iPhone:MKMapView和多引脚

Question

我想在MKMapView中为我的程序中的"体育"类别位置显示多个pin。有人能指导我如何在距离当前位置约20英里的"体育"场所的MKMapView中显示多针吗？

谢谢。

Answer 1

创建注释对象并将它们添加到映射中。我称之为LocalAnnotation。

LocalAnnotation.h:

@interface LocationAnnotation : NSObject <MKAnnotation>
{
    CLLocationCoordinate2D coordinate;
    NSString *title;
    NSString *subtitle;
}
@property (nonatomic) CLLocationCoordinate2D coordinate;
@property (nonatomic, copy) NSString *title;
@property (nonatomic, copy) NSString *subtitle;
-initWithCoordinate:(CLLocationCoordinate2D)inCoord;
@end

LocalAnnotation.m:

#import "locationAnnotation.h"
@implementation LocationAnnotation
@synthesize coordinate;
@synthesize title;
@synthesize subtitle;
-init
{
    return self;
}
-initWithCoordinate:(CLLocationCoordinate2D)inCoord
{
    coordinate = inCoord;
    return self;
}
@end

在使用地图的方法中：

//erase all annotations
[self.geoMap removeAnnotations:[self.geoMap annotations]];   //geoMap is an MKMapView object.
//Set the pin
CLLocationCoordinate2D newCoordinate;
newCoordinate.latitude     = (CLLocationDegrees) [exifGeoLatitudeNumeric doubleValue];  //exifGeoLatitudeNumeric is a NSNumber representing a coordinate in the format +/-23.5435423
newCoordinate.longitude    = (CLLocationDegrees) [exifGeoLongitudeNumeric doubleValue];  //exifGeoLongitudeNumeric is a NSNumber representing a coordinate in the format +/y23.5435423
LocationAnnotation      *newAnnotation  = [[LocationAnnotation alloc] initWithCoordinate:newCoordinate];
[self.geoMap addAnnotation:newAnnotation];