4 files changed, 55 insertions, 3 deletions
diff --git a/platform/darwin/src/MGLStyle.h b/platform/darwin/src/MGLStyle.h
index 9bd35142c2..25096748f6 100644
--- a/platform/darwin/src/MGLStyle.h
+++ b/platform/darwin/src/MGLStyle.h
@@ -442,6 +442,22 @@ MGL_EXPORT
  */
 - (void)removeImageForName:(NSString *)name;
 
+#pragma mark Managing a Style’s Transition Options
+
+/**
+ The duration in seconds to animate any changes to the style URL or to layout and paint attributes.
+ 
+ By default, this property is set to zero seconds, so any changes take effect without animation.
+ */
+@property (nonatomic) NSTimeInterval transitionDuration;
+
+/**
+ The delay in seconds to before applying any changes to the style URL or to layout and paint attributes.
+
+ By default, this property is set to zero seconds, so any changes begin to animate immediately.
+ */
+@property (nonatomic) NSTimeInterval transitionDelay;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/platform/darwin/src/MGLStyle.mm b/platform/darwin/src/MGLStyle.mm
index 7e96c08ccc..78c719050c 100644
--- a/platform/darwin/src/MGLStyle.mm
+++ b/platform/darwin/src/MGLStyle.mm
@@ -502,7 +502,7 @@ static NSURL *MGLStyleURL_emerald;
         newAppliedClasses.push_back([appliedClass UTF8String]);
     }
 
-    mbgl::style::TransitionOptions transition { { MGLDurationInSeconds(transitionDuration) } };
+    mbgl::style::TransitionOptions transition { { MGLDurationInSecondsFromTimeInterval(transitionDuration) } };
     self.mapView.mbglMap->setTransitionOptions(transition);
     self.mapView.mbglMap->setClasses(newAppliedClasses);
 }
@@ -570,6 +570,34 @@ static NSURL *MGLStyleURL_emerald;
     return spriteImage ? [[MGLImage alloc] initWithMGLSpriteImage:spriteImage] : nil;
 }
 
+#pragma mark Style transitions
+
+- (void)setTransitionDuration:(NSTimeInterval)duration
+{
+    auto transitionOptions = self.mapView.mbglMap->getTransitionOptions();
+    transitionOptions.duration = MGLDurationInSecondsFromTimeInterval(duration);
+    self.mapView.mbglMap->setTransitionOptions(transitionOptions);
+}
+
+- (NSTimeInterval)transitionDuration
+{
+    const mbgl::style::TransitionOptions transitionOptions = self.mapView.mbglMap->getTransitionOptions();
+    return MGLTimeIntervalFromDurationInSeconds(transitionOptions.duration.value_or(mbgl::Duration::zero()));
+}
+
+- (void)setTransitionDelay:(NSTimeInterval)delay
+{
+    auto transitionOptions = self.mapView.mbglMap->getTransitionOptions();
+    transitionOptions.delay = MGLDurationInSecondsFromTimeInterval(delay);
+    self.mapView.mbglMap->setTransitionOptions(transitionOptions);
+}
+
+- (NSTimeInterval)transitionDelay
+{
+    const mbgl::style::TransitionOptions transitionOptions = self.mapView.mbglMap->getTransitionOptions();
+    return MGLTimeIntervalFromDurationInSeconds(transitionOptions.delay.value_or(mbgl::Duration::zero()));
+}
+
 - (NSString *)description
 {
     return [NSString stringWithFormat:@"<%@: %p; name = %@, URL = %@>",
diff --git a/platform/darwin/src/NSDate+MGLAdditions.h b/platform/darwin/src/NSDate+MGLAdditions.h
index 918aae233f..820d1bd9e2 100644
--- a/platform/darwin/src/NSDate+MGLAdditions.h
+++ b/platform/darwin/src/NSDate+MGLAdditions.h
@@ -5,6 +5,9 @@
 @interface NSDate (MGLAdditions)
 
 /// Converts from a duration in seconds to a duration object usable in mbgl.
-mbgl::Duration MGLDurationInSeconds(NSTimeInterval duration);
+mbgl::Duration MGLDurationInSecondsFromTimeInterval(NSTimeInterval duration);
+
+/// Converts from an mbgl duration object to a duration in seconds.
+NSTimeInterval MGLTimeIntervalFromDurationInSeconds(mbgl::Duration duration);
 
 @end
diff --git a/platform/darwin/src/NSDate+MGLAdditions.mm b/platform/darwin/src/NSDate+MGLAdditions.mm
index 75072ad7ff..deac3c4881 100644
--- a/platform/darwin/src/NSDate+MGLAdditions.mm
+++ b/platform/darwin/src/NSDate+MGLAdditions.mm
@@ -2,9 +2,14 @@
 
 @implementation NSDate (MGLAdditions)
 
-mbgl::Duration MGLDurationInSeconds(NSTimeInterval duration)
+mbgl::Duration MGLDurationInSecondsFromTimeInterval(NSTimeInterval duration)
 {
     return std::chrono::duration_cast<mbgl::Duration>(std::chrono::duration<NSTimeInterval>(duration));
 }
 
+NSTimeInterval MGLTimeIntervalFromDurationInSeconds(mbgl::Duration duration)
+{
+    return duration.count();
+}
+
 @end