如何在不使用MKMapView的情况下放大didAddAnnotationViews？

Question

我试图找到一种方法，通过按钮进行放大和输出。如果我将代码放入方法didAddAnnotationViews中，它将完美地设置初始缩放。我试着用下面的代码来改变变焦，但是它不停地说：

发送到实例的

未识别的选择器

如何在IBAction中运行此操作？

-(IBAction)ZoomIn:(MKCoordinateSpan)coordinateSpanWithMapView:(MKMapView *)mv centerCoordinate:(CLLocationCoordinate2D)location
{
   MKCoordinateRegion region;
   MKCoordinateSpan span; 
   span.latitudeDelta=0.05;
   span.longitudeDelta=0.05;
   location = mv.userLocation.coordinate;
   location = mv.userLocation.location.coordinate;
   region.span=span;
   region.center=location;
   [mv setRegion:region animated:TRUE];
   [mv regionThatFits:region]; 
};

Answer 1

我的问题是，我试图在IBAction行中传递IBAction，而这是我做不到的。它不知道该怎么处理它。我在代码中引用了我的MapView，而不是试图在方法中传递它.

CLLocationCoordinate2D location;
MKCoordinateRegion region;
MKCoordinateSpan span; 
span.latitudeDelta=1.00;
span.longitudeDelta=1.00;
location = self.myMap.userLocation.coordinate;
location = self.myMap.userLocation.location.coordinate;
region.span=span;
region.center=location;
[self.LightUpMap setRegion:region animated:TRUE];
[self.LightUpMap regionThatFits:region];

您现在可以将这是任何IBAction方法，它将放大到地图。

Answer 2

-(void)zoomOut:btnMinus
{
  MKCoordinateSpan span = mapView.region.span;
  span.latitudeDelta = span.latitudeDelta * 2;
  span.longitudeDelta = span.longitudeDelta * 2;
  region.span=span;
  [mapView setRegion:region animated:YES];
  for(int j=2;j<count;j++)
  { places[j]=1;}
  [self filterAnnotations];  
}