如何在 Ionic 4 中将图片上传到 firebase?

How to upload pictures to firebase in Ionic 4?

我无法将图片上传到 Firebase。任何帮助将不胜感激。

有没有人熟悉如何在Ionic 4.0中上传图片到firebase?下面是用于在 Ionic 2 中工作的代码,但是现在当我单击按钮将图像上传到 firebase 时,它​​需要大约 30 秒来响应(单击),然后它永远不会将图像上传到 firebase。

我尝试使用本教程中的示例,但无法摆脱与 ImagePicker 相关的错误。 https://ionicthemes.com/tutorials/about/ionic-firebase-image-upload 任何帮助将不胜感激。

      <ion-card-content>
            <div>
                <img src="assets/img/add-an-image.png" (click)="selectPhoto()"/>     
            </div>
        </ion-card-content>

constructor(
    private afAuth: AngularFireAuth,
    private camera: Camera) {

        this.afAuth.authState.subscribe(user => {
        this.userId = user.uid;
        this.myPhotosRef = firebase.storage().ref(`/Photos/${ this.userId }/`);
      });
    }

  selectPhoto(): void {
    const options: CameraOptions = {
      quality: 100,
      destinationType: this.camera.DestinationType.FILE_URI,
      encodingType: this.camera.EncodingType.JPEG,
      mediaType: this.camera.MediaType.PICTURE,
      sourceType: this.camera.PictureSourceType.PHOTOLIBRARY,
    };

    this.camera.getPicture(options).then((imageData) => {
      console.log(options, 'get pic');
      this.myPhoto = imageData;
      this.uploadPhoto(this.myPhoto);
    }, error => {
      console.log('ERROR -> ' + JSON.stringify(error));
    });
  }

  private uploadPhoto(photoName: string): void {
    this.myPhotosRef.child(photoName)
      .putString(this.myPhoto, 'base64', { contentType: 'image/png' })
      .then((savedPicture) => {
        this.myPhotoURL = savedPicture.downloadURL;
      });
  }

确实有很多方法可以做到这一点,您可以使用响应和错误来跟踪发生了什么。启用 Web 控制台日志。

以下是如何执行此操作并跟踪错误的示例:

uploadFile(file){
const fileName = this.generateRandomName() + '.jpg';
const fileRef = firebase.storage().ref().child('tptimagefolder/'+ fileName);
const uploadTask = fileRef.put(file);

return new Promise((resolve, reject) => {
    uploadTask.on('state_changed', snapshot => {
},  error => {
      reject(error);

}, () => {
  uploadTask.snapshot.ref.getDownloadURL().then(function(downloadURL) {
    console.log('teste resolve url'+downloadURL);

    resolve ( {fileName, downloadURL});
  });

});

}); }

this.generateRandomName()是一个创建名字的函数,不用它也可以不用。

我能够使用以下教程成功将图像上传到 firebase:

https://ionicthemes.com/tutorials/about/building-a-ionic-firebase-app-step-by-step

我按照 Ionic Themes 中的教程将图像上传到 Firebase 存储:https://ionicthemes.com/tutorials/about/ionic-firebase-image-upload

它说它适用于 Ionic 3,但它也适用于 Ionic 4。

根据教程,Storage 与 firestore 和 fire storage 模块是分开的,所以在你的应用程序模块中,你必须像这样导入 firebase:

import * as firebase from "firebase";
firebase.initializeApp(environment.firebaseConfig)

在 Ionic 4 应用程序的 Firestore 上上传图片

查看本教程link

https://www.freakyjolly.com/ionic-4-image-upload-with-progress-in-firestore-and-firestorage-tutorial-by-application/