[fix] Fixed Download interface caused the iOS platform to fail to build

CHANGELOG.md

@@ -59,6 +59,7 @@
 
 ## master
 
+* (2022.10.13) 修复`Download`的接口造成`iOS`平台打包失败的问题
 * (2022.10.12) 增加`Animation`的`UnscaledTime`支持设置动画是否受TimeScale的影响 (#223)
 * (2022.10.10) 调整文档格式
 * (2022.10.10) 增加`Line`的`SmoothLimit`可控制平滑曲线不同效果

Runtime/Internal/Utilities/ChartHelper.cs

@@ -898,8 +898,10 @@ namespace XCharts.Runtime
             else return valueOrRate;
         }
 
+#if UNITY_WEBGL
         [DllImport("__Internal")]
         private static extern void Download(string base64str, string fileName);
+#endif
 
         public static Texture2D SaveAsImage(RectTransform rectTransform, Canvas canvas, string imageType = "png", string path = "")
         {