[ios] Made annotation view position animatable

We don’t normally want an annotation view to animate its position, because that makes the view appear to lag behind the map. But when the annotation view moves due to the underlying annotation model object moving, the developer may want exactly that effect.

This change continues to disable the default implicit bounds (and now position) animation. It also groups the view updates in -updateAnnotationViews in a transaction that disables animation actions, to improve perceived performance with a large number of annotations. However, when the annotation model object changes, we move the annotation view outside of that transaction to allow the developer to opt into animation.

If the developer moreover wants the annotation view to animate even due to the viewport changing, they can override -setCenter: to use a UIView animation block.

Fixes #5230.

1 files changed, 1 insertions, 1 deletions

diff --git a/platform/ios/src/MGLAnnotationView.mm b/platform/ios/src/MGLAnnotationView.mm
index a1e93de108..494253b561 100644
--- a/platform/ios/src/MGLAnnotationView.mm
+++ b/platform/ios/src/MGLAnnotationView.mm
@@ -243,7 +243,7 @@
 - (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event
 {
     // Allow mbgl to drive animation of this view’s bounds.
-    if ([event isEqualToString:@"bounds"])
+    if ([event isEqualToString:@"bounds"] || [event isEqualToString:@"position"])
     {
         return [NSNull null];
     }