Question

您好我的应用程序中的朋友我在mapview上显示多个图钉。我有两个mutablearray首先用于纬度，第二个用于经度，每个数组都有10个值，因为我在我的方法中显示了以下代码：

- (void)showAddressAllBusiness {
    annotationsarray=[[NSMutableArray alloc] init];

      NSLog(@"%d",[listOfLatitude count]);
     NSLog(@"%d",[listOfLongitude count]);
     NSLog(@"%d",[listOfPlaceName count]);

    for (int i =0;i < [listOfLatitude count]; i++) {
        MKCoordinateRegion region =  { {0.0, 0.0 }, { 0.0, 0.0 } };
        region.center.latitude = [[listOfLatitude objectAtIndex:i] doubleValue];
        region.center.longitude = [[listOfLongitude objectAtIndex:i] doubleValue];
        region.span.longitudeDelta = 0.1f;
        region.span.latitudeDelta = 0.1f;
        [self.mapViewCityGuide setRegion:region animated:YES];
        [self.mapViewCityGuide setZoomEnabled:YES];
        addAnnotation = [[AddressAnnotation alloc]init];

        addAnnotation.mTitle = [NSString stringWithFormat:@"%@",[listOfPlaceName objectAtIndex:i]];
        addAnnotation.coordinate = region.center;
        [self.mapViewCityGuide addAnnotation:addAnnotation];
        [annotationsarray addObject:addAnnotation];


    }
    NSLog(@"%d",[self.mapViewCityGuide.annotations count]);
    [self centerMap];
}

当我使用从webservice出现的纬度和经度数组值时这段代码工作不正常，我调试代码然后mapViewCityGuide得到nil或0x0。

如果我使用硬编码纬度和经度值如数组中提到并调用此方法那么它将显示地图上的所有引脚如何解决此问题

listOfPlaceName = [[NSMutableArray alloc] initWithObjects:@"test",@"test",@"test",@"pithempur",@"test",@"test",@"test",@"test", nil];

    listOfLatitude = [[NSMutableArray alloc] initWithObjects:@"22.71957",@"23.17930",@"22.96123",@"22.60987",@"22.45260",@"22.55244",@"22.60000",@"22.68330", nil];

   listOfLongitude = [[NSMutableArray alloc] initWithObjects:@"75.85773",@"75.78491",@"76.05141",@"75.69644",@"75.94197",@"75.75653",@"75.30000",@"75.61670", nil];


   [self showAddressAllBusiness];

Answer 1

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    mapView.delegate=self;




    [mapView removeAnnotations:mapView.annotations];




    NSMutableArray* annotations=[[NSMutableArray alloc] init];
    for (int j=0; j<10; j++) 
    {

        CLLocationCoordinate2D theCoordinate1;

        theCoordinate1.latitude = [[NSString stringWithFormat:@"%i",10+j]doubleValue];

        theCoordinate1.longitude = [[NSString stringWithFormat:@"%i",72+j]doubleValue];

       //my annotation is mkannotation class

        MyAnnotation* myAnnotation1=[[MyAnnotation alloc] init];

        myAnnotation1.coordinate=theCoordinate1;

        myAnnotation1.title=[NSString stringWithFormat:@"locatiion %i",j];



        [mapView addAnnotation:myAnnotation1];

        [annotations addObject:myAnnotation1];


    }

    NSLog(@"%d",[annotations count]);

    MKMapRect flyTo = MKMapRectNull;

    for (id <MKAnnotation> annotation in annotations) {
        NSLog(@"fly to on");
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
        if (MKMapRectIsNull(flyTo)) {
            flyTo = pointRect;
        } else {
            flyTo = MKMapRectUnion(flyTo, pointRect);

        }
    }


    mapView.visibleMapRect = flyTo;


}

#pragma mark MKMapViewDelegate
/*
 - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
 {
 return [kml viewForOverlay:overlay];
 }
 */
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    NSLog(@"welcome into the map view annotation");

    if ([annotation isKindOfClass:[MyAnnotation class]])
    {
        static NSString *AnnotationIdentifier = @"AnnotationIdentifier";
        MKPinAnnotationView* pinView = [[[MKPinAnnotationView alloc]
                                         initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
        if (!pinView)
        {
            pinView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
            pinView.canShowCallout = YES;
            pinView.animatesDrop = YES;
        }
        else
        {
            pinView.annotation = annotation;
            pinView.tag=((MyAnnotation *)annotation).tag;
            pinView.canShowCallout = YES;
            pinView.animatesDrop = NO;
        }

        UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeCustom];
        rightButton.frame=CGRectMake(0, 0, 14, 16);
        [rightButton setBackgroundImage:[UIImage imageNamed:@"arrow_s5.png"] forState:UIControlStateNormal];

        [rightButton setTitle:annotation.title forState:UIControlStateNormal];
        rightButton.tag=((MyAnnotation *)annotation).tag;
        [rightButton addTarget:self
                        action:@selector(showDetails:)
              forControlEvents:UIControlEventTouchUpInside];
        pinView.rightCalloutAccessoryView = rightButton;


        return pinView;
    }

    return nil;
}

Answer 2

* 请尝试以下代码： - *

-(void)viewDidLoad
{

    CLLocation *userLoc = mapView.userLocation.location;
    CLLocationCoordinate2D userCoordinate = userLoc.coordinate;

    NSLog(@"user latitude = %f",userCoordinate.latitude);
    NSLog(@"user longitude = %f",userCoordinate.longitude);

    mapView.delegate=self;

    NSMutableArray* annotations=[[NSMutableArray alloc] init];
    MyAnnotation* myAnnotation;

    for (int i = 0; i<[DataArr count]; i++) 
    {
        CLLocationCoordinate2D theCoordinate;

        double a = [[[DataArr objectAtIndex:i] valueForKey:@"lat"] doubleValue];
        double b =[[[DataArr objectAtIndex:i] valueForKey:@"lon"] doubleValue];

        theCoordinate.latitude = a;
        theCoordinate.longitude =b;

        myAnnotation=[[MyAnnotation alloc] init];
        NSString *str=[NSString stringWithFormat:@"%d",i];
        [myAnnotation indexOfAccessibilityElement:str];

        myAnnotation.coordinate=theCoordinate;
        myAnnotation.title=[[DataArr objectAtIndex:i] valueForKey:@"name"];
        myAnnotation.ID_map=i;
        [annotations addObject:myAnnotation];
    }

    for (int i =0; i<[annotations count]; i++) 
    {
        [mapView addAnnotation:[annotations objectAtIndex:i]];
    }

   // Walk the list of overlays and annotations and create a MKMapRect that
    // bounds all of them and store it into flyTo.
    MKMapRect flyTo = MKMapRectNull;
    for (id <MKAnnotation> annotation in annotations) 
    {
        NSLog(@"fly to on");
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
        if (MKMapRectIsNull(flyTo)) 
        {
            flyTo = pointRect;
        } else 
        {
            flyTo = MKMapRectUnion(flyTo, pointRect);
            //NSLog(@"else-%@",annotationPoint.x);
        }
    }

   // Position the map so that all overlays and annotations are visible on screen.
    mapView.visibleMapRect = flyTo;

}

#pragma mark MKMapViewDelegate

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
{

    NSLog(@"didSelectAnnotationView");
}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    NSLog(@"welcome into the map view annotation");

    // if it's the user location, just return nil.
    if ([annotation isKindOfClass:[MKUserLocation class]])
        return nil;

    // try to dequeue an existing pin view first
    static NSString* AnnotationIdentifier = @"AnnotationIdentifier";
    MKPinAnnotationView* pinView = [[[MKPinAnnotationView alloc]
                                     initWithAnnotation:annotation reuseIdentifier:AnnotationIdentifier] autorelease];
    pinView.animatesDrop=YES;
    pinView.canShowCallout=YES;
    pinView.pinColor=MKPinAnnotationColorPurple;


    UIButton* rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    [rightButton setTitle:annotation.title forState:UIControlStateNormal];
    [rightButton addTarget:self
                    action:@selector(showDetails:)
          forControlEvents:UIControlEventTouchUpInside];
    pinView.rightCalloutAccessoryView = rightButton;



    UIImageView *profileIconView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"profile.png"]];
    pinView.leftCalloutAccessoryView = profileIconView;
    [profileIconView release];


    return pinView;
}

在MKMap iPhone上显示多个引脚

2 个答案: