Flutter 枚举enum和字符串String 互转

///枚举类型转string
String enumToString(o) => o.toString().split('.').last;

///string转枚举类型
T enumFromString<T>(Iterable<T> values, String value) {
  return values.firstWhere((type) => type.toString().split('.').last == value,
      orElse: () => null);
}