unity 利用WebCamTexture 开启相机，解决移动端画面反转问题和首次点击同意权限后相机打不开问题。

1：解决相机反转问题，和安装后点击同意相机权限后，相机没有打开。

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

//挂载到RawImage上即可
[RequireComponent(typeof(AspectRatioFitter))]
[RequireComponent(typeof(RawImage))]
public class Webcam_Test : MonoBehaviour
{

    private WebCamTexture cameraTexture;
    //加上AspectRatioFitter组件调整画面尺寸
    RawImage background;

    AspectRatioFitter fit;

    bool isFirst = true;
    IEnumerator Start()
    {
        InitData();
        yield return StartCoroutine(InitCameraCor());
    }

    // Update is called once per frame  
    void Update()
    {
        //调整rawimage
        AdjustmentRawimage();
        //处理用户首次同意权限后相机没有打开的问题
        if (cameraTexture == null)
        {
            var isOk = Application.HasUserAuthorization(UserAuthorization.WebCam);
            
            if (Application.platform == RuntimePlatform.Android)
            {
               //等待用户同意
                if (isOk)
                {
                    if (isFirst)
                    {
                        isFirst = false;
                        WebCamDevice[] devices = WebCamTexture.devices;
                        var DeviceName = devices[0].name;
                        //判断平台
                        if (Application.platform == RuntimePlatform.Android || Application.platform == RuntimePlatform.IPhonePlayer)
                        {
                            for (int i = 0; i < devices.Length; i++)
                            {
                                //开启后置摄像头
                                if (!devices[i].isFrontFacing)
                                {
                                    DeviceName = devices[i].name;
                                    break;
                                }
                            }
                        }

                        cameraTexture = new WebCamTexture(DeviceName, Screen.width, Screen.height, 15);
                        cameraTexture.Play(); // Start the camera
                        background.texture = cameraTexture; // Set the texture
                    }

                }
            }
        }


    }

    void InitData()
    {
        background = this.transform.GetComponent<RawImage>();
        fit = this.transform.GetComponent<AspectRatioFitter>();
        fit.aspectMode = AspectMode.EnvelopeParent;

    }
    /// <summary>  
    /// 初始化摄像头
    /// </summary>  
    public IEnumerator InitCameraCor()
    {

        yield return Application.RequestUserAuthorization(UserAuthorization.WebCam);

        if (Application.HasUserAuthorization(UserAuthorization.WebCam))
        {
            WebCamDevice[] devices = WebCamTexture.devices;
            var DeviceName = devices[0].name;
            //判断平台
            if (Application.platform == RuntimePlatform.Android || Application.platform == RuntimePlatform.IPhonePlayer)
            {
                for (int i = 0; i < devices.Length; i++)
                {
                    //开启后置摄像头
                    if (!devices[i].isFrontFacing)
                    {
                        DeviceName = devices[i].name;
                        break;
                    }
                }
            }
            cameraTexture = new WebCamTexture(DeviceName, Screen.width, Screen.height, 15);
            cameraTexture.Play(); // Start the camera  
            background.texture = cameraTexture; // Set the texture  

        }

    }

    void AdjustmentRawimage()
    {

        if (cameraTexture == null) return;

        float ratio = (float)cameraTexture.width / (float)cameraTexture.height;
        fit.aspectRatio = ratio; // Set the aspect ratio  


        float scaleY = cameraTexture.videoVerticallyMirrored ? -1f : 1f; // Find if the camera is mirrored or not  
        background.rectTransform.localScale = new Vector3(1f, scaleY, 1f); // Swap the mirrored camera  


        int orient = -cameraTexture.videoRotationAngle;
        background.rectTransform.localEulerAngles = new Vector3(0, 0, orient);

    }

    //这下面的是我跳转到AR场景当中的，需要把上个场景中的webcamTexture关闭。

    //没有这一需求的小伙伴门可以忽略

    //private void OnDestroy()
    //{
    //    cameraTexture.Stop();
    //    cameraTexture = null;
    //}
}

 

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