How dose Unity GUI work?

Unity Engine
1

Hi,I want to draw a lot of large Texture2Ds in Unity GUI Window.
In MS window system,all of the pictures will save in memory,and when finished all the picture painting in a picture,post the finished picuture( actual this is surface) to GUP.
How about unity GUI system?
It seems all of the Texuture2Ds will save in GUP,at first?

2

I write a test,like this:

public class test : MonoBehaviour {
	List<ShowTexutre> showList=new List<ShowTexutre>(); 
	Vector2 scroll_pos=Vector2.zero;
	// Use this for initialization
	void Start () {
		for(int i=0;i<100;i++){
			ShowTexutre st=new ShowTexutre("http://myDomain/test/1.jpg");
			StartCoroutine(st.DownLoad());
			showList.Add(st);
		}
	}
	
	// Update is called once per frame
	void Update () {
	
	}
	void OnGUI(){
		scroll_pos=GUI.BeginScrollView(new Rect(100,100,600,500),scroll_pos,new Rect(0,0,600,16*100));
		for(int r=0;r<16;r++){
			for(int c=0;c<6;c++){
				int index=r*6+c;
				Rect rt=new Rect(c*100,r*100,100,100);
				if(showList[index].PictrueTextrue){
					GUI.DrawTexture(rt,showList[index].PictrueTextrue);
				}else{
					GUI.Box(rt,"");
				}
				
			}
		}
		GUI.EndScrollView();
	}
	class ShowTexutre{
		string _url="";
		private Texture2D _pic=null;
		public ShowTexutre(string url){
			_url=url;
		}
		public IEnumerator DownLoad(){
			WWW downloader=null;
			yield return downloader = new WWW(_url);
			if (downloader.error == null)
            {
                _pic = downloader.texture;
            }
		}
		public Texture2D PictrueTextrue
        {
            get
            {
                return _pic;
            }
        }
	}
}

the size of 1.jpg is 1M.
the error is:system out of memory

3

You should really get rid of the IEnumerator stuff because (IMHO) it is evil.

You could check out eDriven (asynchronous framework for Unity) - with it you can write a more elegant and error proof code .

You could also check out the source of this demo, to see the usage.

4

Hi,I am already see this page–GitHub - dkozar/edriven: Unity3d event-driven framework.
It’s really good idea,wo want to try.