[ios] Add annotation container view (#5194)

Add a container view to hold annotations. This gets around a performance
issue with `UIView:addSubview:` where adding views is N^2. It helps
annotation views avoid cutting into callout views when the annotation
views are transformed to be "flat".

1 files changed, 1 insertions, 1 deletions

diff --git a/platform/ios/app/MBXAnnotationView.m b/platform/ios/app/MBXAnnotationView.m
index 8cbe07a367..890881a316 100644
--- a/platform/ios/app/MBXAnnotationView.m
+++ b/platform/ios/app/MBXAnnotationView.m
@@ -12,7 +12,7 @@
     [super layoutSubviews];
     if (!self.centerView) {
         self.backgroundColor = [UIColor blueColor];
-        self.centerView = [[UIView alloc] initWithFrame:CGRectInset(self.bounds, 5.0, 5.0)];
+        self.centerView = [[UIView alloc] initWithFrame:CGRectInset(self.bounds, 1.0, 1.0)];
         self.centerView.backgroundColor = self.centerColor;
         [self addSubview:self.centerView];
     }