MKMapView如何更改用户最近位置的PIN图像？

Question

我想在地图视图中更改用户最近的位置图钉图像。

“在我的项目中，我在地图视图中显示了一些商店的位置，位置（lat，long）从api中获得，在这里我更改了给定的位置pin图像，但它工作正常。在地图视图中更改用户最近位置的PIN图像我已经从用户当前位置获得距离详细信息，以指定位置在5英里以下的位置，这些位置的PIN图像需要更改“

这里是我的注释代码：

//查看注释代表代码以更改针图像。

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

[self.annotationCustom_View removeFromSuperview]; 
[self.annotationCurrentLoc_View removeFromSuperview]; 

static NSString *identifier = @"myAnnotation"; 
CustomMapViewAnnotation * annotationView = (CustomMapViewAnnotation *)[self.locationsMap_View dequeueReusableAnnotationViewWithIdentifier:identifier]; 
if (!annotationView) 
{ 
    annotationView = [[CustomMapViewAnnotation alloc] initWithAnnotation:annotation reuseIdentifier:identifier]; 

    if([annotation isKindOfClass:[MKUserLocation class]]) 
    { 
     annotationView.image = [UIImage imageNamed:@"LocationsYour-Current-Location-Icon"]; // User Current Location Image 
    } 
    else 
    { 
dispatch_async(dispatch_get_main_queue(), ^{ 


     for(int i=0;i<[locations_ArrayList count];i++) 
     { 
       MapViewLocationModel *objValue=[locations_ArrayList objectAtIndex:i]; 

      float value = [objValue.kiosk_distance floatValue]; 
       if(value < 5.0) 
       { 

       annotationView.image = [UIImage imageNamed:@"LocationsFridge-Location-Icon"]; // Change the pin image which are the below 5.0 miles distance from the user current locations 

       } 
       else 
       { 
        annotationView.image = [UIImage imageNamed:@"LocationsBlackDot"];  // given api locations pin images 
       } 
     } 


    }); 
     } 
} 

annotationView.canShowCallout = NO; 

return annotationView; 

    } 

这是我的代码。任何人都可以帮助我呢？

Answer 1

尝试以下操作：

为了显示在特定地图区域，引脚，首先你需要 得到5英里内的所有引脚。

// 1. Set the map zoom area visible of 5 miles: 

     mapView.region = MKCoordinateRegionMakeWithDistance(
      centerCoordinate, 
      1609.344f * miles (5 in your case), 
      1609.344f * miles (5 in your case) 
     ); 

    // 2. Now get the Rect of this map area: 

     MKMapRect mRect = self.map.visibleMapRect; 

    // 3. Get the all pins inside this Rect: 

     NSSet *annotationSet = [myMapView annotationsInMapRect:mRect]; 

     // print number of annotations 
     NSLog(@"Number of annotations in rect: %d", annotationSet.count); 

     // this will return an array from the NSSet 
     NSArray *annotationArray = [annotationSet allObjects]; 

    // 4. Assign some parameter to this annotation, by taking some property in the annotation class. 

    // 5. Now in your MapView Delegate method viewForAnnotation check the parameter and do the need full with the respective pins. 

希望这将帮助你实现你想要的。