[ios] Add iOS bindings and example for missing icons event. (#14302)

Added a new mapView delegate method that allows reload a style icon in case it couldn't load it from the style.

Added an iosapp test example.

1 files changed, 14 insertions, 0 deletions

diff --git a/platform/ios/src/MGLMapView.mm b/platform/ios/src/MGLMapView.mm
index 813762c499..715929818f 100644
--- a/platform/ios/src/MGLMapView.mm
+++ b/platform/ios/src/MGLMapView.mm
@@ -6827,6 +6827,20 @@ public:
     void onDidFinishLoadingStyle() override {
         [nativeView didFinishLoadingStyle];
     }
+    
+    void onStyleImageMissing(const std::string& imageIdentifier) override {
+        NSString *imageName = [NSString stringWithUTF8String:imageIdentifier.c_str()];
+        
+        if ([nativeView.delegate respondsToSelector:@selector(mapView:didFailToLoadImage:)]) {
+            UIImage *imageToLoad = [nativeView.delegate mapView:nativeView didFailToLoadImage:imageName];
+            
+            if (imageToLoad) {
+                auto image = [imageToLoad mgl_styleImageWithIdentifier:imageName];
+                nativeView.mbglMap.getStyle().addImage(std::move(image));
+            }
+            
+        }
+    }
 
     mbgl::gl::ProcAddress getExtensionFunctionPointer(const char* name) override {
         static CFBundleRef framework = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.opengles"));