i face this issue which is says about blocking cors policy and "it doesnot have have HTTP ok status

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• Error on build my app in xcode..shows an symbol(s) not found for architecture x86_64

  when i try to build ios...

  xcode shows an error as

  Undefined symbols for architecture x86_64: "_OBJC_CLASS_$_FIRComponent", referenced from: objc-class-ref in FirebaseAuth(FIRAuth.o) "_OBJC_CLASS_$_FIRComponentType", referenced from: objc-class-ref in FirebaseAuth(FIRAuth.o) "_OBJC_CLASS_$_FIRComponentContainer", referenced from: objc-class-ref in FirebaseAuth(FIRAuth.o) ld: symbol(s) not found for architecture x86_64 clang: error: linker command failed with exit code 1 (use -v to see invocation)

  this is an ionic project..for ios build through xcode

  
• nodejs crypto library in Ionic 4

  I am currently developing an Ionic 4 application and need to asymmetrically encrypt a small text string, I would like to use nodejs's crypto library to call crypto.privateDecrypt and crypto.publicEncrypt.

  I have tried importing the crypto library to my Ionic application by adding the following to the top of my file: import * as crypto from 'crypto'; which half does the job. But as soon as I try to run the application on my Android phone I get the following error, error TS2307: Cannot find module 'crypto'

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• FIXED-IONIC 3: property 'questions' does not exist on type 'Object'

  i'm having an error regarding this 1 line and I've tried different sources to fix it but unfortunately I can't. Any help through this? I'm running a simple quiz and don't mind the data presented atm.

  Here is my data.ts. Here is where I'm having trouble at.

  import { Injectable } from '@angular/core';
  import 'rxjs/add/operator/map';
  import { HttpClient } from '@angular/common/http';
  
  /*
    Generated class for the DataProvider provider.
  
    See https://angular.io/guide/dependency-injection for more info on providers
    and Angular DI.
  */
  @Injectable()
  export class DataProvider {
  
  
    data: any;
  
    constructor(public http: HttpClient) {
  
    }
  
    load(){
  
      if(this.data){
          return Promise.resolve(this.data);
      }
  
      return new Promise(resolve => {
  
          this.http.get('assets/data/questions.json').subscribe(data => {
              this.data = data.questions; <----------THIS IS LINE IS DISPLAYING ERROR
              resolve(this.data);
          });
  
      });
  
    }
  
  }
  

  Here is my json file which is named questions.json

  {
      "questions": [
  
          {
              "flashCardFront": "<img src='assets/questionimg/12_plate1.gif' />",
              "flashCardBack": "Helicopter",
              "flashCardFlipped": false,
              "questionText": "What is this?",
              "answers": [
                  {"answer": "Helicopter", "correct": true, "selected": false},
                  {"answer": "Plane", "correct": false, "selected": false},
                  {"answer": "Truck", "correct": false, "selected": false}
              ]
          },
          {
              "flashCardFront": "<img src='assets/questionimg/8_plate2.gif' />",
              "flashCardBack": "Plane",
              "flashCardFlipped": false,
              "questionText": "What is this?",
              "answers": [
                  {"answer": "Helicopter", "correct": false, "selected": false},
                  {"answer": "Plane", "correct": true, "selected": false},
                  {"answer": "Truck", "correct": false, "selected": false}
              ]
          },
          {
              "flashCardFront": "<img src='assets/questionimg/29_plate3.gif' />",
              "flashCardBack": "Truck",
              "flashCardFlipped": false,
              "questionText": "What is this?",
              "answers": [
                  {"answer": "Helicopter", "correct": false, "selected": false},
                  {"answer": "Plane", "correct": false, "selected": false},
                  {"answer": "Truck", "correct": true, "selected": false}
              ]
          }
  
      ]
  }
  

  my TypeScript file which is where I generate the quiz.

  import { Component, ViewChild} from '@angular/core';
  import { NavController} from 'ionic-angular';
  import { DataProvider } from '../../providers/data/data';
  
  /**
   * Generated class for the IshiharaQuestionsPage page.
   *
   * See https://ionicframework.com/docs/components/#navigation for more info on
   * Ionic pages and navigation.
   */
  
  @Component({
    selector: 'page-ishihara-questions',
    templateUrl: 'ishihara-questions.html',
  })
  
  export class IshiharaQuestionsPage {
  
    @ViewChild('slides') slides: any;
  
      hasAnswered: boolean = false;
      score: number = 0;
  
      slideOptions: any;
      questions: any;
  
    constructor(public navCtrl: NavController, public dataService: DataProvider) {
    }
  
    ionViewDidLoad() {
  
      this.slides.lockSwipes(true);
  
      this.dataService.load().then((data) => {
  
          data.map((question) => {
  
              let originalOrder = question.answers;
              question.answers = this.randomizeAnswers(originalOrder);
              return question;
  
          });     
  
          this.questions = data;
  
      });
  
    }
  
    nextSlide(){
      this.slides.lockSwipes(false);
      this.slides.slideNext();
      this.slides.lockSwipes(true);
    }
  
    selectAnswer(answer, question){
  
      this.hasAnswered = true;
      answer.selected = true;
      question.flashCardFlipped = true;
  
      if(answer.correct){
          this.score++;
      }
  
      setTimeout(() => {
          this.hasAnswered = false;
          this.nextSlide();
          answer.selected = false;
          question.flashCardFlipped = false;
      }, 3000);
    }
  
  
    randomizeAnswers(rawAnswers: any[]): any[] {
  
      for (let i = rawAnswers.length - 1; i > 0; i--) {
          let j = Math.floor(Math.random() * (i + 1));
          let temp = rawAnswers[i];
          rawAnswers[i] = rawAnswers[j];
          rawAnswers[j] = temp;
      }
  
      return rawAnswers;
  
    }
  
    restartQuiz() {
      this.score = 0;
      this.slides.lockSwipes(false);
      this.slides.slideTo(1, 1000);
      this.slides.lockSwipes(true);
    }
  }
  

  and lastly my ion-html file which I display my quiz.

  <ion-content>
  
    <ion-slides #slides>
  
        <ion-slide class="start-slide">
            <button ion-button color="primary" (click)="nextSlide()">Start!</button>
        </ion-slide>
  
        <ion-slide *ngFor="let question of questions; let i = index;">
  
            <h3>Question {{i+1}}</h3>
  
            <flash-card [isFlipped]="question.flashCardFlipped">
                <div class="flash-card-front" [innerHTML]="question.flashCardFront"></div>
                <div class="flash-card-back" [innerHTML]="question.flashCardBack"></div>
            </flash-card>
  
            <h3>{{question.questionText}}</h3>
  
            <ion-list no-lines radio-group>
  
                <ion-item *ngFor="let answer of question.answers; let i = index;">
  
                    <ion-label>{{i+1}}. {{answer.answer}}</ion-label>
                    <ion-radio (click)="selectAnswer(answer, question)" [checked]="answer.selected" [disabled]="hasAnswered"></ion-radio>
  
                </ion-item>
  
            </ion-list>
  
        </ion-slide>
  
        <ion-slide>
            <h2>Final Score: {{score}}</h2>
  
            <button (click)="restartQuiz()" ion-button full color="primary">Start Again</button>
  
        </ion-slide>
  
    </ion-slides>
  
  </ion-content>