Question

我真的不确定这是错的......

我正在关注YouTube视频，因为这段代码对我来说太先进了。我不知道它是否与unity 5或者其他什么问题，但它只是一直给我这个错误：错误CS0120：需要一个对象引用来访问非静态成员`UnityEngine.Camera.ScreenPointToRay（UnityEngine.Vector3）'

我知道从YouTube上复制而不知道它意味着什么可能是一个坏主意，但我只想尝试获取触摸屏内容的脚本。

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

public class TouchInput : MonoBehaviour {

public LayerMask touchInputMask;

private List<GameObject> touchList = new List<GameObject>();
private GameObject[] touchesOld;

private RaycastHit hit;

void Update () {

    #if UNITY_EDITOR
    if (Input.GetMouseButton(0) || Input.GetMouseButtonDown(0) || Input.GetMouseButtonUp(0)) {

        touchesOld = new GameObject[touchList.Count];
        touchList.CopyTo(touchesOld);
        touchList.Clear();

        Ray ray = Camera.ScreenPointToRay(Input.mousePosition);

        if(Physics.Raycast(ray,out hit,touchInputMask)){

            GameObject recipient = hit.transform.gameObject;
            touchList.Add(recipient);

            if(Input.GetMouseButtonDown(0)){
                recipient.SendMessage("OnTouchDown",hit.point,SendMessageOptions.DontRequireReceiver);
            }
            if(Input.GetMouseButtonUp(0)){
                recipient.SendMessage("OnTouchUp",hit.point,SendMessageOptions.DontRequireReceiver);
            }
            if(Input.GetMouseButton(0)){
                recipient.SendMessage("OnTouchStay",hit.point,SendMessageOptions.DontRequireReceiver);
            }
        }

        foreach (GameObject g in touchesOld){
            if(!touchList.Contains(g)){
                g.SendMessage("OnTouchExit",hit.point,SendMessageOptions.DontRequireReceiver);
            }
        }
    }
    #endif

    if (Input.touchCount > 0) {

        touchesOld = new GameObject[touchList.Count];
        touchList.CopyTo(touchesOld);
        touchList.Clear();

        foreach (Touch touch in Input.touches) {

            Ray ray = Camera.ScreenPointToRay(touch.position);

            if(Physics.Raycast(ray,out hit,touchInputMask)){

                GameObject recipient = hit.transform.gameObject;
                touchList.Add(recipient);

                if(touch.phase == TouchPhase.Began){
                    recipient.SendMessage("OnTouchDown",hit.point,SendMessageOptions.DontRequireReceiver);
                }
                if(touch.phase == TouchPhase.Ended){
                    recipient.SendMessage("OnTouchUp",hit.point,SendMessageOptions.DontRequireReceiver);
                }
                if(touch.phase == TouchPhase.Stationary || touch.phase == TouchPhase.Moved){
                    recipient.SendMessage("OnTouchStay",hit.point,SendMessageOptions.DontRequireReceiver);
                }
                if(touch.phase == TouchPhase.Canceled){
                    recipient.SendMessage("OnTouchExit",hit.point,SendMessageOptions.DontRequireReceiver);
                }
            }

        }
        foreach (GameObject g in touchesOld){
            if(!touchList.Contains(g)){
                g.SendMessage("OnTouchExit",hit.point,SendMessageOptions.DontRequireReceiver);
            }
        }
    }

}
}

Answer 1

我不是Unity专家，但文档说ScreenPointToRay是一个实例方法，而不是静态方法。这意味着您必须在使用之前创建Camera实例。所以，也许：

camera = GetComponent<Camera>();
Ray ray = camera.ScreenPointToRay(touch.position);

请注意，您的代码段中有两处您需要进行此更改。

错误CS0120：访问非静态成员`UnityEngine.Camera.ScreenPointToRay（UnityEngine.Vector3）'需要对象引用

1 个答案: