Flutter 拓展之String

//  @Description: String拓展
//  @Author: 陈胜辉
//  @Date: 2019-12-18 09:52:25
//  @Version: 版本号, YYYY-MM-DD
//  @LastEditors: 陈胜辉
//  @LastEditTime: 2019-12-18 13:06:42
//  @Deprecated: 否
//  备注
import 'dart:convert';
import 'package:crypto/crypto.dart';
import 'package:flutter/material.dart';

final String regexEmail = '[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}';

extension SHExtension on String {
  ///  16进制string 转 color
  Color toColor() {
    String hex = this.replaceAll('#', '');
    int count = 0;
    switch (hex.length) {
      case 3: // #RGB
      case 4: // #ARGB
        count = 1;
        break;
      case 6: // #RRGGBB
      case 8: // #AARRGGBB
        count = 2;
        break;
      default: // 默认颜色
        return Colors.transparent;
        break;
    }

    List temp = [];
    for (int i = 0; i < hex.length; i += count) {
      String str = hex.substring(i, i + count);
      temp.add(int.parse(str, radix: 16));
    }

    if (temp.length == 3) {
      temp.insert(0, 255);
    }

    return Color.fromRGBO(temp[1], temp[2], temp[3], temp[0] / 255.0);
  }

  /// MD5加密
  String getMD5() {
    var content = Utf8Encoder().convert(this);
    var digest = md5.convert(content);
    return digest.toString();
  }

  /// 判断是否是邮箱
  bool isEmail() {
    return RegExp(regexEmail).hasMatch(this);
  }

  /// string 转 int
  int toInt() {
    return int.parse(this);
  }

  /// string 转 double
  double toDouble() {
    return double.parse(this);
  }

  /// string 转bool
  // (字符串 不等于'true' 不大于0 等于空时 返回false 否则返回true)
  bool toBool() {
    if (this.toLowerCase() == "true" ||
        this.toInt() > 0 ||
        this.toDouble() > 0 ||
        this.trim() != '' ||
        this != '') {
      return true;
    }
    return false;
  }

  /// 编码
  String toCoding() {
    String str = this.toString();
    // 对字符串进行编码
    return jsonEncode(Utf8Encoder().convert(str));
  }

  /// 解码
  String toDeCoding() {
    var list = List();

    // 字符串解码
    jsonDecode(this).forEach(list.add);
    String value = Utf8Decoder().convert(list);
    return value;
  }
}