Code Quality Rank: L3
Programming language: Swift
License: MIT License
Tags: Utility    
Latest version: v0.7.1

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Easy way to detect device environment:

Helps to:


AssistantKit is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "AssistantKit"


Device version information

To get the current device type, use:

let device = Device.type

switch device {
case .phone:      print("iPhone")
case .pad:        print("iPad")
case .pod:        print("iPod")
case .simulator:  print("Simulator")
default:          print("Unknown")

You can check the exact device version with next code. All possible values of version can be found in the Version enum, located in the Version.swift file.

switch Device.version {
case .phone5C:      print("iPhone 5C")
case .phone6:       print("iPhone 6")
case .phone6S:      print("iPhone 6S")
case .phone6Plus:   print("iPhone 6 Plus")
case .phone6SPlus:  print("iPhone 6 S Plus")
// and more iPhones

case .padAir:       print("iPad Air")
case .padAir2:      print("iPad Air 2")
case .padMini:      print("iPad Mini")
case .padPro:       print("iPad Pro")
// and more iPads

case .podTouch6:    print("iPod 6")
// and more iPods

case .simulator:    print("Simulator")
default:            print("Unknown device")

There are few properties that detect device type

Device.isPhone     // true for iPhones even if it's Simulator
Device.isPad       // true for iPads even if it's Simulator
Device.isPadPro    // true for iPad Pros even if it's Simulator
Device.isPod       // true for iPods
Device.isSimulator // true for Simulators
Device.isNotched   // true for newer device version with notch

To get raw device code use


Device screen parameters

Detecting screen size can be detected with next code. All possible values could be found in the Screen enum, located in Screen.swift.

switch Device.screen {
case .inches_4_7:  print("4.7 inches")
case .inches_5_5:  print("5.5 inches")
case .inches_7_9:  print("7.9 inches")
case .inches_9_7:  print("9.7 inches")
case .inches_12_9: print("12.9 inches")
default:           print("Other display")

Compare screens

Screen is cinfirming to Comparable protocol:

Screen.inches_3_5 < Screen.inches_4_0 // Will be `true`

Detecting screen family

Often it is required to assign different parameters based on specific screen resolution. There are 3 methods that will help you to detect what parameters to use. But first of all let me introduce ScreenFamily.

This is enum that breaks all possible screens into 3 groups:

  • .old: Reproduce old iPhones with 3.5 and 4.0 inches screens
  • .small: Other iPhones/iPods without iPhone 6 Plus
  • .medium: iPhone 6 Plus and iPad Mini
  • .big: iPad and iPad Pro

You can detect screen family by:

let family = Device.screen.family

And now back to methods:

Value by device type

To assign different values for iPhone and iPad devices you can use:

// Method definition
static public func size<T: Any>(phone phone: T, pad: T) -> T

// Usage example
let size = Device.size(phone: 13, pad: 15)
let font = UIFont(name: "Arial", size: CGFloat(size))

On iPhones your font size will be 13.0, on iPads 15.0

Value by ScreenFamily

Another method based on ScreenFamily:

// Method definition
static public func size<T: Any>(small small: T, medium: T, big: T) -> T

// Usage example
let otherSize = Device.size(small: 12, medium: 14, big: 15)
let otherFont = UIFont(name: "Arial", size: CGFloat(otherSize))

In this case for small screens your font will be 12.0, for medium 14.0 and for big 15.0 inches.

Important notice: By default if screen family can not be detected size method will assign small value.

Value by exact screen size

Also you can return value for specific screen size. There is another size method you can use. Incoming parameter should be a screen size. If it is not defined nearest value will be used. Code example:

// Method definition
static public func size<T: Any>(sizes sizes: [Screen : T]) -> T?

// Usage example
let sizes: [Screen: AnyObject] = [
   .inches_3_5: 12,
   .inches_4_0: 13,
   .inches_4_7: 14,
   .inches_9_7: 15
let exactSize = Device.size(sizes: sizes) as! Int
let _ = UIFont(name: "Arial", size: CGFloat(exactSize))

Important notice: This method can return nil if you pass an empty array as a parameter. Be careful with implicit unwrapping.

After that your font will be:

  • 12 for 3.5" inches (older devices)
  • 13 for iPhone 5, 5S
  • 14 for iPhone 6, 6Plus and iPad mini
  • and 15 for other iPads

Screen scale

switch Device.scale {
case .x1: print("Not retina")
case .x2: print("Retina 2X")
case .x3: print("Retina 3X")
default:  print("Unknown scale")

Also there is a property to detect if it's retina display:

Device.isRetina // true if device screen scale > 1.0

Interface orientation

There are two properties that will help you to know current orientation:

Device.isLandscape // true if landscape
Device.isPortrait  // true if portrait

Slide Over / Multitasking layout for iPad

To detect slide over layout on iPads just call:

Device.isSlideOverLayout // true if iPad is in multitasking / slide over layout

Detecting and comparing iOS version

You can detect iOS version in runtime. There are next different methods that will help you to do it:

 Device.osVersion                               // Current version as a `OSVersion` model

 Device.osVersion == Device.os12                // true if iOS 12.0
 Device.osVersion >= Device.os9                 // true if iOS >= 9.0
 Device.osVersion < Device.os11                 // true if iOS < 11.0

There are next constants representating Main iOS versions:


Working with directories

There are few helper methods to make access to Documents and Caches directoies easier. Take a look at code examples:

Bundle.documentsDirectoryURL           // URL to .DocumentDirectory
Bundle.documentsDirectoryPath          // Path to .DocumentDirectory
Bundle.cachesDirectoryURL              // URL to .CachesDirectory
Bundle.cachesDirectoryPath             // Path to .CachesDirectory

let filePath = "directory/filename.txt"
Bundle.filePathInDocumentsDirectory(toFile: filePath)  // Path to file in .DocumentDirectory
Bundle.filePathInCachesDirectory(toFile: filePath)     // Path to file in .CachesDirectory


Used to detect environment options. Right now there is only one property:

/// Return `true` if running unit tests


There is a way to get battery state and level with these methods. It will enable monitoring if it's not enabled yet.

Device.Battery.state // Represent `UIDeviceBatteryState`
Device.Battery.level // in range 0...1 -1 for simulators


  • [ ] Add tvOS support

Write me or make a pull request if you have any ideas what else functionality can be useful in this repo.


More Device-detecting libs


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

*Note that all licence references and agreements mentioned in the AssistantKit README section above are relevant to that project's source code only.