Ionic 4 change ion-tab-button with custom icon

Question

I'm trying to change ion-icon with custom src after ion-tab-button is clicked

What I have tried, using (click) event to trigger function and change the [src]="..." inside the ion-icon

Is there any proper way to change this hackish style?

HTML:

 <ion-tabs>
  <ion-tab-bar slot="bottom">
    <ion-tab-button tab="news/home" (click)="changeNewsIcon()">
      <ion-icon [src]="newsIcon"></ion-icon>
      <ion-label class="tab-title">News</ion-label>
    </ion-tab-button>
    <ion-tab-button tab="user" (click)="changeSearchIcon()">
      <ion-icon [src]="searchIcon"></ion-icon>
      <ion-label class="tab-title">Search</ion-label>
    </ion-tab-button>
    <ion-tab-button tab="networking" (click)="changeNetworkIcon()">
      <ion-icon [src]="notiIcon"></ion-icon>
      <ion-label class="tab-title">Networking</ion-label>
    </ion-tab-button>
    <ion-tab-button tab="chat" (click)="changeChatIcon()">
      <ion-icon [src]="chatIcon"></ion-icon>
      <ion-label class="tab-title">Chat</ion-label>
    </ion-tab-button>
    <ion-tab-button tab="profile" (click)="changeProfIcon()">
      <ion-icon [src]="profIcon"></ion-icon>
      <ion-label class="tab-title">Profile</ion-label>
    </ion-tab-button>
  </ion-tab-bar>
</ion-tabs>

TS :

newsIcon = './assets/tabs/home.svg';
searchIcon = './assets/tabs/search.svg';
notiIcon = './assets/tabs/group.svg';
chatIcon = './assets/tabs/chat.svg';
profIcon = './assets/tabs/user.svg';

changeNewsIcon(): void {    
  // change news icon
  this.newsIcon = './assets/tabs/clicked-home.svg';

  // reset others icon
  this.searchIcon = './assets/tabs/search.svg';
  this.notiIcon = './assets/tabs/group.svg';
  this.chatIcon = './assets/tabs/chat.svg';
  this.profIcon = './assets/tabs/user.svg';
}

changeSearchIcon(): void {
  // change user icon
  this.searchIcon = './assets/tabs/clicked-search.svg';

  // reset others icon
  this.newsIcon = './assets/tabs/home.svg';
  this.notiIcon = './assets/tabs/group.svg';
  this.chatIcon = './assets/tabs/chat.svg';
  this.profIcon = './assets/tabs/user.svg';
}

...

Appreciate if anyone would help

Answer 1

Before, I tried to put css color into ion-tab-button and ion-icon with an ionic icon. The color change as expected, but not with custom icon.

<ion-tab-button tab="news/home" style="color: blue">
  <ion-icon name="home"></ion-icon>
  <ion-label class="tab-title">News</ion-label>
</ion-tab-button>

After a day, I try to check why the custom icon won't change the color if we do like this method. Then I try to check the Ionic SVG icon layers in Adobe Illustrator CC. and there is it.

As you can see there is <path> inside layer 1 (Ionic icon)

And the problem is my SVG file. To make this work with css properties, I just need to edit the layer.

this is the result after editing the layer, work as expected :)

Solution: You just need to add color css and get the right layer SVG icon

Further, I will update how to use custom icon when the tab is active.

UPDATE 2:

This is the working html code:

<ion-tabs>
  <ion-tab-bar class="tab-bar" slot="bottom">
    <ion-tab-button tab="news/home">
      <ion-icon class="icon-news" src="./assets/tabs/md-custom-home.svg"></ion-icon>
      <ion-label class="tab-title">News</ion-label>
    </ion-tab-button>
    <ion-tab-button tab="search">
      <ion-icon class="icon-search" src="./assets/tabs/md-custom-search.svg"></ion-icon>
      <ion-label class="tab-title">Search</ion-label>
    </ion-tab-button>
    <ion-tab-button tab="networking">
      <ion-icon class="icon-networking" src="./assets/tabs/md-custom-networking.svg"></ion-icon>
      <ion-label class="tab-title">Networking</ion-label>
    </ion-tab-button>
  </ion-tab-bar>
</ion-tabs>

SCSS:

ion-tab-button {
  --color: #000000;
  --color-selected: #00cee5;
}

just make sure to use the right SVG ;)