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

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

public class CrossHairOutBoundChecker : MonoBehaviour
{
    [SerializeField] GameObject outTip;
    string[] tips = {
        "瞄准方向已超出视野范围，请将弓往右移动！",
        "瞄准方向已超出视野范围，请将弓往左移动！",
        "瞄准方向已超出视野范围，请将弓往下移动！",
        "瞄准方向已超出视野范围，请将弓往上移动！",
    };
    int tipIndex = -1;

    void Update()
    {
        Rect pr = CrossHair.ins.parentRTF.rect;
        Vector3 lp = CrossHair.ins.transform.localPosition;
        int newTipIndex = -1;
        if (lp.x < -pr.width / 2) {
            newTipIndex = 0;
        } else if (lp.x > pr.width / 2) {
            newTipIndex = 1;
        } else if (lp.y > pr.height / 2) {
            newTipIndex = 2;
        } else if (lp.y < -pr.height / 2) {
            newTipIndex = 3;
        } 
        if (newTipIndex != tipIndex) {
            tipIndex = newTipIndex;
            if (tipIndex >= 0) {
                outTip.GetComponent<Text>().text = tips[tipIndex];
            }
        }
        if (newTipIndex >= 0) {
            if (!outTip.activeSelf) outTip.SetActive(true);
        } else {
            if (outTip.activeSelf) outTip.SetActive(false);
        }
    }
}