连续调用此函数两次(Firebase存储，Flutter)时，iOS应用程序崩溃

问题描述

我的应用程序在调用"_submit"时崩溃连续运行两次.我可以从图库中挑选图片并将其上传到Firebase Storage，但是如果再次调用它，整个应用程序将崩溃.

My app crashes when calling "_submit" function 2 times in a row.I can pick the picture from gallery and upload it to Firebase Storage but if I call it again the the whole app crashes.

通过此按钮:

 floatingActionButton: FloatingActionButton(
        onPressed: () => _submit(),

Submit调用类型为Database的提供者:

Submit calls a Provider of type Database :

Future<void> _submit() async {
    widget.database = Provider.of<Database>(context, listen: false);
    await widget.database
        .setPicture("regione/citta/comune/lavoro/IDArtista/profilo.png");
    return;
  }

该函数调用上传从"imgGallery()"拍摄的图片的函数.到数据库:

That calls a function that uploads a picture taken from "imgGallery()" to the database :

Future<void> setPicture(String pathStorage) async {
    try {
      final File file = await imgFromGallery();
      if (file == null) return;
      TaskSnapshot task =
          await FirebaseStorage.instance.ref(pathStorage).putFile(file);
      String image_url = await task.ref.getDownloadURL();
      return;
    } catch (e) {
      print(e);
      return;
    }
  }

imgGallery:

imgGallery :

Future<File> imgFromGallery() async {
  try {
    final ImagePicker _picker = ImagePicker();
    final PickedFile imageFile =
        await _picker.getImage(source: ImageSource.gallery, imageQuality: 50);

    //If there is no image selected, return.
    if (imageFile == null) return null;
    //File created.
    File tmpFile = File(imageFile.path);
    //it gives path to a directory - path_provider package.
    final appDir = await getApplicationDocumentsDirectory();
    //filename - returns last part after the separator - path package.
    final fileName = tmpFile.path.split('/').last;
    //copy the file to the specified directory and return File instance.
    return tmpFile = await tmpFile.copy('${appDir.path}/$fileName');
  } catch (e) {
    print(e);
    return null;
  }
}

使用实际设备而不是仿真器解决.

EDIT : Solved using a real device instead of emulators.

推荐答案

您在哪个设备中遇到此问题?我也有此错误，但仅在iOS模拟器上.它与Image_Picker包和FocusNode有关.在github上查看此问题

Which device are you experiencing this in? I'm also having this error but only on iOS emulator. It has to do with the Image_Picker package and the FocusNode. Look at this issue on github

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