iphone - 自定义注释标注视图未正确显示

Question

我的应用程序中有一个自定义注释标注视图。我希望​​ mapview 自动调整，以便注释标注视图始终显示在可见区域内。现在它显示为如图所示。任何解决方案？

Answer 1

这是我对创建注释的回答。

调用以下方法以正确显示地图视图中的所有注释。（创建注解后调用此方法）

[self zoomToFitMapAnnotations:self.mapView];

上述方法的代码

-(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(DDAnnotation* 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);

    }

    NSLog(@"A%f, B%f, C%f, D%f,", topLeftCoord.latitude, topLeftCoord.longitude, bottomRightCoord.latitude, bottomRightCoord.longitude);

    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:region animated:YES];
}