Invalid AABB inAABB UnityEngine.Canvas:SendWillRenderCanvases()的解决办法

我遇到这个问题的情况是， 在Start()中直接使用WWW价值本地图片，可能是加载图片相对比较耗时，就出现了这个错误。

解决的办法是使用协程:

// Use this for initialization
	void Start () {

		AddSampleData ();
	
	}

	void AddSampleData(){
	StartCoroutine(WaitLoadImage("/Users/xxxx/xxx/xxx.jpg", go));
	}

	IEnumerator WaitLoadImage(string fileName, GameObject targetGameObject)
	{
		RectTransform rectTransform = targetGameObject.GetComponent<RectTransform> ();
		WWW www=new WWW("file://"+fileName);
		Image img = targetGameObject.GetComponent<Image> ();

		Debug.Log(www.url);

		yield return www;

		Rect spriteRect = new Rect (0, 0, www.texture.width, www.texture.height);
		Sprite imageSprite = Sprite.Create (www.texture, spriteRect, new Vector2 (0.5f, 0.5f));
		img.sprite = imageSprite;

	}