Convert a Transform to a RectTransform

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In my Unity project, I am creating objects dynamically through scripts.

var btnExit = new GameObject("Player " + ID + "'s Exit Button");
btnExit.transform.SetParent(UI.transform);

I need to set the anchors and pivot of the object. I should be able to do that using its RectTransform component, as I do it when I create objects in the scene editor.

myRectTransform.anchorMin = new Vector2(1, 0);
myRectTransform.anchorMax = new Vector2(0, 1);
myRectTransform.pivot = new Vector2(0.5f, 0.5f);

But the object's transform component is not a RectTransform, just the normal Transform. So I can't cast it to use those properties I need.

RectTransform myRectTransform = (RectTransform)btnExit.transform;

So how can I properly use the power of the RectTransform class on an object that I initialise through scripts instead of in the scene editor?

You can't cast Transform to RectTransform. That's what GetComponent is use for. Use GetComponent on the btnExit variable and you will be able to get the RectTransform from the Button.

RectTransform myRectTransform =  btnExit.GetComponent<RectTransform>();

Note:

You should only do this after calling SetParent, since SetParent will make Unity automatically attach RectTransform to the btnExit variable if the Parent Object is a UI Object such as Canvas. You can also use AddComponent to attach RectTransform to that GameObject.

If you don't do any of these, you will get null since RectTransform is not attached to the Button .

Transform to RectTransform Conversion, I want to either: 1) Remove the RectTransform component, or, 2) Change it to transform, if Unity Engine does not permit removing the transform  Converting a RectTransform on a canvas into a Transform (world position) Question sooo first of all, i'm a game artist learning how to code alone here, so be kind pls. i'm quite used to Unity tho.

RectTransform rectTransform = transform.GetComponent<RectTransform>();

RectTransform rectTransform = (transform as RectTransform);

RectTransform rectTransform = (RectTransform)transform;

As long as your object has a RectTransform, these are all valid ways to get the RectTransform from the built-in transform reference.

How to change a RectTransform component into a Transform , The number of transforms in the transform's hierarchy data structure. localEulerAngles, The rotation as Euler angles in degrees relative to the parent transform's  Convert a Transform to a RectTransform. Ask Question Asked 2 years, 10 months ago. Active 1 year, 7 months ago. You can't cast Transform to RectTransform.

You can directly add a RectTransform component to the gameobject, and the Transform component will change to Rect Transform.

For example:

var btnExit = new GameObject("Player " + ID + "'s Exit Button");
btnExit.AddComponent<RectTransform>();

Then the cast will work:

RectTransform myRectTransform = (RectTransform)btnExit.transform;

P.S.

Without adding the component, the above cast will throw error

InvalidCastException: Cannot cast from source type to destination type.

But with the component added, the cast works fine. Above code is tested in Unity 2018.2.5f1 (64bit).

Scripting API: RectTransform, Watch on the official Unity Learn site - The Rect Transform is the positioning component for any Duration: 14:11 Posted: Aug 20, 2014 I want to change a RectTransform via Script. If I use the tool in the editor (shortcut: T) I can change the area of the RectTransform. But, in the Inspector of the component there are two variables changing if I use this tool: the position and the width or height.

Rect Transform - Unity Official Tutorials, First of all, ensure you set the parent before setting local position, then, you have two options according to the type of Rect Transform : non-stretching and  pauseCursor.rectTransform.position = new Vector3 (-45f, -80.6f, 0); It fails and looking in the inspector again the x,y values are like 300, 800 or something. I am guessing I need a conversion I just am not sure where or how.

How do I set the exact local position of a RectTransform?, ScreenToWorldPoint(rectTransform.transform.position);. Basically, all you have to do is use the ScreenToWorldPoint method and pass it the  RectTransforms are used for GUI but can also be used for other things. It's used to store and manipulate the position, size, and anchoring of a rectangle and supports various forms of scaling based on a parent RectTransform. Note: The Inspector changes which properties are exposed based on which anchor preset is in use. For more information see

Convert Unity UI Screen Space position to World position – Robot , CalculateRelativeRectTransformBounds(transform.parent);. Vector2 parentSize = new Vector2(parentBounds.size.x, parentBounds.size.y);. // convert anchor  Ok I think I should have been more clear. I want to extend the RectTransform in one direction, so I want to change the position of the border of the rect transform. If I do this by using the rectTransform tool in the Editor (shortcut T) I change two variables in the inspector: position and width. Now: Is there a way to do this conveniently?

Comments
  • 1. this should be the accepted answer. 2. but do you have some info on performance of GetComponent vs casting transform? From what I know, GetComponent is usually relatively slow, and I'd assume transform uses a shortcut (being the component each gameobject has to have), so I'd think casting transform could be faster? I should test it out, but I don't have the time now :/
  • It's my understanding that "transform" is a cached reference. I haven't dug into the performance costs of each option listed, but I think it's safe to assume that the cast will be faster. It definitely won't be slower in any case. I always cast instead of using GetComponent for that reason, but I have never confirmed that assumption.