依赖 google_mlkit_text_recognition 实现的 OCR 文本识别相机，支持局部识别。
添加依赖：
dependencies:
flutter_ocr_text_recognization: x.x.ximport 'package:flutter_ocr_text_recognization/flutter_ocr_text_recognization.dart';示例：
TextOrcScan(
paintboxCustom: Paint()
..style = PaintingStyle.stroke
..strokeWidth = 4.0
..color = const Color.fromARGB(153, 102, 160, 241),
boxRadius: 12,
painBoxLeftOff: 5,
painBoxBottomOff: 2.5,
painBoxRightOff: 5,
painBoxTopOff: 2.5,
widgetHeight: MediaQuery.of(context).size.height / 3,
getScannedText: (value) {
setText(value);
},
)参考自 https://pub-web.flutter-io.cn/packages/flutter_scalable_ocr ， 因项目需要，修复部分原库发现的问题，新建本库。