我已尝试过几乎所有内容都可以显示图像而不是MKMapView上的默认红色图钉。
互联网上有很多关于此问题的答案,但他们都继续给我这个:
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
if([annotation isKindOfClass:[MKUserLocation class]])
return nil;
NSString *annotationIdentifier = @"CustomViewAnnotation";
MKAnnotationView* annotationView = [mapview dequeueReusableAnnotationViewWithIdentifier:annotationIdentifier];
if(!annotationView)
{
annotationView = [[MKAnnotationView alloc] initWithAnnotation:annotation
reuseIdentifier:annotationIdentifier]];
}
annotationView.image = [UIImage imageNamed:@"map_location_pin.png"];
annotationView.canShowCallout= YES;
return annotationView;
}
这根本不能帮助我,它只是一种方法。
请告诉我如何使用它来使方法返回带有自定义图像的注释。 几乎所有其他答案都告诉我实施该方法而没有进一步的解释。
我在哪里打电话?我怎么称呼它?
谢谢!
答案 0 :(得分:17)
管理我自己解决这个问题,这是我在4个步骤中所做的:
步骤1:您必须将mapview的委托设置为ViewController:
MapViewController.h
@interface MapViewController : UIViewController <MKMapViewDelegate> {
IBOutlet MKMapView *mapView;
}
@property (nonatomic, nonatomic) IBOutlet MKMapView *mapView;
MapViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
[mapView setDelegate:self];
}
第2步:实施方法:
MapViewController.m
-(MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"current"];
//MyPin.pinColor = MKPinAnnotationColorPurple;
UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[advertButton addTarget:self action:@selector(button:) forControlEvents:UIControlEventTouchUpInside];
/*MyPin.rightCalloutAccessoryView = advertButton;
MyPin.draggable = YES;
MyPin.animatesDrop=TRUE;
MyPin.canShowCallout = YES;*/
MyPin.highlighted = NO;
MyPin.image = [UIImage imageNamed:@"myCustomPinImage"];
return MyPin;
}
步骤3:创建一个名为“注释”(或任何其他名称)的类
Annotation.h
#import <Foundation/Foundation.h>
#import <MapKit/MKAnnotation.h>
@interface Annotation : NSObject <MKAnnotation> {
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
}
@property(nonatomic, assign) CLLocationCoordinate2D coordinate;
@property(nonatomic, copy) NSString *title;
@property(nonatomic, copy) NSString *subtitle;
@end
Annotation.m
#import "Annotation.h"
@implementation Annotation
@synthesize coordinate, title, subtitle;
@end
第4步:添加注释,您将获得自定义图像!
MapViewController.m
MKCoordinateRegion Bridge = { {0.0, 0.0} , {0.0, 0.0} };
Bridge.center.latitude = [[[testArr objectAtIndex:updates] objectAtIndex:1] floatValue];
Bridge.center.longitude = [[[testArr objectAtIndex:updates] objectAtIndex:0] floatValue];
Bridge.span.longitudeDelta = 0.01f;
Bridge.span.latitudeDelta = 0.01f;
Annotation *ann = [[Annotation alloc] init];
ann.title = @"I'm a pin";
ann.subtitle = @"Your subtitle";
ann.coordinate = Bridge.center;
[mapView addAnnotation:ann];
我希望这有帮助!