Ionic Radio button is checked in TS but display not checked

@lilaless wrote:

I’m trying to implement an App with some Questions. The User have to select an option. When the user have to navigate a page back so the previous radio buttons have to stay “checked”. But in HTML it’s does’nt display “checked”. But its checked!

Please let me know, what I make wrong.

This is my HTML

 <ion-item *ngFor="let op of question.body; let i = index">
          <ion-label>
            <div>{{op}}</div>
          </ion-label>
          <ion-radio [checked]="antworten[currentQuestion]===op? true: false"(ionSelect)="answerRadioButton(question.id,op)></ion-radio>  
        </ion-item>
       </ion-radio-group>
</ion-item>

This is my TS

  showQuestion(index: number) {
    this.select = this.answers[index]; 

    if (!this.select) {
      this.questionIsAnswered = false;
    } else {
      this.questionIsAnswered = true;
    }

    this.question = this.question[index];
  }

  answerRadioButton(question, answer) {
    this.answers[question.id] = answer;
    this.questionIsAnswered = true;
  }

**THIS IS NOT WORKING **
[checked]="antworten[currentQuestion]===op? true: false"

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