attributes for setting alignment in SGText

Reviewed By: kukulski

Differential Revision: D2483597

fb-gh-sync-id: 003592b55b98af7a350f4789f3199b4e6d5f2c22

React/Base/RCTConvert.h

@@ -56,6 +56,7 @@ typedef NSURL RCTFileURL;
 + (NSTimeZone *)NSTimeZone:(id)json;
 + (NSTimeInterval)NSTimeInterval:(id)json;
 
++ (NSLineBreakMode)NSLineBreakMode:(id)json;
 + (NSTextAlignment)NSTextAlignment:(id)json;
 + (NSUnderlineStyle)NSUnderlineStyle:(id)json;
 + (NSWritingDirection)NSWritingDirection:(id)json;

React/Base/RCTConvert.m

@@ -205,6 +205,15 @@ NSNumber *RCTConvertMultiEnumValue(const char *typeName, NSDictionary *mapping,
   return RCTConvertEnumValue(typeName, mapping, defaultValue, json);
 }
 
+RCT_ENUM_CONVERTER(NSLineBreakMode, (@{
+  @"wordWrapping": @(NSLineBreakByWordWrapping),
+  @"charWrapping": @(NSLineBreakByCharWrapping),
+  @"clipping": @(NSLineBreakByClipping),
+  @"truncatingHead": @(NSLineBreakByTruncatingHead),
+  @"truncatingTail": @(NSLineBreakByTruncatingTail),
+  @"truncatingMiddle": @(NSLineBreakByTruncatingMiddle),
+}), NSLineBreakByWordWrapping, integerValue)
+
 RCT_ENUM_CONVERTER(NSTextAlignment, (@{
   @"auto": @(NSTextAlignmentNatural),
   @"left": @(NSTextAlignmentLeft),