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 = 4;    //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();
}