[ios] added demo projectupstream/jk-nb-pod-try

1 files changed, 80 insertions, 0 deletions

diff --git a/platform/ios/demo/Examples/ObjectiveC/DrawingAGeoJSONLineExample.m b/platform/ios/demo/Examples/ObjectiveC/DrawingAGeoJSONLineExample.m
new file mode 100644
index 0000000000..2b6cd88f47
--- /dev/null
+++ b/platform/ios/demo/Examples/ObjectiveC/DrawingAGeoJSONLineExample.m
@@ -0,0 +1,80 @@
+#import "DrawingAGeoJSONLineExample.h"
+@import Mapbox;
+
+NSString *const MBXExampleDrawingAGeoJSONLine = @"DrawingAGeoJSONLineExample";
+
+@interface DrawingAGeoJSONLineExample () <MGLMapViewDelegate>
+@property (nonatomic) MGLMapView *mapView;
+@end
+
+@implementation DrawingAGeoJSONLineExample
+
+- (void)viewDidLoad {
+    [super viewDidLoad];
+    
+    self.mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
+    self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
+    
+    // Set the map's center coordinate
+    [self.mapView setCenterCoordinate:CLLocationCoordinate2DMake(45.5076, -122.6736)
+                            zoomLevel:11
+                             animated:NO];
+    
+    [self.view addSubview:self.mapView];
+    
+    // Set the delegate property of our map view to self after instantiating it.
+    self.mapView.delegate = self;
+
+    [self drawPolyline];
+}
+
+- (void)drawPolyline {
+    // Perform GeoJSON parsing on a background thread
+    dispatch_queue_t backgroundQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
+    dispatch_async(backgroundQueue, ^(void) {
+        // Get the path for example.geojson in the app's bundle
+        NSString *jsonPath = [[NSBundle mainBundle] pathForResource:@"example" ofType:@"geojson"];
+        
+        // Convert the file contents to a shape collection feature object
+        NSData *data = [[NSData alloc] initWithContentsOfFile:jsonPath];
+        MGLShapeCollectionFeature *shapeCollectionFeature = (MGLShapeCollectionFeature *)[MGLShape shapeWithData:data encoding:NSUTF8StringEncoding error:NULL];
+        
+        MGLPolylineFeature *polyline = (MGLPolylineFeature *)shapeCollectionFeature.shapes.firstObject;
+        
+        // Optionally set the title of the polyline, which can be used for:
+        //  - Callout view
+        //  - Object identification
+        // In this case, set it to the name included in the GeoJSON
+        polyline.title = polyline.attributes[@"name"]; // "Crema to Council Crest"
+        
+        // Add the polyline to the map, back on the main thread
+        // Use weak reference to self to prevent retain cycle
+        __weak typeof(self) weakSelf = self;
+        dispatch_async(dispatch_get_main_queue(), ^(void) {
+            [weakSelf.mapView addAnnotation:polyline];
+        });
+    });
+}
+
+- (CGFloat)mapView:(MGLMapView *)mapView alphaForShapeAnnotation:(MGLShape *)annotation {
+    // Set the alpha for all shape annotations to 1 (full opacity)
+    return 1.0f;
+}
+
+- (CGFloat)mapView:(MGLMapView *)mapView lineWidthForPolylineAnnotation:(MGLPolyline *)annotation {
+    // Set the line width for polyline annotations
+    return 2.0f;
+}
+
+- (UIColor *)mapView:(MGLMapView *)mapView strokeColorForShapeAnnotation:(MGLShape *)annotation {
+    // Set the stroke color for shape annotations
+    // ... but give our polyline a unique color by checking for its `title` property
+    if ([annotation.title isEqualToString:@"Crema to Council Crest"]) {
+        // Mapbox cyan
+        return [UIColor colorWithRed:59.0f/255.0f green:178.0f/255.0f blue:208.0f/255.0f alpha:1.0f];
+    } else {
+        return [UIColor redColor];
+    }
+}
+
+@end