From df66b7a4d2796c437f86d3d60741280b1f9b2d23 Mon Sep 17 00:00:00 2001
From: Jiayan Zhuang <jiayan0406@fb.com>
Date: Tue, 4 Aug 2020 15:09:44 -0700
Subject: [PATCH] Add UIContentSizeCategoryDidChangeNotification to re-render
 text

Summary:
Changelog:
[Internal] - Add UIContentSizeCategoryDidChangeNotification to re-render text

We don't need to restart the app to re-render text now, but we still need to swipe the screen or click on buttons to force to refresh. We may address this in the future.

Reviewed By: PeteTheHeat

Differential Revision: D22867293

fbshipit-source-id: 4747a45adc2bdc638cf7ef9c07a9484e48600583
---
 React/Fabric/RCTSurfacePresenter.mm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/React/Fabric/RCTSurfacePresenter.mm b/React/Fabric/RCTSurfacePresenter.mm
index 82c1d6a449..4d65ca882b 100644
--- a/React/Fabric/RCTSurfacePresenter.mm
+++ b/React/Fabric/RCTSurfacePresenter.mm
@@ -120,6 +120,11 @@ static BackgroundExecutor RCTGetBackgroundExecutor()
     _observers = [NSMutableArray array];
 
     _scheduler = [self _createScheduler];
+
+    [[NSNotificationCenter defaultCenter] addObserver:self
+                                             selector:@selector(_handleContentSizeCategoryDidChangeNotification:)
+                                                 name:UIContentSizeCategoryDidChangeNotification
+                                               object:nil];
   }
 
   return self;
@@ -425,6 +430,23 @@ static BackgroundExecutor RCTGetBackgroundExecutor()
   }];
 }
 
+- (void)_handleContentSizeCategoryDidChangeNotification:(NSNotification *)notification
+{
+  RCTScheduler *scheduler = [self _scheduler];
+
+  [_surfaceRegistry enumerateWithBlock:^(NSEnumerator<RCTFabricSurface *> *enumerator) {
+    for (RCTFabricSurface *surface in enumerator) {
+      LayoutContext layoutContext = RCTGetLayoutContext();
+
+      LayoutConstraints layoutConstraints = RCTGetLayoutConstraintsForSize(surface.minimumSize, surface.maximumSize);
+
+      [scheduler constraintSurfaceLayoutWithLayoutConstraints:layoutConstraints
+                                                layoutContext:layoutContext
+                                                    surfaceId:surface.rootTag];
+    }
+  }];
+}
+
 #pragma mark - RCTSchedulerDelegate
 
 - (void)schedulerDidFinishTransaction:(MountingCoordinator::Shared const &)mountingCoordinator