我無法使用緯度和經度在地圖視圖中添加註釋

我已經從XML文件中讀取緯度和經度，並且我想添加一些註釋。但除了用戶的位置，他們都不是mapview.annotations的added.The計數總是empty.Here是我的代碼：我無法使用緯度和經度在地圖視圖中添加註釋

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
{ 
    if (newLocation != nil) { 
     self.myLocation = newLocation; 
    } 


    mapView.region = MKCoordinateRegionMake(self.myLocation.coordinate, MKCoordinateSpanMake(0.005f, 0.005f)); 
    mapView.zoomEnabled = YES; 
    //mapView.showsUserLocation = YES; 
    mapView.centerCoordinate = self.myLocation.coordinate; 


    MKPointAnnotation *userLocation = [[MKPointAnnotation alloc] init]; 
    userLocation.coordinate = myLocation.coordinate; 
    userLocation.title = @"my position"; 
    userLocation.subtitle = @"my position now"; 
    [mapView removeAnnotations:mapView.annotations]; 

    [mapView addAnnotation:userLocation]; 
    [userLocation release]; 

    if ([self.positionArray count] < 5) { 
     NSString *dataPath = [[NSBundle mainBundle] pathForResource:@"position" ofType:@"xml"]; 
     NSData *positionData = [[NSData alloc] initWithContentsOfFile:dataPath]; 

     NSXMLParser *parser = [[NSXMLParser alloc] initWithData:positionData]; 

     parser.delegate = self; 

     [parser parse]; 
    } 

    if (self.myLocation != nil) { 
     [self.manager stopUpdatingLocation]; 
    } 


}

，這裏是MapInfo的類：

#import <UIKit/UIKit.h> 
#import <CoreLocation/CoreLocation.h> 
#import <MapKit/MapKit.h> 
@interface MapInfo : NSObject<MKAnnotation> 
{ 
    NSString *subtitle; 
    NSString *title; 
    CLLocationCoordinate2D coordinate; 
} 

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

- (id)initWithCoordinate:(CLLocationCoordinate2D)location; 
- (void)setCoordinate:(CLLocationCoordinate2D)newCoordinate; 

@end

然後在這裏是委託方法

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation 
{ 
    static NSString *AnnotationIdentifier = @"AnnotationIdentifer"; 
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:AnnotationIdentifier]; 
    if ([annotation isKindOfClass:[MapInfo class]]) { 
     if (pinView == nil) { 
      pinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease]; 
     } 
     pinView.pinColor = MKPinAnnotationColorRed; 
     pinView.canShowCallout = YES; 
     pinView.animatesDrop = NO; 
    }else if([annotation isKindOfClass:[MKPointAnnotation class]]) 
    { 
     if (pinView == nil) { 
      pinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease]; 
     } 
     pinView.pinColor = MKPinAnnotationColorPurple; 
     pinView.canShowCallout = YES; 
     pinView.animatesDrop = NO; 
    } 
    return pinView; 
}

我真的不知道爲什麼只可添加用戶的位置，有人幫我請！它已經困擾了我好幾天！

來源

2012-06-27 Edward Zhang

看起來你可能忘記了設置mapView的委託。

來源

2013-02-17 20:13:52 RLB

我無法使用緯度和經度在地圖視圖中添加註釋

回答

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