$font-path: '../assets/fonts';
@font-face {
 font-weight: normal;
 font-style: normal;
 font-family: 'wecare';
 src: url('#{$font-path}/wecare.eot?l80w4l');
 src: url('#{$font-path}/wecare.eot?l80w4l#iefix') format('embedded-opentype'),
 url('#{$font-path}/wecare.ttf?l80w4l') format('truetype'),
 url('#{$font-path}/wecare.woff?l80w4l') format('woff'),
 url('#{$font-path}/wecare.svg?l80w4l#wecare') format('svg');
}

[class^="ion-"], [class*=" ion-"] {
   /* use !important to prevent issues with browser extensions that change fonts */
   font-family: 'wecare' !important;
   speak: none;
   font-style: normal;
   font-weight: normal;
   font-variant: normal;
   text-transform: none;
   line-height: 1;
   /* Better Font Rendering =========== */
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
}

 .wecare {
   text-transform: none;
   font-weight: normal;
   font-style: normal;
   font-variant: normal;
   font-family: 'wecare' !important;
   line-height: 1;
   /* Better Font Rendering =========== */
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
   speak: none;
  }
  .ion-ios-smart-outline:before, 
  .ion-ios-smart:before, 
  .ion-md-smart-outline:before, 
  .ion-md-smart:before, 
  .ion-ios-test-outline:before, 
  .ion-ios-test:before, 
  .ion-md-test-outline:before, 
  .ion-md-test:before {
   @extend .wecare;
  }

.ion-ios-smart-outline:before {
 content: '\e904';
}
.ion-ios-smart:before {
 content: '\e905';
}
.ion-md-smart-outline:before {
 content: '\e904';
}
.ion-md-smart:before {
 content: '\e905';
}
.ion-ios-test-outline:before {
 content: '\e900';
}
.ion-ios-test:before {
 content: '\e901';
}
.ion-md-test-outline:before {
 content: '\e900';
}
.ion-md-test:before {
 content: '\e901';
}

@import '../assets/fonts/wecare';
<ion-tabs>
 <ion-tab [root]="tab1Root" tabTitle="Now" tabIcon="test"></ion-tab>
 <ion-tab [root]="tab2Root" tabTitle="Assessment" tabIcon="information-circle"></ion-tab>
 <ion-tab [root]="tab3Root" tabTitle="Trends" tabIcon="contacts"></ion-tab>
 <ion-tab [root]="tab4Root" tabTitle="Smart" tabIcon="smart"></ion-tab>
 <ion-tab [root]="tab5Root" tabTitle="Settings" tabIcon="contacts"></ion-tab>
</ion-tabs>

  if (iconMode === 'ios' && !this._isActive && name.indexOf('logo-') < 0 && name.indexOf('-outline') < 0) {
     name += '-outline';
  }

<ion-tabs>
 <ion-tab [root]="tab1Root" (ionSelect)="change(0)" tabTitle="Now" tabIcon="{{test[0]}}"></ion-tab>
 <ion-tab [root]="tab2Root" (ionSelect)="change(1)" tabTitle="Assessment" tabIcon="information-circle"></ion-tab>
 <ion-tab [root]="tab3Root" (ionSelect)="change(2)" tabTitle="Trends" tabIcon="contacts"></ion-tab>
 <ion-tab [root]="tab4Root" (ionSelect)="change(3)" tabTitle="Smart" tabIcon="{{test[3]}}"></ion-tab>
 <ion-tab [root]="tab5Root" (ionSelect)="change(4)" tabTitle="Settings" tabIcon="contacts"></ion-tab>
</ion-tabs>
test: Array<string> = ["test", "", "", "smart", ""];
change(a: number) {
  if (this.platform.is("android")) {
   for (let i = 0; i < 5; i++) {
    if (i === a) {
     this.test[i] = this.test[i].split("-")[0];
    } else {
     this.test[i] = this.test[i].split("-")[0] + "-outline";
    }
   }
  }
}