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以下是我用来加载地图视图的代码。

- (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];
}];

}

我需要调用该方法[self zoomToFitMapAnnotations:mapView withArray:annotationPointsArray]; 以最大缩放级别适合地图视图中的所有联系人。直到之前的实现我已经成功地使用了下面的代码。但是由于我现在使用块，所以我对何时调用此方法有点困惑。在调用此方法并将数组传递给它之前，我需要获取所有位置坐标。

-(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];
}

上面这段代码中调用上述方法的正确位置在哪里，或者我是否需要找到其他方法来执行此操作。

编辑：我避免使用并直接从方法中mapCenter访问坐标，我做对了，问题就解决了。但是我仍然很困惑，为什么第一种方法不起作用。placeInfogetLatLongCoordinates

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2 回答 2

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我在我的情况下使用这种方法

通常我在我的mapview中添加注释后调用这个方法。所以最好的方法是在将annotationView添加到mapview之后调用这个方法。

于 2013-03-21T05:49:14.633 回答
0

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：加载注释后调用此函数

[self zoomToFitMapAnnotations:mapView];
于 2013-03-21T05:55:17.040 回答