From a4c5b4f4b579d321bf3efdeb1ab9fd74075993a8 Mon Sep 17 00:00:00 2001
From: Fabian Guerra <fabian.guerra@mapbox.com>
Date: Tue, 8 Aug 2017 19:21:58 -0400
Subject: =?UTF-8?q?[ios,=20macos]=20Adapt=20Mapbox=20Streets=E2=80=93sourc?=
 =?UTF-8?q?ed=20layers=20for=20Dynamic=20Type.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 platform/darwin/src/MGLStyle.mm        | 26 ++++++++++++++++++++++++++
 platform/darwin/src/MGLStyle_Private.h |  3 +++
 platform/ios/src/MGLMapView.mm         |  7 +++++++
 3 files changed, 36 insertions(+)

diff --git a/platform/darwin/src/MGLStyle.mm b/platform/darwin/src/MGLStyle.mm
index 1e0a2e02b7..8c72c19e42 100644
--- a/platform/darwin/src/MGLStyle.mm
+++ b/platform/darwin/src/MGLStyle.mm
@@ -743,6 +743,32 @@ static NSURL *MGLStyleURL_emerald;
 
         self.localizedLayersByIdentifier = [NSMutableDictionary dictionary];
     }
+    [self setPreferredContentSize:nil];
+}
+
+- (void)setPreferredContentSize:(UIContentSizeCategory)preferredContentSize
+{
+    for (MGLSymbolStyleLayer *layer in self.layers) {
+        if (![layer isKindOfClass:[MGLSymbolStyleLayer class]]) {
+            continue;
+        }
+        
+        MGLVectorSource *source = (MGLVectorSource *)[self sourceWithIdentifier:layer.sourceIdentifier];
+        if (![source isKindOfClass:[MGLVectorSource class]] || !source.mapboxStreets) {
+            continue;
+        }
+
+        if ([layer.textFontSize isKindOfClass:[MGLConstantStyleValue class]]) {
+            NSNumber *textFontSize = [(MGLConstantStyleValue<NSNumber *> *)layer.textFontSize rawValue];
+            textFontSize = [NSNumber numberWithFloat:(textFontSize.floatValue * [self sizeForContentSizeCategory:preferredContentSize])];
+            layer.textFontSize = [MGLStyleValue<NSNumber *> valueWithRawValue:textFontSize];
+        }
+    }
+}
+
+- (CGFloat)sizeForContentSizeCategory:(UIContentSizeCategory)preferredContentSize
+{
+    return 1.3;
 }
 
 @end
diff --git a/platform/darwin/src/MGLStyle_Private.h b/platform/darwin/src/MGLStyle_Private.h
index 23ce8fbee0..6b96540272 100644
--- a/platform/darwin/src/MGLStyle_Private.h
+++ b/platform/darwin/src/MGLStyle_Private.h
@@ -1,4 +1,5 @@
 #import "MGLStyle.h"
+#import <UIKit/UIContentSizeCategory.h>
 
 #import "MGLStyleLayer.h"
 #import "MGLFillStyleLayer.h"
@@ -21,6 +22,8 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)setStyleClasses:(NS_ARRAY_OF(NSString *) *)appliedClasses transitionDuration:(NSTimeInterval)transitionDuration;
 
+- (void)setPreferredContentSize:(UIContentSizeCategory)preferredContentSize;
+
 @end
 
 NS_ASSUME_NONNULL_END
diff --git a/platform/ios/src/MGLMapView.mm b/platform/ios/src/MGLMapView.mm
index 715c32186d..5013e5096c 100644
--- a/platform/ios/src/MGLMapView.mm
+++ b/platform/ios/src/MGLMapView.mm
@@ -563,6 +563,7 @@ public:
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(wakeGL:) name:UIApplicationDidBecomeActiveNotification object:nil];
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didReceiveMemoryWarning) name:UIApplicationDidReceiveMemoryWarningNotification object:nil];
     [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(deviceOrientationDidChange:) name:UIDeviceOrientationDidChangeNotification object:nil];
+    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(preferredContentSizeChanged:) name:UIContentSizeCategoryDidChangeNotification object:nil];
     [[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
 
     // set initial position
@@ -2456,6 +2457,12 @@ public:
     UIAccessibilityPostNotification(UIAccessibilityAnnouncementNotification, self.accessibilityValue);
 }
 
+- (void)preferredContentSizeChanged:(NSNotification *)notification {
+    UIContentSizeCategory preferredContentSize = [notification.userInfo objectForKey:UIContentSizeCategoryNewValueKey];
+    [self.style setPreferredContentSize:preferredContentSize];
+    
+}
+
 #pragma mark - Geography -
 
 + (NS_SET_OF(NSString *) *)keyPathsForValuesAffectingCenterCoordinate
-- 
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