Flutter 图片裁剪（相机，相册）

今天用到了一个特别好用的图片裁剪库，在这里分享一下Copper

先看一下效果图

编辑效果

这个裁剪库还是蛮强的，有左右旋转，比例选择，也可以手动滑动四个角来选择自己想要的裁剪区域

下面给出代码

import 'package:flutter/material.dart';
import 'dart:async';
import 'dart:io';
import 'package:image_cropper/image_cropper.dart';
import 'package:image_picker/image_picker.dart';

class Cropper extends StatefulWidget {
  final String title;

  Cropper({this.title});

  @override
  _CropperState createState() => _CropperState();
}

class _CropperState extends State<Cropper> {
  File imageFile;

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(widget.title),
      ),
      body: Center(
        child: imageFile != null ? Image.file(imageFile) : Container(),
      ),
      floatingActionButton: FloatingActionButton(
        backgroundColor: Colors.deepOrange,
        onPressed: () 
          pickImage();
        },
        child: Icon(Icons.add),
      ),
    );
  }

  Future<Null> pickImage() async {
    imageFile = await ImagePicker.pickImage(source: ImageSource.gallery);
    if (imageFile != null) {
      cropImage();
    }
  }

  Future<Null> cropImage() async {
    File croppedFile = await ImageCropper.cropImage(
      sourcePath: imageFile.path,
      aspectRatioPresets: Platform.isAndroid
          ? [
              CropAspectRatioPreset.square,
              CropAspectRatioPreset.ratio3x2,
              CropAspectRatioPreset.original,
              CropAspectRatioPreset.ratio4x3,
              CropAspectRatioPreset.ratio16x9
            ]
          : [
              CropAspectRatioPreset.original,
              CropAspectRatioPreset.square,
              CropAspectRatioPreset.ratio3x2,
              CropAspectRatioPreset.ratio4x3,
              CropAspectRatioPreset.ratio5x3,
              CropAspectRatioPreset.ratio5x4,
              CropAspectRatioPreset.ratio7x5,
              CropAspectRatioPreset.ratio16x9
            ],
      androidUiSettings: AndroidUiSettings(
          toolbarTitle: 'Cropper',
          toolbarColor: Colors.deepOrange,
          toolbarWidgetColor: Colors.white,
          initAspectRatio: CropAspectRatioPreset.original,
          lockAspectRatio: false),
      iosUiSettings: IOSUiSettings(
        title: 'Cropper',
      )
    );
    if (croppedFile != null) {
      imageFile = croppedFile;
      setState(() {
      });
    }
  }
}

在此记录，希望能帮到需要的童鞋快速找到这可裁剪库