スクリプトでCanvasのTextと繋げる方法

１）TankのHP表示

using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.SceneManagement;

public class TankHealth : MonoBehaviour {

	public GameObject effectPrefab1;
	public GameObject effectPrefab2;
	public int tankHP;

	//public Text tankHPLabel;
	// ★下記に修正
	private GameObject tankHPLabel;
	private Text thl;

	void Start(){
		
		//tankHPLabel.text = "" + tankHP;
		// ★下記に修正
		tankHPLabel = GameObject.Find("TankHPLabel");
		thl = tankHPLabel.GetComponent<Text>();
		thl.text = "" + tankHP;
	}

	void OnTriggerEnter(Collider other){
		if(other.gameObject.CompareTag("EnemyShell")){

			tankHP -= 1;

			//tankHPLabel.text = "" + tankHP;
			// ★下記に修正
			thl.text = "" + tankHP;


			if(tankHP > 0){
				GameObject effect1 = Instantiate(effectPrefab1, transform.position, Quaternion.identity) as GameObject;

				Destroy(effect1, 1.0f);

				Destroy(other.gameObject);
			} else {
				GameObject effect2 = Instantiate(effectPrefab2, transform.position, Quaternion.identity) as GameObject;

				Destroy(effect2, 1.0f);

				Destroy(other.gameObject);

				gameObject.SetActive(false);

				//Destroy(gameObject,3.0f);

				Invoke("SceneChange", 3.0f);
			}
		}
	}

	void SceneChange(){
		SceneManager.LoadScene("Main");

		//Application.LoadLevel("Main");
	}

	// ★★
	public void AddHP(int amount){

		// （復習）
		tankHP += amount;

		//tankHPLabel.text = "" + tankHP;
		// ★下記に修正
		thl.text = "" + tankHP;
	}
}

２）Tankのショットカウント表示

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

public class ShotShell : MonoBehaviour {
	public GameObject shellPrefab;
	public float shotSpeed;
	public AudioClip shotSound;
	public int shotCount;

	//public Text shellLabel;
	// ★下記に修正
	private GameObject shellLabel;
	private Text sl;

	void Start(){
		//shellLabel.text = "" + shotCount;
		// ★下記に修正
		shellLabel = GameObject.Find("ShellLabel");
		sl = shellLabel.GetComponent<Text>();
		sl.text = "" + shotCount;
	}

	void Update () {
		if(Input.GetButtonDown("Fire1")){
			//shotCount -= 1;

			//AudioSource.PlayClipAtPoint(shotSound, transform.position);

			if(shotCount < 1)
				return;

			shotCount -= 1;

			//shellLabel.text = "" + shotCount;
			// ★下記に修正
			sl.text = "" + shotCount;
			Shot();
			AudioSource.PlayClipAtPoint(shotSound, transform.position);
		}
	}

	public void Shot(){
		GameObject shell = Instantiate(shellPrefab, transform.position, Quaternion.identity) as GameObject;
		Rigidbody shellRigidbody = shell.GetComponent<Rigidbody>();
		shellRigidbody.AddForce(transform.forward * shotSpeed);
		Destroy(shell, 2.0f);
	}

	// 砲弾数を増加させるメソッド
	public void AddShell(int amount){

		shotCount += amount;

		//shellLabel.text = "" + shotCount;
		// ★下記に修正
		sl.text = "" + shotCount;
	}
}