hyzp_ybqx/lib/components/LogUtil.dart

import 'package:flutter/cupertino.dart';

void segmentPrint(String msg, {int len = 600}) {
  var outStr = StringBuffer();
  for (var index = 0; index < msg.length; index++) {
    outStr.write(msg[index]);
    if (index % len == 0 && index != 0) {
      print(outStr);
      outStr.clear();
      var lastIndex = index + 1;
      if (msg.length - lastIndex < len) {
        var remainderStr = msg.substring(lastIndex, msg.length);
        print(remainderStr);
        break;
      }
    }
  }
}

//	///是否在生产环境
// 	///const bool isDebug = !const bool.fromEnvironment("dart.vm.product");
//
// 	//参数可选 isDebug默认true limitLength默认800
// 	LogUtil.init(title: "来自LogUtil", isDebug: isDebug,limitLength:800);
//
// 	var log = "我是日志";
// 	//仅在Debug时打印
// 	LogUtil.d(log);
// 	LogUtil.d("我是日志");
//
// 	//在所有环境中打印
// 	LogUtil.v(log);
// 	LogUtil.v("我是日志");
// ————————————————
// 版权声明：本文为CSDN博主「懒散的阿乐」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
// 原文链接：https://blog.csdn.net/zylvip/article/details/102608256

class LogUtil {
  static var _separator = "=";
  static var _split =
      "$_separator$_separator$_separator$_separator$_separator$_separator$_separator$_separator$_separator";
  static var _title = "Yl-Log";
  static var _isDebug = true;
  static int _limitLength = 1200;
  static String _startLine = "$_split$_title$_split";
  static String _endLine = "$_split$_separator$_separator$_separator$_split";

  static void init({String title, @required bool isDebug, int limitLength}) {
    _title = title;
    _isDebug = isDebug;
    _limitLength = limitLength ??= _limitLength;
    _startLine = "$_split$_title$_split";
    var endLineStr = StringBuffer();
    var cnCharReg = RegExp("[\u4e00-\u9fa5]");
    for (int i = 0; i < _startLine.length; i++) {
      if (cnCharReg.stringMatch(_startLine[i]) != null) {
        endLineStr.write(_separator);
      }
      endLineStr.write(_separator);
    }
    _endLine = endLineStr.toString();
  }

  //仅Debug模式可见
  static void d(dynamic obj) {
    if (_isDebug) {
      _log(obj.toString());
    }
  }

  static void v(dynamic obj) {
    _log(obj.toString());
  }

  static void _log(String msg) {
    print("$_startLine");
    _logEmpyLine();
    if (msg.length < _limitLength) {
      print(msg);
    } else {
      segmentationLog(msg);
    }
    _logEmpyLine();
    print("$_endLine");
  }

  static void segmentationLog(String msg) {
    var outStr = StringBuffer();
    for (var index = 0; index < msg.length; index++) {
      outStr.write(msg[index]);
      if (index % _limitLength == 0 && index != 0) {
        print(outStr);
        outStr.clear();
        var lastIndex = index + 1;
        if (msg.length - lastIndex < _limitLength) {
          var remainderStr = msg.substring(lastIndex, msg.length);
          print(remainderStr);
          break;
        }
      }
    }
  }

  static void _logEmpyLine() {
    print("");
  }
}

//common_utils 工具类已经将pring 封装为工具类
//
// common_utils: ^1.1.1
// 使用common_utils工具类中的LogUtil
//
// //初始化设置 LogUtil
// LogUtil.init(true);
// //输出日志
// LogUtil.v("test");
// 当然 LogUtil 的 init 方法可根据是否是生产环境来配置 true 与 false ，如果是 false ,则不输出日志，这样的一个优化也是应用在发版本后可以节省向控制台输出日志信息的消耗。
//
// 封装源码如下

class LogUtil2 {
  static const String _TAG_DEF = "###common_utils###";

  static bool debuggable = false; //是否是debug模式,true: log v 不输出.
  static String TAG = _TAG_DEF;

  static void init({bool isDebug = false, String tag = _TAG_DEF}) {
    debuggable = isDebug;
    TAG = tag;
  }

  static void e(Object object, {String tag}) {
    _printLog(tag, '  e  ', object);
  }

  static void v(Object object, {String tag}) {
    if (debuggable) {
      _printLog(tag, '  v  ', object);
    }
  }

  static void _printLog(String tag, String stag, Object object) {
    StringBuffer sb = new StringBuffer();
    sb.write((tag == null || tag.isEmpty) ? TAG : tag);
    sb.write(stag);
    sb.write(object);
    print(sb.toString());
  }
}