地圖開發常用代碼

1、//更新地圖可見地區，讓所有公交網站在地圖可見地區

- (void)updateMapviewVisibleRegion {

    

    MKMapRect zoomRect =
MKMapRectNull;

   
for (id <MKAnnotation> annotation
in self.mapView.annotations) {

       
MKMapPoint annotationPoint =
MKMapPointForCoordinate(annotation.coordinate);

       
MKMapRect pointRect =
MKMapRectMake(annotationPoint.x, annotationPoint.y,
0, 0);

       
if (MKMapRectIsNull(zoomRect)) {

            zoomRect = pointRect;

        }
else {

            zoomRect =
MKMapRectUnion(zoomRect, pointRect);

        }

    }

    zoomRect = [self.mapView
mapRectThatFits:zoomRect];

    [self.mapView
setVisibleMapRect:zoomRect animated:YES];

    

}

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id
< MKAnnotation >)annotation {

    

    //判斷是否是自身位置

   
if ([annotation isKindOfClass:[MKUserLocation
class]]) {

        

       
return nil;

    }

    

    

    //驗證參數

   
if (![annotation isKindOfClass:[ZPMKAnnotation
class]]) {

        

       
return nil;

        

    }

    

    static
NSString *strIdentifier =
@"MapViewRouteAnnotationViewIdentifier";

   
MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView
dequeueReusableAnnotationViewWithIdentifier:strIdentifier];

   
if (nil == pinView) {

        

        pinView = [[[MKPinAnnotationView
alloc] initWithAnnotation:annotation
reuseIdentifier:strIdentifier]
autorelease]; 

        pinView.tag = ((ZPMKAnnotation *)annotation).stationID;

        pinView.pinColor =
MKPinAnnotationColorGreen;

        pinView.canShowCallout =
YES;

        pinView.rightCalloutAccessoryView = [UIButton
buttonWithType:UIButtonTypeDetailDisclosure];

        pinView.draggable =
YES;

        

    }else {

        

        pinView.annotation = annotation;

    }

    

    

    

   
return pinView;

}

2、在地圖上畫線

//更新地圖可見地區，讓所有公交網站在地圖可見地區

- (void)updateMapviewVisibleRegion {

    

    MKMapRect zoomRect =
MKMapRectNull;

   
for (id <MKAnnotation> annotation
in self.mapView.annotations) {

       
MKMapPoint annotationPoint =
MKMapPointForCoordinate(annotation.coordinate);

       
MKMapRect pointRect =
MKMapRectMake(annotationPoint.x, annotationPoint.y,
0, 0);

       
if (MKMapRectIsNull(zoomRect)) {

            zoomRect = pointRect;

        }
else {

            zoomRect =
MKMapRectUnion(zoomRect, pointRect);

        }

    }

    zoomRect = [self.mapView
mapRectThatFits:zoomRect];

    [self.mapView
setVisibleMapRect:zoomRect animated:YES];

    

}

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay 
{

    

   
if(overlay == self.routeLine) {  

    

        self.routeLineView = [[[MKPolylineView
alloc] initWithPolyline:self.routeLine]
autorelease];  

       
self.routeLineView.fillColor = [UIColor
blueColor];  

       
self.routeLineView.strokeColor = [UIColor
blueColor];  

       
self.routeLineView.lineWidth =
5;  

        

       
return self.routeLineView;  

    }  

    return
nil;  

}