Flutter 获取系统相册

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iOS需要再项目内配置plist文件，申请访问权

<key>NSPhotoLibraryUsageDescription</key>
<string>Example usage description</string>
<key>NSCameraUsageDescription</key>
<string>Example usage description</string>

在pubspec.yaml中添加依赖：

  image_picker: ^0.6.0+4

Future getImage() async {
    var image = await ImagePicker.pickImage(source: ImageSource.gallery);

    setState(() {
      if (image != null) _image = image;
    });
  }