Instantiate a ugui prefab at runtime ?

I tried to instantiate a prefab during runtime using the 'usual' setparent method but it doesn't react the way i expected. Instead of having my popup centered or even showing on screen, it ended located out of the canvas space.

What is the proper way to instantiate a uGui prefab ?

thanks

Code (CSharp):

1.  
2. private GameObject _mainPanel;
3.         private GameObject _gameManager;
4.  
5.  
6.         public void CreateModalWindowFromPrefab(object o) {
7.             EqOkpanel msg = (EqOkpanel) o;
8.  
9.             GameObject go = Resources.Load(msg.Prefab,typeof(GameObject)) as GameObject;
10.             go =GameObject.Instantiate(go);
11.             go.transform.SetParent(_mainPanel.transform,true);
12.             go.GetComponent<ModalHelper>().SetData(msg.Title,msg.Message);
13.         }

 

Here is a snippet where I'm loading a prefab toggle item for quality settings.

Code (CSharp):

1. public RectTransform containerQualitys;
2. public GameObject prefabQualityToggle;
3.  
4. void AddItem ()
5. {
6.     GameObject addedChild = (GameObject)Instantiate(prefabQualityToggle);
7.     addedChild.transform.SetParent(containerQualitys);
8. }

 

What I'm not seeing is you giving the prefab any position.

Code (CSharp):

1.  
2.     public Image _Worker;
3.     /// <summary>
4.     /// Creates a worker at the position and for the team given.
5.     /// </summary>
6.     /// <param name="position">Position.</param>
7.     /// <param name="team">Team.</param>
8.     public void CreateWorker(Vector3 position, Teams team)
9.     {      
10.         // Create the gameobject
11.         Image aImage = (Image) Instantiate(_Worker, position, Quaternion.identity);
12.         aImage.transform.SetParent(_WorkerCanvas.transform, true);
13.         aImage.GetComponent<WorkerAI>().Initialize(team);
14.         aImage.rectTransform.sizeDelta = new Vector2(_BuildingSideLength / 3F, _BuildingSideLength / 3F);
15.     }

 

That would depend on whether it actually needs a specific position. If the object in question happens to be inside a layout group, you don't need to set a position at all.

 

Ah, so what I've found is that making uGUI components prefabs breaks some of the relationships you'd expect them to keep. Maybe you need to re-add the instantiated uGui component to the layout group via code. Sorry, haven't done prefabs and layout coimponents, so it's just a thought.

 

Prefabs can't have references to other objects in the scene, if that's what you mean. Not specific to uGUI, though, that's the same for all types of prefabs.

After instantiating your uGUI prefab, you would need to parent it to your desired parent object. If you don't do that, it will become a root object, which is most likely not what you want.

 

If you do figure it out OP please post what it was, I was attempting to instantiate some buttons not long ago but gave up and ended up using another method to get the function completed, but I was running into similar problems when trying to instantiate uGui components from prefabs.

 

you need call obj.GetComponent<RectTransform>.SetParent(parent.transform,false);

 

no luck so far. The prefab is parented correctly now using GetComponent<RectTransform>.SetParent(parent.transform,false);

but it appears completely destroyed: the background image is missing, the contents are outside its panel and the main anchor which is supposed to be centered is not taken in account...

 

give me your unity runtime Hierarchy view

 

Here is the runtime hierarchy...
When i parent the prefab manually all is correct...

 

What's wrong about that hierarchy, not being familiar with your project, I don't know? Can you show a picture of a correct one, so we can see what's missing?

 

The problem is everything seems right but the result is not ! The popup appears in the bottom corner and its panel is 'crossed' like shown in a previous post.

 

Just a thought... have you tried this with "world space" set to true? In my UI project I had to switch to that so scaling would work on android machines.