ionic4多选翻译

<ion-select
*ngSwitchCase="'MC'"
interface="action-sheet"
multiple="true"
cancelText="{{'Cancel'| translate}}"
okText="{{'Ok'| translate}}"
[class.invalid]="!isValid && ( isDirty || isSubmited)"
[formControlName] = 'question.questionId'>
<ion-select-option value="{{item.optionId}}" *ngFor="let item of question.optionList">{{item.title}}
</ion-select-option>
</ion-select>