Ionic 4 tabs: How to create custom tabs - ionic4

Question

I am trying to style my tabs to look like what's shown in the link.
.
I currently have the default tab style and I don't know how to go about adjusting it to look like what is shown in the linked image. Any help from the community will be appreciated.

Answer 1

Here is my crack at it,
TESTED ON CHROME Pixel 2 XL emulator this is important because the variables I used will absolutely look different on different screen ratios. I personally used 411x823 which is the screen dimension on a Pixel 2 XL phone. You will need to handle all of the necessary screen dimension cases on your own through css media queries to get a general solution.
Initial Screen: this is what I started with. I started with what looks like the default tabs ionic application. Like what you have. Since we're dealing with only html and scss that is what I will show.
tabs-page.scss starting file.
.tabbar {
justify-content: center;
}
.tab-button {
max-width: 200px;
}
::ng-deep ion-icon.icon-button {
background: var(--ion-color-primary-tint)!important;
color: white;
border-radius: 50%!important;
}
tabs-page.html starting file.
<ion-tabs>
<ion-tab-bar *ngIf="tabSlot === 'bottom'" slot="bottom">
<ion-tab-button tab="marketplace">
<ion-icon mode="md" name="home"></ion-icon>
<ion-label>Marketplace</ion-label>
</ion-tab-button>
<ion-tab-button tab="friends">
<ion-icon name="contacts"></ion-icon>
<ion-label>Friends</ion-label>
<ion-badge *ngIf="friendCount > 0" color="danger">{{friendCount}}</ion-badge>
</ion-tab-button>
<ion-tab-button (click)="openRequestPage()">
<ion-icon name="add-circle-outline" class="icon-button"></ion-icon>
<ion-label>Request</ion-label>
</ion-tab-button>
<ion-tab-button tab="notifications">
<ion-icon name="notifications"></ion-icon>
<ion-label>Notifications</ion-label>
<ion-badge *ngIf="notificationCount > 0" color="danger">{{notificationCount}}</ion-badge>
</ion-tab-button>
<ion-tab-button tab="settings">
<ion-icon name="settings"></ion-icon>
<ion-label>Settings</ion-label>
</ion-tab-button>
</ion-tab-bar>
</ion-tabs>
End Screen: This is what you're looking for in a rough sense.
End result: this is what I ended up creating from the code I had started with. The solution involves using the box-shadow css attribute to give the "negative" border-radius styling. And then what you need to do is position your center button slightly above your tab-bar. I used this tutorial to guide me. Also looking up how box-shadow works helps with getting the specifics sorted out.
tabs-page.scss ending file.
.tabbar {
justify-content: center;
}
.tab-button {
max-width: 200px;
}
::ng-deep ion-icon.icon-button {
background: var(--ion-color-primary-tint)!important;
color: white;
border-radius: 50%!important;
}
:host ::ng-deep .tabs-inner {
position: unset!important;
contain: size style!important;
}
.bottom-tab-bar {
--background: transparent;
--border: 0;
}
ion-tab-button {
--background: beige;
}
.button-center {
--background: transparent!important;
ion-icon {
height: 50px;
width: 50px;
font-size: 75px;
}
}
ion-tab-bar {
&:before {
box-shadow: 0 387px 0 300px beige;
position: absolute;
margin-top: -48px;
padding: 56px;
border-radius: 65%;
content: '';
}
}
.inner-left-btn {
border-radius: 0 39% 0 0; // create the curved style on the left side of the center
}
.inner-right-btn {
border-radius: 39% 0 0 0; // create the curved style on the right side of the center
}
.inner-center-btn {
position: absolute;
left: calc(50% - 35px); // position your button in the center
bottom: 20px; // position your button slightly above the half bezel
font-size: 70px;
--background: transparent;
}
tabs-page.html ending file.
<ion-tabs>
<ion-icon name="add-circle-outline" class="icon-button inner-center-btn" (click)="openRequestPage()"></ion-icon>
<ion-tab-bar *ngIf="tabSlot === 'bottom'" slot="bottom" class="bottom-tab-bar">
<ion-tab-button tab="marketplace">
<ion-icon mode="md" name="home"></ion-icon>
<ion-label>Marketplace</ion-label>
</ion-tab-button>
<ion-tab-button tab="friends" class="inner-left-btn">
<ion-icon name="contacts"></ion-icon>
<ion-label>Friends</ion-label>
<ion-badge *ngIf="friendCount > 0" color="danger">{{friendCount}}</ion-badge>
</ion-tab-button>
<ion-tab-button class="button-center">
<div></div>
</ion-tab-button>
<ion-tab-button tab="notifications" class="inner-right-btn">
<ion-icon name="notifications"></ion-icon>
<ion-label>Notifications</ion-label>
<ion-badge *ngIf="notificationCount > 0" color="danger">{{notificationCount}}</ion-badge>
</ion-tab-button>
<ion-tab-button tab="settings">
<ion-icon name="settings"></ion-icon>
<ion-label>Settings</ion-label>
</ion-tab-button>
</ion-tab-bar>
</ion-tabs>