add ios code

ios/ViewManagers/RNSVGTSpanManager.h

@@ -0,0 +1,13 @@
+/**
+ * Copyright (c) 2015-present, Horcrux.
+ * All rights reserved.
+ *
+ * This source code is licensed under the MIT-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "RNSVGRenderableManager.h"
+
+@interface RNSVGTSpanManager : RNSVGRenderableManager
+
+@end

ios/ViewManagers/RNSVGTSpanManager.m

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2015-present, Horcrux.
+ * All rights reserved.
+ *
+ * This source code is licensed under the MIT-style license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#import "RNSVGTSpanManager.h"
+
+#import "RNSVGTSpan.h"
+#import "RCTConvert+RNSVG.h"
+
+@implementation RNSVGTSpanManager
+
+RCT_EXPORT_MODULE()
+
+- (RNSVGRenderable *)node
+{
+  return [RNSVGTSpan new];
+}
+
+RCT_EXPORT_VIEW_PROPERTY(alignment, CTTextAlignment)
+RCT_REMAP_VIEW_PROPERTY(frame, textFrame, RNSVGTextFrame)
+RCT_EXPORT_VIEW_PROPERTY(dx, NSString)
+RCT_EXPORT_VIEW_PROPERTY(dy, NSString)
+
+@end