From 5d5321623b65b60e12d7ae0f0792ea2e1e0f7cbb Mon Sep 17 00:00:00 2001
From: Lloyd Sheng <i@lloydsheng.com>
Date: Thu, 22 Feb 2018 10:59:45 +0800
Subject: Remove duplicate sort code and not affetct remembered annotations if
 persist is NO

---
 platform/ios/src/MGLMapView.mm | 57 ++++++++++++++++--------------------------
 1 file changed, 21 insertions(+), 36 deletions(-)

diff --git a/platform/ios/src/MGLMapView.mm b/platform/ios/src/MGLMapView.mm
index 64a5835fb5..14ca32ad67 100644
--- a/platform/ios/src/MGLMapView.mm
+++ b/platform/ios/src/MGLMapView.mm
@@ -4097,68 +4097,53 @@ public:
     MGLAnnotationTag hitAnnotationTag = MGLAnnotationTagNotFound;
     if (nearbyAnnotations.size())
     {
-        // The annotation tags need to be stable in order to compare them with
-        // the remembered tags.
-        std::sort(nearbyAnnotations.begin(), nearbyAnnotations.end());
+        // The first selection in the cycle should be the one nearest to the
+        // tap. Also the annotation tags need to be stable in order to compare them with
+        // the remembered tags _annotationsNearbyLastTap.
+        CLLocationCoordinate2D currentCoordinate = [self convertPoint:point toCoordinateFromView:self];
+        std::sort(nearbyAnnotations.begin(), nearbyAnnotations.end(), [&](const MGLAnnotationTag tagA, const MGLAnnotationTag tagB) {
+            CLLocationCoordinate2D coordinateA = [[self annotationWithTag:tagA] coordinate];
+            CLLocationCoordinate2D coordinateB = [[self annotationWithTag:tagB] coordinate];
+            CLLocationDegrees deltaA = hypot(coordinateA.latitude - currentCoordinate.latitude,
+                                             coordinateA.longitude - currentCoordinate.longitude);
+            CLLocationDegrees deltaB = hypot(coordinateB.latitude - currentCoordinate.latitude,
+                                             coordinateB.longitude - currentCoordinate.longitude);
+            return deltaA < deltaB;
+        });
 
         if (nearbyAnnotations == _annotationsNearbyLastTap)
         {
-            // The first selection in the cycle should be the one nearest to the
-            // tap.
-            CLLocationCoordinate2D currentCoordinate = [self convertPoint:point toCoordinateFromView:self];
-            std::sort(_annotationsNearbyLastTap.begin(), _annotationsNearbyLastTap.end(), [&](const MGLAnnotationTag tagA, const MGLAnnotationTag tagB) {
-                CLLocationCoordinate2D coordinateA = [[self annotationWithTag:tagA] coordinate];
-                CLLocationCoordinate2D coordinateB = [[self annotationWithTag:tagB] coordinate];
-                CLLocationDegrees deltaA = hypot(coordinateA.latitude - currentCoordinate.latitude,
-                                                 coordinateA.longitude - currentCoordinate.longitude);
-                CLLocationDegrees deltaB = hypot(coordinateB.latitude - currentCoordinate.latitude,
-                                                 coordinateB.longitude - currentCoordinate.longitude);
-                return deltaA < deltaB;
-            });
-
             // The last time we persisted a set of annotations, we had the same
             // set of annotations as we do now. Cycle through them.
             if (_selectedAnnotationTag == MGLAnnotationTagNotFound
-                || _selectedAnnotationTag == _annotationsNearbyLastTap.back())
+                || _selectedAnnotationTag == nearbyAnnotations.back())
             {
                 // Either no annotation is selected or the last annotation in
                 // the set was selected. Wrap around to the first annotation in
                 // the set.
-                hitAnnotationTag = _annotationsNearbyLastTap.front();
+                hitAnnotationTag = nearbyAnnotations.front();
             }
             else
             {
-                auto result = std::find(_annotationsNearbyLastTap.begin(),
-                                        _annotationsNearbyLastTap.end(),
+                auto result = std::find(nearbyAnnotations.begin(),
+                                        nearbyAnnotations.end(),
                                         _selectedAnnotationTag);
-                if (result == _annotationsNearbyLastTap.end())
+                if (result == nearbyAnnotations.end())
                 {
                     // An annotation from this set hasn’t been selected before.
                     // Select the first (nearest) one.
-                    hitAnnotationTag = _annotationsNearbyLastTap.front();
+                    hitAnnotationTag = nearbyAnnotations.front();
                 }
                 else
                 {
                     // Step to the next annotation in the set.
-                    auto distance = std::distance(_annotationsNearbyLastTap.begin(), result);
-                    hitAnnotationTag = _annotationsNearbyLastTap[distance + 1];
+                    auto distance = std::distance(nearbyAnnotations.begin(), result);
+                    hitAnnotationTag = nearbyAnnotations[distance + 1];
                 }
             }
         }
         else
         {
-            // The first selection in the cycle should be the one nearest to the
-            // tap.
-            CLLocationCoordinate2D currentCoordinate = [self convertPoint:point toCoordinateFromView:self];
-            std::sort(nearbyAnnotations.begin(), nearbyAnnotations.end(), [&](const MGLAnnotationTag tagA, const MGLAnnotationTag tagB) {
-                CLLocationCoordinate2D coordinateA = [[self annotationWithTag:tagA] coordinate];
-                CLLocationCoordinate2D coordinateB = [[self annotationWithTag:tagB] coordinate];
-                CLLocationDegrees deltaA = hypot(coordinateA.latitude - currentCoordinate.latitude,
-                                                 coordinateA.longitude - currentCoordinate.longitude);
-                CLLocationDegrees deltaB = hypot(coordinateB.latitude - currentCoordinate.latitude,
-                                                 coordinateB.longitude - currentCoordinate.longitude);
-                return deltaA < deltaB;
-            });
             // Remember the nearby annotations for the next time this method is
             // called.
             if (persist)
-- 
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