Unity --- 设置选择的图片的格式

 static void Setting(string assetPath, int maxSize, TextureImporterFormat androidFormat, TextureImporterFormat iosFormat)
 {
     var texImporter = AssetImporter.GetAtPath(assetPath) as TextureImporter;
     {
         texImporter.npotScale = TextureImporterNPOTScale.ToNearest;
         texImporter.isReadable = false;
         texImporter.mipmapEnabled = false;
         texImporter.alphaIsTransparency = true;
         texImporter.wrapMode = TextureWrapMode.Clamp;
         texImporter.filterMode = FilterMode.Bilinear;
         texImporter.anisoLevel = ;    //纹理的各向异性滤波水平
         texImporter.SetPlatformTextureSettings("Android", maxSize, androidFormat);
         texImporter.SetPlatformTextureSettings("iPhone", maxSize, iosFormat);
         texImporter.SetPlatformTextureSettings("Standalone", maxSize, TextureImporterFormat.ARGB32);
     }

     AssetDatabase.ImportAsset(assetPath);
     AssetDatabase.SaveAssets();
 }