Latest 3.0.0
License MIT
Platforms ios 8.0, requires ARC


In some cases, we need to distinguish between different devices to set UI, but Adaptive Layout can not do that. So, there is a Ruler.


Swift 4, iOS 8.0

(Swift 3, use version 1.0.1)


If we only consider iPhone’s width, iPhone 5 has the same width of iPhone 4s, iPhone 6 has a bigger width, iPhone 6 Plus’ width even bigger than iPhone 6, and iPhone X’s width is the biggest. Only four widths.

But if we consider full screen size of iPhone, there are five models, because iPhone 5’s height is different from iPhone 4s’.

If our app is universal, we need consider iPad, there are two models (in points).

So all we need consider five cases as follows:

enum Ruler<T> {
    case iPhoneHorizontal(T, T, T)
    case iPhoneVertical(T, T, T, T, T)
    case iPad(T, T)
    case universalHorizontal(T, T, T, T, T)
    case universalVertical(T, T, T, T, T, T, T)

In real world (thanks generics, Ruler can match anything for different sizes of iOS devices):

import Ruler
// size, off course

let width = Ruler.iPhoneHorizontal(10, 20, 30).value
let height = Ruler.iPhoneVertical(5, 10, 20, 30, 40).value

// or color

colorView.backgroundColor = Ruler.universalVertical(,,,, UIColor.yellow, UIColor.purple, UIColor.cyan).value

// even closures

typealias Greeting = () -> Void

let greeting: Greeting = Ruler.universalVertical(
{ print("Hello!") },
{ print("Hi!") },
{ print("How are you!") },
{ print("How do you do!") },
{ print("好久不见!") },
{ print("你好!") },
{ print("很高兴见到你!") }).value


// ...

Special offer

Detect if this device is an iPhone X:

if ScreenModel.isPhoneX {
    print("It's an iPhone X. You're rich!")


Feel free to drag Ruler.swift to your iOS Project. But it’s recommended to use Carthage (or CocoaPods).


github "nixzhu/Ruler"


pod 'Ruler'


NIX @nixzhu


Ruler is available under the MIT license. See the LICENSE file for more info.

Latest podspec

    "name": "Ruler",
    "version": "3.0.0",
    "summary": "Size matters, you need a ruler.",
    "description": "In some cases, we need to distinguish between different devicesnto set UI, but Adaptive Layout can not do that. So, there is a Ruler.",
    "homepage": "",
    "license": {
        "type": "MIT",
        "file": "LICENSE"
    "authors": {
        "nixzhu": "[email protected]"
    "social_media_url": "",
    "platforms": {
        "ios": "8.0"
    "source": {
        "git": "",
        "tag": "3.0.0"
    "source_files": "Ruler/*.swift",
    "requires_arc": true

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