Cannot drag object IOS

Questions & Answers
1

HI,

I have a plane that I am trying to drag using touch. It is basically a scoreboard with a little tab off screen that can be swiped on and off the screen whenever needed.

The game is top down - so everything is lying horizontally with an orthographic camera.

Here is my script:

#pragma strict

var speed : float = 30.0;



function Update () {

	var clickDetected : boolean;
    var touchPosition : Vector3;
    
    // Detect click and calculate touch position

        clickDetected = (Input.touchCount > 0 && Input.GetTouch(0).phase == TouchPhase.Began);
        touchPosition = Input.GetTouch(0).position;
    
    // Detect mouse left clicks
    if (clickDetected) {
    
        // Check if the GameObject is clicked by casting a
        // Ray from the main camera to the touched position.
        var ray : Ray = Camera.main.ScreenPointToRay 
                            (touchPosition);
        var hit : RaycastHit;

        // Cast a ray of distance 100, and check if this
        // collider is hit.
        if (collider.Raycast (ray, hit, 3000.0)) {
            // Log a debug message
            Debug.Log("Moving the target");
            // Move the target forward
            transform.Translate(Vector3.up * speed);       
        } else {
            // Clear the debug message
            Debug.Log("");
        }
    }
}

I can touch the object I am trying to drag when the ray hits it. But it barely moves a pixel or two and then won’t budge. I can keep touching it this way and slowly move it, laboriously up the screen - but I’m trying to achieve a nice smooth drag up the screen, with the plane attaching to my finger until I break from the screen.

What am I doing wrong?

Thankyou.

2

Input.GetTouch(0).phase == TouchPhase.Began is only true when the touch started, not when the finger is dragging. For that you need to check Input.GetTouch(0).phase == TouchPhase.Moved.

Try changing the clickDetected check to this:

clickDetected = (Input.touchCount > 0 && (Input.GetTouch(0).phase == TouchPhase.Began || Input.GetTouch(0).phase == TouchPhase.Moved));