FormData.append的参数2（'blobValue'）必须是仅Blob Ionic IOS的​​实例

Question

我正在尝试在离子应用程序中上传图像。上传在android中有效，但在iOS中却给了我错误。

  

FormData.append的参数2（'blobValue'）必须是   斑点

我使用以下内容捕获和分配图像

selectPhoto(): void {
    this.camera.getPicture({
      sourceType: this.camera.PictureSourceType.PHOTOLIBRARY,
      destinationType: this.camera.DestinationType.FILE_URI,
      quality: 70,
      allowEdit:true,
      targetHeight: 300,
      targetWidth: 300,
      encodingType: this.camera.EncodingType.PNG,
    }).then(imageData => {
      this.image = normalizeURL(imageData);
      this.uploadPhoto(imageData);
    }, error => {
      this.func.presentToast(JSON.stringify(error), 3000, 'bottom')
    });
  }

  uploadPhoto(imageFileUri: any): void {
    this.file.resolveLocalFilesystemUrl(imageFileUri)
      .then(entry => (<FileEntry>entry).file(file => this.readFile(file)))
      .catch(err => console.log('Error',JSON.stringify(err)));
  }

  private readFile(file: any) {
    const reader = new FileReader();
    reader.onloadend = () => {
      const imgBlob = new Blob([reader.result], { type: file.type });
      this.imageDataUri = imgBlob;
      this.imageName = Math.random().toString(36).substring(2, 15) + Math.random().toString(36).substring(2, 15);
      // alert(this.imageName)
    };
    reader.readAsArrayBuffer(file);
  }

并将blob分配为表单数据

formData.append('image', this.imageDataUri, this.imageName)

但是我仅在IOS中收到上述错误。

离子信息：

Ionic:

   ionic (Ionic CLI)  : 4.8.0 (/usr/local/lib/node_modules/ionic)
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.2.1

Cordova:

   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)
   Cordova Platforms     : android 6.4.0, browser 5.0.4, ios 4.5.5
   Cordova Plugins       : cordova-plugin-ionic-keyboard 2.1.3, (and 12 other plugins)

System:

   ios-deploy : 1.9.4
   NodeJS     : v10.15.0 (/usr/local/bin/node)
   npm        : 6.4.1
   OS         : macOS Mojave
   Xcode      : Xcode 10.1 Build version 10B61