From 43bcba4cbe2242d1c0aaefbdeed0906600589511 Mon Sep 17 00:00:00 2001
From: Julian Rex <julian.rex@mapbox.com>
Date: Mon, 26 Feb 2018 11:11:27 -0500
Subject: [ios] Release only called if the layer is really being removed from
 the style. Update associated test that failed.

---
 platform/darwin/src/MGLStyleLayer.mm               |  8 ++---
 platform/darwin/test/MGLStyleTests.mm              | 39 +++++++++++++++++-----
 .../ios/Integration Tests/MBGLIntegrationTests.m   |  1 +
 3 files changed, 35 insertions(+), 13 deletions(-)

diff --git a/platform/darwin/src/MGLStyleLayer.mm b/platform/darwin/src/MGLStyleLayer.mm
index 2a70cab563..45a4486525 100644
--- a/platform/darwin/src/MGLStyleLayer.mm
+++ b/platform/darwin/src/MGLStyleLayer.mm
@@ -54,11 +54,11 @@
 {
     if (self.rawLayer == style.rawStyle->getLayer(self.identifier.UTF8String)) {
         _pendingLayer = style.rawStyle->removeLayer(self.identifier.UTF8String);
-    }
 
-    // Pair the retain above, and release self, since we're now removed from the collection
-    CFTypeRef toRelease = (__bridge CFTypeRef)self;
-    CFBridgingRelease(toRelease);
+        // Pair the retain above, and release self, since we're now removed from the collection
+        CFTypeRef toRelease = (__bridge CFTypeRef)self;
+        CFBridgingRelease(toRelease);
+    }
 }
 
 - (void)setVisible:(BOOL)visible
diff --git a/platform/darwin/test/MGLStyleTests.mm b/platform/darwin/test/MGLStyleTests.mm
index 8f610e338c..5ab17dd62e 100644
--- a/platform/darwin/test/MGLStyleTests.mm
+++ b/platform/darwin/test/MGLStyleTests.mm
@@ -359,20 +359,41 @@
 }
 
 - (void)testAddingLayerOfTypeABeforeRemovingLayerOfTypeBWithSameIdentifier {
-    MGLShapeSource *source = [[MGLShapeSource alloc] initWithIdentifier:@"shape-source-identifier" shape:nil options:nil];
-    [self.style addSource:source];
 
-    // Add a fill layer
-    MGLFillStyleLayer *fillLayer = [[MGLFillStyleLayer alloc] initWithIdentifier:@"some-identifier" source:source];
-    [self.style addLayer:fillLayer];
+    __weak MGLFillStyleLayer *weakFillLayer = nil;
+    __weak MGLLineStyleLayer *weakLineLayer = nil;
 
-    // Attempt to remove a line layer with the same identifier as the fill layer
-    MGLLineStyleLayer *lineLayer = [[MGLLineStyleLayer alloc] initWithIdentifier:fillLayer.identifier source:source];
-    [self.style removeLayer:lineLayer];
+    @autoreleasepool {
+
+        MGLShapeSource *source = [[MGLShapeSource alloc] initWithIdentifier:@"shape-source-identifier" shape:nil options:nil];
+        [self.style addSource:source];
+
+        // Add a fill layer
+        MGLFillStyleLayer *fillLayer = [[MGLFillStyleLayer alloc] initWithIdentifier:@"some-identifier" source:source];
+        weakFillLayer = fillLayer;
+
+        [self.style addLayer:fillLayer];
 
-    XCTAssertTrue([[self.style layerWithIdentifier:fillLayer.identifier] isMemberOfClass:[MGLFillStyleLayer class]]);
+        // Attempt to remove a line layer with the same identifier as the fill layer
+        MGLLineStyleLayer *lineLayer = [[MGLLineStyleLayer alloc] initWithIdentifier:fillLayer.identifier source:source];
+        weakLineLayer = lineLayer;
+        [self.style removeLayer:lineLayer];
+
+        // The above remove should fail, and the fill layer should still be there.
+        XCTAssertTrue([[self.style layerWithIdentifier:fillLayer.identifier] isMemberOfClass:[MGLFillStyleLayer class]]);
+
+        // Finally remove the fill layer.
+        [self.style removeLayer:fillLayer];
+
+        fillLayer = nil;
+        lineLayer = nil;
+    }
+
+    XCTAssertNil(weakFillLayer, @"");
+    XCTAssertNil(weakLineLayer, @"");
 }
 
+
 - (NSString *)stringWithContentsOfStyleHeader {
     NSURL *styleHeaderURL = [[[NSBundle mgl_frameworkBundle].bundleURL
                               URLByAppendingPathComponent:@"Headers" isDirectory:YES]
diff --git a/platform/ios/Integration Tests/MBGLIntegrationTests.m b/platform/ios/Integration Tests/MBGLIntegrationTests.m
index 941e73621f..1008ef6c9f 100644
--- a/platform/ios/Integration Tests/MBGLIntegrationTests.m	
+++ b/platform/ios/Integration Tests/MBGLIntegrationTests.m	
@@ -42,6 +42,7 @@
 - (void)tearDown {
     _styleLoadingExpectation = nil;
     self.mapView = nil;
+    self.style = nil;
 
     [super tearDown];
 }
-- 
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