yichael_smartbow/Assets/BowArrow/Scripts/Game/TargetDistanceLabel.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class TargetDistanceLabel : MonoBehaviour
{
    public RectTransform canvasRTF;
    public Camera mainCamera;
    public Transform followTarget;
    TargetBody targetBody;
    Vector3 centerPoint = new Vector3(0.5f, 0.5f, 0);
    void Start()
    {
        targetBody = GameObject.Find("GameArea/010").GetComponentInChildren<TargetBody>();
    }
    void LateUpdate()
    {
        Vector3 v3 = mainCamera.WorldToViewportPoint(followTarget.position) - centerPoint;
        v3.x *= canvasRTF.rect.width;
        v3.y *= canvasRTF.rect.height;
        v3.z = 0;
        this.transform.localPosition = v3;
        this.GetComponent<Text>().text = ((int)Mathf.Round(targetBody.GetDistance())) + "M";
    }
}