Unity 3D 捕获错误日志 打印在屏幕上

错误日志的现场往往是非常珍贵的，我们需要尽可能的将错误日志保存下来。如果是移动平台，保存和提取日志其实不方便。所以可以监听错误以及异常，并及时打印在屏幕上。

using System.Collections.Generic;
using UnityEngine;

public class ErrorLogOnGUIMyTools : MonoBehaviour
{
    private List m_logEntries = new List();

    private bool m_IsVisible = false;

    private Rect m_WindowRect = new Rect(0, 0, Screen.width, Screen.height);

    private Vector2 m_scrollPositionText = Vector2.zero;

    private void Start()
    {
        Application.logMessageReceived += (string condition, string stackTrace, LogType type) =>
        {
            if (type == LogType.Exception || type == LogType.Error)
            {
                if (!m_IsVisible)
                {
                    m_IsVisible = true;
                }
                m_logEntries.Add(string.Format("{0}\n{1}", condition, stackTrace));
            }
        };

        for (int i = 0; i < 30; i++)
        {
            Debug.LogError("test error!");
        }
    }

    void ConsoleWindow(int windowID)
    {
        GUILayout.BeginHorizontal();
        if (GUILayout.Button("Clear", GUILayout.MaxWidth(200), GUILayout.MaxHeight(100)))
        {
            m_logEntries.Clear();
        }
        if (GUILayout.Button("Close", GUILayout.MaxWidth(200), GUILayout.MaxHeight(100)))
        {
            m_IsVisible = false;
        }
        GUILayout.EndHorizontal();

        m_scrollPositionText = GUILayout.BeginScrollView(m_scrollPositionText);

        foreach (var entry in m_logEntries)
        {
            Color color = GUI.contentColor;
            GUI.contentColor = Color.red;
            GUILayout.TextArea(entry);
            GUI.contentColor = color;
        }
        GUILayout.EndScrollView();
    }

    private void OnGUI()
    {
        if (m_IsVisible)
        {
            m_WindowRect = GUILayout.Window(0, m_WindowRect, ConsoleWindow, "Console");
        }
    }
}

监听 Application.logMessageReceived 事件即可捕获错误日志，利用OnGUI() 打印在屏幕上。