如何在MKMapView中添加不同的图像而不是引脚？

Question

我一直在研究一个有MKMapView的应用程序,我想用不同的图像自定义引脚.我已经这样做但只有一个图像,现在我需要一个pin显示一个图像,另一个pin显示另一个图像.我怎样才能做到这一点？如果有帮助,这是我的代码:

-(MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation{

MKAnnotationView *pinView = nil;
if(annotation != _mapView.userLocation)
{
    static NSString *defaultPinID;
    pinView = (MKAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:defaultPinID];
    if ( pinView == nil )
        pinView = [[MKAnnotationView alloc]
                   initWithAnnotation:annotation reuseIdentifier:defaultPinID];


    pinView.canShowCallout = YES;
    pinView.image = [UIImage imageNamed:@"image1.jpg"];
}
else {
    [_mapView.userLocation setTitle:@"Your Location"];
}
return pinView;   }

我需要第二个和第三个显示相同的图像,但第一个是不同的图像它如下所示:

- (void)viewWillAppear:(BOOL)animated {CLLocationCoordinate2D First; First.latitude = -12.098970; First.longitude = -77.034531; MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init]; annotationPoint.coordinate = First; annotationPoint.title = @"First"; annotationPoint.subtitle = @"Subtitle1"; [_mapView addAnnotation:annotationPoint];

CLLocationCoordinate2D Second; Second.latitude = -12.098299; Second.longitude = -77.068364; MKPointAnnotation *annotationPoint2 = [[MKPointAnnotation alloc] init]; annotationPoint2.coordinate = Second; annotationPoint2.title = @"Second"; annotationPoint2.subtitle = @"Subtitle2"; [_mapView addAnnotation:annotationPoint2];

CLLocationCoordinate2D Third; Third.latitude = -12.125888; Third.longitude = -77.023346; MKPointAnnotation *annotationPoint3 = [[MKPointAnnotation alloc] init]; annotationPoint3.coordinate = Third; annotationPoint3.title = @"Third"; annotationPoint3.subtitle = @"Subtitle3"; [_mapView addAnnotation:annotationPoint3];}

Answer 1

确保项目中有MapKit.framework和CoreLocation.framework.

我的定制图像是39高32宽.没有尝试过其他尺寸,但可以随意尝试.我的2针图像叫做pin1.png和pin2.png

确保正确命名图像以匹配代码中的图像.

在我的例子中,我没有使用当前位置,而是使用静态自定义位置(认为巴哈马对于这个例子会很好).在您的项目中,您当然可以使用位置管理器来获取用户的当前位置.

我已经测试了我的示例并成功地在地图上丢弃了2个引脚,每个引脚都有自己的自定义图像.

这不是最干净的代码,但我只有有限的时间来编写代码.

这是ViewController.h的代码

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import <CoreLocation/CoreLocation.h>

@interface ViewController : UIViewController <CLLocationManagerDelegate, MKMapViewDelegate>

@end

这是ViewController.h的代码

#import "ViewController.h"
#import "MyAnnotation.h"
#import <MapKit/MapKit.h>

@interface ViewController ()

@property (strong, nonatomic) IBOutlet MKMapView *myMapView;

@end

@implementation ViewController


- (void)viewDidLoad {
    [super viewDidLoad];

    // setup the map view, delegate and current location

    [self.myMapView setDelegate:self];

    self.myMapView.mapType = MKMapTypeStandard;

    CLLocationCoordinate2D myLocation = CLLocationCoordinate2DMake(25.085130,-77.331428);
    [self.myMapView setCenterCoordinate:myLocation];

    MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(myLocation, 2000, 2000);
    region.center = self.myMapView.centerCoordinate;
    self.myMapView.showsUserLocation = YES;
    [self.myMapView setRegion:region animated:YES];

    [self dropPins];
}

-(void)dropPins {
    NSMutableArray *annotationArray = [[NSMutableArray alloc] init];

    CLLocationCoordinate2D location1 = CLLocationCoordinate2DMake(25.085130, -77.331428);
    MyAnnotation *annotation1 = [[MyAnnotation alloc] initWithCoordinates:location1 image:@"pin1.png"];
    [annotationArray addObject:annotation1];
    [self.myMapView addAnnotations:annotationArray];

    [annotationArray removeAllObjects];
    CLLocationCoordinate2D location2 = CLLocationCoordinate2DMake(25.085130, -77.336428);
    MyAnnotation *annotation2 = [[MyAnnotation alloc] initWithCoordinates:location2 image:@"pin2.png"];
    [annotationArray addObject:annotation2];
    [self.myMapView addAnnotations:annotationArray];
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    static NSString *identifier = @"MyLocation";
    if ([annotation isKindOfClass:[MyAnnotation class]])
    {
        MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[self.myMapView dequeueReusableAnnotationViewWithIdentifier:identifier];

        if (annotationView == nil)
        {
            annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier];
        } else
        {
            annotationView.annotation = annotation;
        }

        annotationView.enabled = YES;
        annotationView.canShowCallout = NO;

        if([[(MyAnnotation *)annotationView.annotation image] isEqualToString:@"pin1.png"])
            annotationView.image = [UIImage imageNamed:@"pin1.png"];

        if([[(MyAnnotation *)annotationView.annotation image] isEqualToString:@"pin2.png"])
            annotationView.image = [UIImage imageNamed:@"pin2.png"];

        return annotationView;
    }
    return nil;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

这是MyAnnotation.h的代码

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MyAnnotation : NSObject <MKAnnotation>

@property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy, readonly) NSString *image;


-(id)initWithCoordinates:(CLLocationCoordinate2D) paramCoordinates
                   image:(NSString *) paramImage;

@end

这是MyAnnotation.m的代码

#import "MyAnnotation.h"

@implementation MyAnnotation

-(id)initWithCoordinates:(CLLocationCoordinate2D)paramCoordinates
                   image:(NSString *)paramImage
{
    self = [super init];
    if(self != nil)
    {
        _coordinate = paramCoordinates;
        _image = paramImage;
    }
    return (self);
}

@end