unity assetBundle使用image材质

1.  buildassetBundle时放在Resources下

BuildPipeline.BuildAssetBundle(
AssetDatabase.LoadMainAssetAtPath(" Assets/Resources/element.png"),

null, "Assets/Resources/element.unity3d", BuildAssetBundleOptions.CollectDependencies | BuildAssetBundleOptions.CompleteAssets);

2. 跟集成开发环境下使用Resources下图片一样使用 

Resources.Load(imageName);