How to customize font size in Ionic Framework

15
votes

I'm using ionic framework (with cordova) to develop mobile apps. What I want to do is to increase the font size (in general in my app).

I've seen that in the official documentation : http://ionicframework.com/tutorials/customizing-ionic-with-sass/. But I do not understand how to customize once sass is working.

I'm working in a tabs-based App like that : http://forum.ionicframework.com/uploads/default/269/9934610f0a08b8d2.png I tried to manually add a class on the tab, but the result is not very clean... the text is cropped...

Is there an official way to change the font-size ?

7
cssfont-sizeionic-framework

7 Answers

22
votes

I think you don't need to undersand everything on Sass. In your project directory, in

.../yourProject/www/lib/ionic/scss

There is a file named _variables.scss where you will see something like this : enter image description hereenter image description here These are font-size variables, you just have to change these and then build the ionic css file. I suggest you to use https://prepros.io/. I hope it helped you.

7
votes

Figured I'd share what I've learnt in Ionic.

Basically, Ionic has a default set of sizes, colors, fonts for every single thing you can design and this set is stored in the _variables.scss file. This file is at lib/ionic/scss/_variables.scss

Open this file and search for what you want to alter. For example, I needed to increase the header font-size. So I searched in the _variables.scss file and found $bar-title-font-size.

It was defined as $bar-title-font-size: 17px !default;

Now, open your ionic.app.scss file and write something like

$bar-title-font-size: 25px !default;

***Remember to write the above statement before the @import "ionic/scss/ionic"; statement.

Save the file and your changes will instantly take effect. Ionic has made it that simple!!! :)

6
votes

Search your project/www/css and edit style.css, and inside the file write:

{font-size:55px !important;}

change 55px to whatever size you need.

2
votes

Often you want to decide when to use which icon size so I came up with the following solution.

CSS

/* Ionicon icons resizing css */
.ion-1x { font-size: 24px !important;}
.ion-2x { font-size: 48px !important;}

HTML 

// in iconics framework
<ion-icon name="logo-pinterest" class="ion-1x"></ion-icon>
<ion-icon name="logo-twitter" class="ion-2x"></ion-icon>

// without ionics framework
<i class="ion-1x ion-social-pinterest"></i>
<i class="ion-2x ion-social-twitter"></i>
2
votes

To make responsive font-size according to device for ionic2, Add this in src/theme/variables.scss

// breakpoint mixin
@mixin breakpoint($mq01: 0, $mq2: false, $maxmin: max-width) {
  @if $mq2 == false {
      @media ($maxmin: $mq01) {
          @content;
      }
  }
  @else {
      @media (min-width: $mq01) and (max-width: $mq2) {
          @content;
      }
  }
}

// breakpoint variables
$lg: 1170px;
$md: 1024px;
$sm: 640px;
$xs: 480px;

// responsive font size mixin
@mixin font-size-map($font-size-map) {
    @each $breakpoint, $font-size in $font-size-map {
        @if $breakpoint == null {
            font-size: $font-size;
        } @else {
            @include breakpoint($breakpoint) {
                font-size: $font-size;
            }
        }
    }
}

// font sizes

$html-font-size: (null: 16px, $md: 15px, $sm: 14px, $xs: 13px);
$paragraph-font-size: (null: 18px, $lg: 17px, $md: 16px, $sm: 15px, $xs: 14px);

include variable in local scss by adding: @include font-size-map($html-font-size);

// html

html {
    @include font-size-map($html-font-size);
}

p {
    @include font-size-map($paragraph-font-size);
}
0
votes

Newer versions of Ionic (4 + 5) use CSS variables.

However, there is no variable for the font size. So, you can add a line like this to variables.css:

body ion-content {
  font-size: 1.25rem;
}

Further reading

-1
votes

I use Ionic for my apps and this is how I deal with resizing:

  1. Find the class/element that you need to modify in CSS
  2. Set padding:0 0 0 0; or to values you want (top,right,bottom,left).
  3. Set font size
  4. Set height
  5. Set line-height

Edit: This is how I modified my tab items

.tab-item{
    margin: 0;
    line-height: 100px;
    box-sizing: content-box;
    font-size: 40px;
    color:#FFFFFF;
    font-family: 'Roboto-Light';
    opacity: 1;
    max-width: 200px;
}