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iPhone アプリに Google マップを実装しています。テキストフィールドを使用して特定の都市を検索すると、Google マップがその都市のアニメーションを一瞬表示してから、現在の場所に戻ります。なぜそれが起こっているのかわからないので、目的の場所を取得するために何をする必要があるか教えてください.

これは私が実装したコードです

-(IBAction)changeMapType:(id)sender{
    seg = (UISegmentedControl*)sender;
    if (seg.selectedSegmentIndex == 0) {
        mMapView.mapType = MKMapTypeStandard;
    }
    else if (seg.selectedSegmentIndex == 1) {
        mMapView.mapType = MKMapTypeSatellite;
    }

}


#pragma mark annotation callbacks

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation{
    NSLog(@"This is called");
    MKPinAnnotationView *annView=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"customloc"];
    [annView setPinColor:MKPinAnnotationColorPurple];
    return annView;
}

#pragma mark location callbacks
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    NSLog(@"location found... updating region");
    [self addPins:newLocation.coordinate.latitude lon:newLocation.coordinate.longitude];
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
    NSLog(@"location not available");
}


#pragma mark geo functions

-(void)addPins:(float)lat lon:(float)lon{

    CLLocationCoordinate2D location;
    location.latitude = lat;
    location.longitude = lon;

    // forcus around you
    MKCoordinateRegion region;
    region.center=location;
    MKCoordinateSpan span;
    span.latitudeDelta=0.5f;
    span.longitudeDelta=0.5f;
    region.span=span;
    [mMapView setRegion:region animated:TRUE];


    float westLon = region.center.longitude - region.span.longitudeDelta;

    float southLat = region.center.latitude - region.span.latitudeDelta;


        // random fill the screen -> this should convert to database driven coordinates
        location.latitude=southLat + (region.span.latitudeDelta/50.0f)*(arc4random()%100);
        location.longitude=westLon + (region.span.longitudeDelta/50.0f)*(arc4random()%100);

        // add custom place mark
        CustomPlaceMark *placemark=[[CustomPlaceMark alloc] initWithCoordinate:location];
        placemark.title = @"Title Here";
        placemark.subtitle = @"Subtitle Here";
        [mMapView addAnnotation:placemark];
        [placemark release];


 }

    -(CLLocationCoordinate2D) getLocationFromAddress:(NSString*) address {
        // in case of error use api key like
        // http://maps.google.com/maps/geo?q=%@&output=csv&key=YourGoogleMapsAPIKey
        NSString *urlString = [NSString stringWithFormat:@"http://maps.google.com/maps/geo?q=%@&output=csv",[address stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
        NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
        NSArray *listItems = [locationString componentsSeparatedByString:@","];
        double latitude = 0.0;
        double longitude = 0.0;



        if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:@"200"]) {
            latitude = [[listItems objectAtIndex:2] doubleValue];
            longitude = [[listItems objectAtIndex:3] doubleValue];
        }
        else {
            //Show error
            NSLog(@"error:address not found");
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"ERROR" message:@"Address not found"
                                                           delegate:self cancelButtonTitle:@"OK" otherButtonTitles: nil];
            [alert show];
            [alert release];
        }

        CLLocationCoordinate2D location;
        location.latitude = latitude;
        location.longitude = longitude;

        return location;
    }

    #pragma mark search delegate
    - (IBAction)buttonclick:(id)sender
    {

        CLLocationCoordinate2D location2d = [self getLocationFromAddress:textfield.text];
        [self addPins:location2d.latitude lon:location2d.longitude];
        NSLog(@"location latitude  = %f",location2d.latitude);
        NSLog(@"location latitude  = %f",location2d.longitude);
    }
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1 に答える 1

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CLLocationManagerデリゲートで

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
NSLog(@"location found... updating region");
//[self addPins:newLocation.coordinate.latitude lon:newLocation.coordinate.longitude];
}

行[self addPins:newLocation.coordinate.latitude lon:newLocation.coordinate.longitude];にコメントを付けます。現在の場所にズームしているためです。

または-(void)addPins:(float)lat lon:(float)lon関数で、Bool を使用して次の行を 1 回だけ実行します。

if(!executeOnce) // executeOnce is a BOOL
{

MKCoordinateRegion region;
region.center=location;
MKCoordinateSpan span;
span.latitudeDelta=0.5f;
span.longitudeDelta=0.5f;
region.span=span;
[mMapView setRegion:region animated:TRUE];

executeOnce = YES;
}
于 2013-01-02T14:40:12.640 に答える