unity3d 实现PC和移动端（安卓、ios）的前置和后置摄像机调用，并将内容显示在UI上

在场景中添加RawImage组件。

在其父节点上挂载CallCamera脚本。CallCamera脚本如下：

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

public class CallCamera : MonoBehaviour
{

    [HideInInspector]
    public WebCamTexture webTex;
    [HideInInspector]
    public string deviceName;
    //现实摄像头画面
    public RawImage rawImage;


    void Awake()
    {
        StartCoroutine(IECallCamera());
    }

    IEnumerator IECallCamera()
    {
        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);
        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            WebCamDevice[] devices = WebCamTexture.devices;


            如果有前置摄像头，调用前置摄像头 
            //for (int i = 0; i < devices.Length; i++)
            //{
            //    if (devices[i].isFrontFacing)
            //    {
            //        deviceName = devices[i].name;
            //        break;
            //    }

            //}
            //如果有后置摄像头，调用后置摄像头  
            for (int i = 0; i < devices.Length; i++)
            {
                if (!devices[i].isFrontFacing)
                {
                    deviceName = devices[i].name;
                    break;
                }
            }

            //设置摄像机摄像的区域    
            webTex = new WebCamTexture(deviceName, Screen.width, Screen.height, 20);
          
            webTex.Play();//开始摄像    


#if UNITY_ANDROID
            float physicscreen = Mathf.Sqrt(Screen.width * Screen.width + Screen.height * Screen.height) / Screen.dpi;
            if (physicscreen >= 7f)
            {
                Debug.Log("安卓平板");              
            }
            else
            {
                Debug.Log("安卓手机");
            }
#elif UNITY_IPHONE
			Debug.Log(UnityEngine.iOS.Device.generation);
			string iP_genneration = UnityEngine.iOS.Device.generation.ToString();  
			//The second Mothod: 
			//string iP_genneration=SystemInfo.deviceModel.ToString();

			Debug.Log(iP_genneration);
			if (iP_genneration.Substring(0, 3) == "iPa")
			{
				Debug.Log("苹果平板");
				
				rawImage.GetComponent<RectTransform>().sizeDelta = new Vector2(Screen.height , Screen.width);
			}
			else
			{
				Debug.Log("苹果手机");
				
				rawImage.GetComponent<RectTransform>().sizeDelta = new Vector2(Screen.height, Screen.width );			
			}
#endif

            rawImage.texture = webTex;


        }
    }

    private void OnEnable()
    {
        Debug.Log("OnEnable");
        if (webTex != null)
        {
            webTex.Play();//开始摄像    
        }


    }

    public void OnDisable()
    {
        Debug.Log("OnDisable");
        webTex.Stop();
    }



}

绑定RawImage在脚本上。

运行游戏，摄像机内容即可显示在RawImage上。