From 49a892e52ccf465ac0c56be2c71ca8812641c49a Mon Sep 17 00:00:00 2001
From: Mikael Sand <msand@abo.fi>
Date: Thu, 9 Aug 2018 21:24:09 +0300
Subject: [PATCH] [ios] Fix substring range length calculation for unicode
 emoji.

---
 ios/Text/RNSVGTSpan.m | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ios/Text/RNSVGTSpan.m b/ios/Text/RNSVGTSpan.m
index decd8d52..90f0d5c7 100644
--- a/ios/Text/RNSVGTSpan.m
+++ b/ios/Text/RNSVGTSpan.m
@@ -815,7 +815,8 @@ static double RNSVGTSpan_radToDeg = 180 / M_PI;
             if (width == 0) { // Render unicode emoji
                 UILabel *label = [[UILabel alloc] init];
                 CFIndex startIndex = indices[g];
-                NSString* currChars = [str substringWithRange:NSMakeRange(startIndex, MAX(1, endIndex - startIndex))];
+                NSUInteger len = endIndex == startIndex ? n - startIndex : MAX(1, endIndex - startIndex);
+                NSString* currChars = [str substringWithRange:NSMakeRange(startIndex, len)];
                 label.text = currChars;
                 label.opaque = NO;
                 label.backgroundColor = UIColor.clearColor;