Question

我不知道到底是什么问题，但是当我单击按钮选择控制台中出现错误的图像时这是我的代码

_checkPermissions = async () => {
    try {
      const { status } = await Permission.askAsync(Permission.CAMERA);
      this.setState({ camera: status });
      const { statusRoll } = await Permission.askAsync(Permission.CAMERA_ROLL);
      this.setState({ cameraRoll: statusRoll });
    } catch (err) {
      console.log(err);
    }
  };
  findNewImage = async () => {
    try {
      this._checkPermissions();
      let result = await ImagePicker.launchImageLibraryAsync({
        mediaTypes: "Images",
        allowsEditing: true,
        quality: 1
      });

      if (!result.cancelled) {
        this.setState({
          image: result.uri
        });
      } else {
        console.log("cancel");
      }
    } catch (err) {
     // console.log(err);
    }
  };

Answer 1

对我来说，解决问题的方法是这样导入权限和imagePicker：

import * as Permissions from 'expo-permissions';
import * as ImagePicker from 'expo-image-picker';

代替此：

import Permissions from 'expo-permissions';
import ImagePicker from 'expo-image-picker';

这基本上是因为没有默认导出

Answer 2

它是getAsync()，而不是askAsync()

https://docs.expo.io/versions/latest/sdk/permissions/

未定义不是对象（评估'_expo.Permission.askAsync'）

2 个答案: