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Custom rules

Classes, IDs and Ti Elements

You can style your own classes, IDs, or any Ti Element with as many attributes as needed. You can also optionally target specific platforms, devices, or add conditional blocks with global variables.

Whether you want to style a Ti Element (also known as a markup element), a custom class prefixed with a period (.) or a custom id prefixed with a hash (#), the structure is as follows:

Modifier Key

  • For classes or IDs, you can use any name or convention you want. For example: .my-custom-class-name, .myCustomClassName, or #myIdName.
PurgeTSS v6.x and above

Keep in mind that PurgeTSS v6.x and above will convert your class names to Kebab-Case to match the auto-generated ones. For example: .myCustomClassName will be converted to .my-custom-class-name.

For existing projects, please set the missing option to true in config.js to get a report of any missing classes so you can update them to the new naming convention.

  • For Titanium Elements, use the exact name of the element, for example: Label, Button, or ScrollView.

Default, Platform, Device, or Conditional Blocks

  • To generate a global style, use either a lowercase default or an uppercase DEFAULT keyword.
  • To target a specific platform, use ios or android keywords.
  • To target a specific device, use tablet or handheld keywords.
  • To target a condition with a global variable, use [if=globalVariableName] keyword.

Property Values

  • For Titanium constants, Alloy Configuration Values, or Global Variables, always enclose them in quotes.
  • For color values, you can use hex, 8-digit hex, rgb(R,G,B), rgba(R,G,B,A), transparent, or any of the standard color names. It is recommended to use hex values for colors to avoid any possible issues with the opacity modifier.
  • For spacing values, you can use different types of units: em, rem, %, px, dp, cm, or in.
    • %, px, cm, or in - These values are passed without any conversion.
    • em or rem - Values in em or rem will be converted with this little formula: value * 16.
    • dp - For these values, the unit type will be removed and the value will remain intact.

'config.js' file example

module.exports = {
theme: {
'#main-banner': {
width: '300px',
height: '80px'
ios: {
'.gallery': {
height: 'Ti.UI.SIZE'
ios: {
android: {
hiddenBehavior: 'Ti.UI.HIDDEN_BEHAVIOR_GONE'
handheld: {
width: '250px'
tablet: {
width: '500px'
TextField: {
top: 10,
left: 20,
right: 20,
bottom: 0
'[if=Alloy.Globals.iPhoneX]': {
bottom: 'Alloy.CFG.iPhoneXNotchSize'
android: {
touchFeedback: true
Custom ‘./purgetss/styles/tailwind.tss’ file
// Property: TextField
// Description: A single line text field.
'TextField': { top: 10, left: 20, right: 20, bottom: 0 }
'TextField[if=Alloy.Globals.iPhoneX]': { bottom: Alloy.CFG.iPhoneXNotchSize }
'TextField[platform=android]': { touchFeedback: true }

// Custom Classes
'#main-banner': { width: '300px', height: '80px' }
'#main-banner[platform=ios]': { clipMode: Ti.UI.iOS.CLIP_MODE_DISABLED }

'.gallery': { height: Ti.UI.SIZE }
'.gallery[platform=ios]': { clipMode: Ti.UI.iOS.CLIP_MODE_ENABLED }
'.gallery[platform=android]': { hiddenBehavior: Ti.UI.HIDDEN_BEHAVIOR_GONE }
'.gallery[formFactor=handheld]': { width: '250px' }
'.gallery[formFactor=tablet]': { width: '500px' }