoButtonPressed:) forControlEvents:UIControlEventTouchUpInside];
    pinView.rightCalloutAccessoryView = infoButton;
    pinView.rightCalloutAccessoryView.tag=1;
    return pinView;
}
}
- (MKPinAnnotationView*)myMap:(MKMapView*)myMap viewForAnnotation:
(id<MKAnnotation>)annotation{

MKPinAnnotationView *pin = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"CustomPin"];

UIImage *icon = [UIImage imageNamed:@"bustour.png"];
UIImageView *iconView = [[UIImageView alloc] initWithFrame:CGRectMake(8,0,32,37)];

if(icon == nil)
    NSLog(@"image: ");
else
    NSLog(@"image: %@", (NSString*)icon.description);

[iconView setImage:icon];
[pin addSubview:iconView];
pin.canShowCallout = YES;
pin.pinColor = MKPinAnnotationColorPurple;

return pin;
}

- (IBAction)btnLocateMe:(UIButton *)sender
{
[mapViewOffer setCenterCoordinate:mapViewOffer.userLocation.location.coordinate animated:YES];
}

- Masterios