Unity API常用方法和类（三）

一.射线检测
【1】Raycast
（1）基本方法
检测物体player前方是否有物体

void Update ()
 {
    Ray ray = new Ray(transform.position+transform.forward, transform.forward);
    bool isCollider = Physics.Raycast(ray);
    Debug.Log(isCollider);
    }

（2）重载方法

 <1> 
    void Update ()
    { 
    Ray ray = new Ray(transform.position+transform.forward, transform.forward);
    bool isCollider = Physics.Raycast(ray, 1);  //player在1米范围内才能检测到敌人
    Debug.Log(isCollider); 
    }
 <2>
    Ray ray = new Ray(transform.position+transform.forward, transform.forward);
    RaycastHit hit;
    bool isCollider = Physics.Raycast(ray, out hit);
    Debug.Log(isCollider);
    Debug.Log(hit.collider);
    Debug.Log(hit.point);

<3>
   Ray ray = new Ray(transform.position+transform.forward, transform.forward);
   RaycastHit hit;
    bool isCollider = Physics.Raycast(ray, Mathf.Infinity, LayerMask.GetMask("Enemy1", "Enemy2", "UI"));//射线无限长，指定layer层发生碰撞。
    Debug.Log(isCollider);

（3）RaycastAll

在当前情况下，Raycast默认输出碰撞到的第一个物体的信息；RaycastAll则输出碰撞到的两个的信息。
二. UGUI事件监听
【1】拖拽

在各自的inspector面板中找到类似这样的面板。

拖拽物体到红圈位置

【2】代码添加

using System.Collections;
using System.Collections.Generic;
using System;
using UnityEngine;
using UnityEngine.UI;	//创造UI环境
public class UIEventManager : MonoBehaviour {
	public GameObject btnGameObject;
 	public GameObject sliderGameObject;
	public GameObject dropDownGameObject;
	public GameObject toggleGameObject;
void Start () {
	btnGameObject.GetComponent<Button>().onClick.AddListener(this.ButtonOnClick);
 	sliderGameObject.GetComponent<Slider>().onValueChanged.AddListener(this.OnSliderChanged);
 	dropDownGameObject.GetComponent<Dropdown>().onValueChanged.AddListener(this.OnDropDownChanged);
  	toggleGameObject.GetComponent<Toggle>().onValueChanged.AddListener(this.OnToggleChanged);
}
void ButtonOnClick()
{
    Debug.Log("ButtonOnClick");
}
void OnSliderChanged(float value)
{
    Debug.Log("SliderChanged:" + value);
}
void OnDropDownChanged(Int32 value)
{
    Debug.Log("DropDownChanged:" + value);
}
void OnToggleChanged(bool value)
{
    Debug.Log("ToggleChanged:" + value);
}
void Update () {
}
}

【3】通过实现接口

(1)

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
public class UIEventManager2 :	MonoBehaviour, IPointerDownHandler,IPointerClickHandler,IPointerUpHandler,IPointerEnterHandler,IPointerExitHandler
{
 public void OnPonintClick(PointerEventData eventData)
 {
    Debug.Log("OnPonintClick");
 }
public void OnPonintDown(PointerEventData eventData)
{
    Debug.Log("OnPonintDown");
}
public void OnPonintEnter(PointerEventData eventData)
{
    Debug.Log("OnPonintEnter");
}
public void OnPointExit(PointerEventData eventData)
{
    Debug.Log("OnPointExit");
}
public void OnPointUp(PointerEventData eventData)
{
    Debug.Log("OnPointUp");
}
}

一定要勾选Raycast Target

(2)跟拖拽相关的事件接口的实现

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System;
public class UIEventManager2 : MonoBehaviour,IBeginDragHandler,IDragHandler,IEndDragHandler,IDropHandler
{
 public void OnBeginDrag(PointerEventData eventData)
{
    Debug.Log("OnBeginDrag");
}
public void OnDrag(PointerEventData eventData)
{
    Debug.Log("OnDrag");
}
public void OnDrop(PointerEventData eventData)
{
    Debug.Log("OnDrop");
}
public void OnEndDrag(PointerEventData eventData)
{
    Debug.Log("OnEndDrag");
}
public void OnPointerClick(PointerEventData eventData)
{
    Debug.Log("OnPointerClick");
}
public void OnPointerDown(PointerEventData eventData)
{
    Debug.Log("OnPointerDown");
}
public void OnPointerEnter(PointerEventData eventData)
{
    Debug.Log("OnPointerEnter");
}
public void OnPointerExit(PointerEventData eventData)
{
    Debug.Log("OnPointerExit");
}
 public void OnPointerUp(PointerEventData eventData)
 {
    Debug.Log("OnPointerUp");
}
}

三. WWW
通过WWW下载图片

public string url = "https://ss0.bdstatic.com/70cFuHSh_Q1YnxGkpoWK1HF6hhy/it/u=2622066562,1466948874&fm=27&gp=0.jpg";//图片地址
IEnumerator Start()
{
    WWW www = new WWW(url);
    yield return www;
    Renderer renderer = GetComponent<Renderer>();
    renderer.material.mainTexture = www.texture;
}

四. Touches触摸事件

if (Input.touches.Length > 0)
    {
        Touch touch1 = Input.touches[0];
        TouchPhase phase  = touch1.phase;
    }

来源：CSDN

作者：???????wfjj

链接：https://blog.csdn.net/ZXY_ruchu/article/details/104578044

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