StackOverflow2013

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PO
primarykey
Id
8180605
data
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0
AnswerCount
0
ClosedDate
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1
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CreationDate
2011-11-18T09:56:57.417
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2012-06-13T08:50:21.957
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2012-06-13T08:50:21.957
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1453097
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894671
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8180513
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2
Score
2
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text
Body
I have been using cutom map pin created by Mayur Birari, which i tweaked a little bit, to support custom map pin images and id's. CustomMapPin.h <pre><code>#import <Foundation/Foundation.h> #import <MapKit/MapKit.h> @interface CustomMapPin : NSObject<MKAnnotation> { CLLocationCoordinate2D coordinate; NSString* title; NSString* subtitle; NSString* pic; NSInteger tag_number; } @property (nonatomic, assign) CLLocationCoordinate2D coordinate; @property (nonatomic, copy) NSString* title; @property (nonatomic, copy) NSString* subtitle; @property (nonatomic, copy) NSString* pic; @property (nonatomic) NSInteger tag_number; @end </code></pre> CustomMapPin.m <pre><code>#import "CustomMapPin.h" @implementation CustomMapPin @synthesize title; @synthesize subtitle; @synthesize coordinate; @synthesize pic; @synthesize tag_number; - (void)dealloc { self.title = nil; self.pic = nil; self.subtitle = nil; [super dealloc]; } @end </code></pre> and using it in class like this: <pre><code>CLLocationCoordinate2D pinlocation; </code></pre> in a loop I set up required values and create a map pin: <pre><code>pinlocation.latitude = ...; pinlocation.longitude = ...; NSInteger pinID = ....; CustomMapPin* customMapPin=[[CustomMapPin alloc] init]; customMapPin.coordinate=(CLLocationCoordinate2D {pinlocation.latitude,pinlocation.longitude}; customMapPin.title=@"title"; customMapPin.subtitle=@"subtitle"; customMapPin.pic = @"customImageName"; customMapPin.tag_number = pinId; [mapView addAnnotation:customMapPin]; </code></pre> Setting up custom image: <pre><code>- (MKAnnotationView *) mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>) annotation { if ([annotation isKindOfClass: [CustomMapPin class]]) { CustomMapPin * a = annotation; [annView setImage:[UIImage imageNamed:a.pic]]; } } </code></pre> Getting pin id on callout: <pre><code>- (void)mapView:(MKMapView *)mp annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control { CustomMapPin * v = (CustomMapPin *) view.annotation; int tagNumber = v.tag_number; .... } </code></pre> and finally - in my project It was required to have filter buttons - so I needed to remove all pins, and add required. By default calling mapview to remove all annotations created memory leaks. So when I need to clear mapview from annotations, I call this function: <pre><code>- (void)removeAnnotations { NSMutableArray *toRemove = [NSMutableArray arrayWithCapacity:[mapView.annotations count]]; for (id annotation in mapView.annotations) { if (annotation != mapView.userLocation) { [toRemove addObject:annotation]; } } [mapView removeAnnotations:toRemove]; for(int i = 0; i < [toRemove count]; i++) { CustomMapPin * a = [toRemove objectAtIndex:i]; [a release]; a = nil; } } </code></pre> Hope this helps Happy coding! :)
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1. POremoving/adding annotations to mapview cause memory leaks
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1. USuser1453097
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