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#import "SelectFeatureExample.h"
@import Mapbox;
NSString *const MBXExampleSelectFeature = @"SelectFeatureExample";
@interface SelectFeatureExample () <MGLMapViewDelegate>
@property (nonatomic) MGLMapView *mapView;
@property (nonatomic) MGLShapeSource *selectedFeaturesSource;
@end
@implementation SelectFeatureExample
- (void)viewDidLoad {
[super viewDidLoad];
MGLMapView *mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
[mapView setCenterCoordinate:CLLocationCoordinate2DMake(45.5076, -122.6736)
zoomLevel:11
animated:NO];
// Add our own gesture recognizer to handle taps on our custom map features
[mapView addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(didTapMap:)]];
mapView.delegate = self;
[self.view addSubview:mapView];
self.mapView = mapView;
}
- (void)mapView:(MGLMapView *)mapView didFinishLoadingStyle:(MGLStyle *)style {
// Create a placeholder MGLShapeSource that will hold copies of any features we’ve selected.
MGLShapeSource *source = [[MGLShapeSource alloc] initWithIdentifier:@"selected-features" features:@[] options:nil];
[style addSource:source];
// Keep a reference to the source so we can update it when the map is tapped.
self.selectedFeaturesSource = source;
// Color any selected features red on the map.
MGLFillStyleLayer *selectedFeaturesLayer = [[MGLFillStyleLayer alloc] initWithIdentifier:@"selected-features" source:source];
selectedFeaturesLayer.fillColor = [MGLStyleValue valueWithRawValue:[UIColor redColor]];
[style addLayer:selectedFeaturesLayer];
}
- (void)didTapMap:(UITapGestureRecognizer *)recognizer {
if (recognizer.state == UIGestureRecognizerStateEnded) {
// A tap’s center coordinate may not intersect a feature exactly, so let’s make a 44x44 rect that represents a touch and select all features that interesect.
CGRect pointRect = { [recognizer locationInView:recognizer.view], CGSizeZero };
CGRect touchRect = CGRectInset(pointRect, -22.0, -22.0);
// Let’s only select parks near the rect. There’s a layer within the Mapbox Streets style with "id" = "park". You can see all of the layers used within the default mapbox styles by creating a new style using Mapbox Studio.
NSSet *layerIdentifiers = [NSSet setWithObject:@"park"];
// Query the current mapview for any features that intersect our rect.
NSMutableArray *features = [NSMutableArray array];
for (id f in [self.mapView visibleFeaturesInRect:touchRect inStyleLayersWithIdentifiers:layerIdentifiers]) {
[features addObject:f];
}
MGLShapeCollectionFeature *shapes = [MGLShapeCollectionFeature shapeCollectionWithShapes:features];
// Update our MGLShapeSource to match our selected features.
self.selectedFeaturesSource.shape = shapes;
}
}
@end
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