更改页脚图标 ......在 android 中完美运行但不是 ios
<Button class="footer-class" textWrap="true" (tap)="onNavItemTap('/profile')" *ngIf="isLoggedIn">
<FormattedString>
<Span fontFamily="FontAwesome" [text]="profile" class="icon-style fa"></Span>
<Span text="
profile" class="footer-title"></Span>
</FormattedString>
</Button>
<Button class="footer-class" textWrap="true" (tap)="onNavItemTap('/contactus')">
<FormattedString>
<Span fontFamily="FontAwesome" [text]="contactus" class="icon-style fa"></Span>
<Span text="
contactus" class="footer-title"></Span>
</FormattedString>
</Button>