Question

以下是我用来加载mapview的代码。

- (void)getLatLongCoordinates:(NSString*) addressStr firstNameTitle:(NSString*) firstNamesTitle lastNameTitle:(NSString*) lastNamesTitle       { 
MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init];
[geocoder geocodeAddressString:addressStr completionHandler:^(NSArray *placemarks, NSError *error) {
    self.placemarksArray = placemarks;
    CLPlacemark *placeInfo = [placemarks objectAtIndex:0];

    mapCenter.latitude = placeInfo.location.coordinate.latitude;
    mapCenter.longitude = placeInfo.location.coordinate.latitude;
    [annotationPoint setCoordinate:mapCenter];

    [annotationPointsArray addObject:annotationPoint];

    addAnnotation = [[[MyAddressAnnotation alloc] initWithCoordinate:mapCenter title:firstNamesTitle SubTitle:lastNamesTitle ]autorelease];
    addAnnotation.firstNameTitle = firstNamesTitle;
    addAnnotation.lastNameTitle = lastNamesTitle;

[mapView addAnnotation:addAnnotation];
}];

}

我需要调用方法[self zoomToFitMapAnnotations:mapView withArray:annotationPointsArray];以适应mapview中最大缩放级别的所有联系人。直到以前的实现，我已成功使用以下代码。但由于我现在正在使用块，我对何时调用此方法感到有点困惑。我需要在调用此方法之前获取所有位置坐标并将数组传递给它。

-(void)zoomToFitMapAnnotations:(MKMapView*)mapViews withArray:(NSArray*)anAnnotationArray
{
if([mapViews.annotations count] == 0) return;

CLLocationCoordinate2D topLeftCoord;
topLeftCoord.latitude = -90;
topLeftCoord.longitude = 180;

CLLocationCoordinate2D bottomRightCoord;
bottomRightCoord.latitude = 90;
bottomRightCoord.longitude = -180;



for(MKPointAnnotation* annotation in anAnnotationArray)
{
    topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
    topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);

    bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
    bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
}

MKCoordinateRegion region;
region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5;
region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5;
region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1;     
region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1; 

region = [mapViews regionThatFits:region];
[mapView setRegion:region animated:NO];
}

在上面的代码中，调用上述方法的位置在哪里，或者我需要找到其他方法来执行此操作。

编辑：我避免使用mapCenter并直接从placeInfo方法getLatLongCoordinates访问坐标，我正确并且问题已解决。但我仍然感到困惑，为什么第一种方式不起作用。

Answer 1

我在我的案例中使用这种方法

我在mapview中添加注释后通常会调用此方法。因此，最好的方法是在将注释添加到mapVIEW之后调用此方法。

Answer 2

使用此代码zoomToFitMapAnnotations

-(void)zoomToFitMapAnnotations:(MKMapView*)mapView_
{
    if([mapView_.annotations count] == 0)
        return;

    CLLocationCoordinate2D topLeftCoord;
    topLeftCoord.latitude = -90;
    topLeftCoord.longitude = 180;

    CLLocationCoordinate2D bottomRightCoord;
    bottomRightCoord.latitude = 90;
    bottomRightCoord.longitude = -180;

    for(CKMapAnnotationView* annotation in mapView_.annotations)
    {
        topLeftCoord.longitude = fmin(topLeftCoord.longitude, annotation.coordinate.longitude);
        topLeftCoord.latitude = fmax(topLeftCoord.latitude, annotation.coordinate.latitude);

        bottomRightCoord.longitude = fmax(bottomRightCoord.longitude, annotation.coordinate.longitude);
        bottomRightCoord.latitude = fmin(bottomRightCoord.latitude, annotation.coordinate.latitude);
    }
    MKCoordinateRegion region;
    region.center.latitude = topLeftCoord.latitude - (topLeftCoord.latitude - bottomRightCoord.latitude) * 0.5;
    region.center.longitude = topLeftCoord.longitude + (bottomRightCoord.longitude - topLeftCoord.longitude) * 0.5;
    region.span.latitudeDelta = fabs(topLeftCoord.latitude - bottomRightCoord.latitude) * 1.1;
    region.span.longitudeDelta = fabs(bottomRightCoord.longitude - topLeftCoord.longitude) * 1.1;

    region = [mapView_ regionThatFits:region];


    [mapView_ setRegion:[self validRegion:region] animated:YES];
}

编辑：在加载注释后调用此函数

[self zoomToFitMapAnnotations:mapView];

转发地理编码和缩放以适应多个位置

2 个答案: