StackOverflow2013

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12592892
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2012-09-26T00:15:31.213
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2014-07-26T17:26:10.053
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2014-07-26T17:26:10.053
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5007765
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5
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text
Body
<p>I had a case where I wanted something like a standard Pin annotation, but the designer wanted a custom graphic.</p> <p>I wrote a subclass of <code>MKAnnotationView</code> to display the graphic. The only difference is that it overrides the standard class's <code>image</code>.</p> <h1>BlipAnnotationView.h</h1> <pre><code>#import <MapKit/MapKit.h> @interface BlipAnnotationView : MKAnnotationView - (id)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier; @end </code></pre> <h1>BlipAnnotationView.m</h1> <pre><code>#import "BlipAnnotationView.h" @implementation BlipAnnotationView - (id)initWithAnnotation:(id<MKAnnotation>)annotation reuseIdentifier:(NSString *)reuseIdentifier { self = [super initWithAnnotation:annotation reuseIdentifier:reuseIdentifier]; if (self) { UIImage *blipImage = [UIImage imageNamed:@"blip.png"]; CGRect frame = [self frame]; frame.size = [blipImage size]; [self setFrame:frame]; [self setCenterOffset:CGPointMake(0.0, -7.0)]; [self setImage:blipImage]; } return self; } @end </code></pre> <p>Then in the class that displays the map, I made the class implement the <code>MKMapViewDelegate</code> protocol. The <code>mapView:viewForAnnotation:</code> method creates a new instance of <code>BlipAnnotationView</code> if necessary.</p> <pre><code>- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation { NSLog(@"mapView:%@ viewForAnnotation:%@", mapView, annotation); static NSString *const kAnnotationIdentifier = @"BlipMapAnnotation"; BlipAnnotationView *annotationView = (BlipAnnotationView *) [mapView dequeueReusableAnnotationViewWithIdentifier:kAnnotationIdentifier]; if (! annotationView) { annotationView = [[BlipAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:kAnnotationIdentifier]; } [annotationView setAnnotation:annotation]; return annotationView; } </code></pre> <p>Finally I set the class as the delegate of the map view in <code>awakeFromNib</code>:</p> <pre><code>- (void)awakeFromNib { [...] [_theMapView setDelegate:self]; } </code></pre> <p>I didn't have to change the code that positioned the annotation at all:</p> <pre><code>MKPointAnnotation *annotationPoint = [[MKPointAnnotation alloc] init]; [annotationPoint setCoordinate:[userLocation coordinate]]; [annotationPoint setTitle:label]; [_theMapView addAnnotation:annotationPoint]; </code></pre>
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1. POMKMapView with custom MKAnnotation
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1. USGustavo Barbosa
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1. USDavid Hull
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