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marchv/UIScreenExtension
UIScreenExtension
This is an extension to UIScreen that provides information about the pixel density (or point density) of iPhones and iPads. For example this can be used to:

compute the dimension of the screen

draw a ruler; or

to show a proper ECG graph on the iPhone's screen.
public extension UIScreen { /// The number of pixels per inch for this device public static let pixelsPerInch: CGFloat? /// The number of pixels per centimeter for this device public static let pixelsPerCentimeter: CGFloat? /// The number of points per inch for this device public static let pointsPerInch: CGFloat? /// The number of points per centimeter for this device public static let pointsPerCentimeter: CGFloat? /// The screen dimension in inches public static let dimensionInInches: CGSize? /// The screen dimension in centimeters public static let dimensionInCentimeters: CGSize? }
The constants will be set to .none
if the device is unknown. This can happen if Apple releases a new iPhone, so please remember to deal with this in your code.
Installation and use
The extension can be installed using Cocoapods by adding below line to your Podfile
:
pod 'UIScreenExtension', :git => 'https://github.com/marchv/UIScreenExtension'
To use the extension in your code first import it by adding:
import UIScreenExtension
And then use it for example:
if let pointsPerCentimeter = UIScreen.pointsPerCentimeter {
// code
}
Or to compute the diagonal screen dimension:
if let dimensionInInches = UIScreen.dimensionInInches {
print(sqrt(pow(dimensionInInches.width, 2) + pow(dimensionInInches.height, 2))) // for example ~5.5 inches for iPhone 7 Plus
}
Support
The extension supports all iPhones, iPods and iPads that are supported by iOS 912.
Limitations
Please note that iPhone only apps upscaled on iPads will not work properly!
Improvements
 Apple Watch support
 Objective C support
 Fetch information about new iPhone models from internet
Author
:)
Github
link 
Stars: 48 
Last commit: 2 days ago 