IRLSize

Getting Started

To run the example project, clone the repo and navigate to its root folder in Terminal. Run the following command to install dependencies in their proper location:

pod install --project-directory=Example

Use

All IRLSize methods have two versions: one that uses NSMeasurement (Measurement in Swift), and one that uses the IRLRawMillimeters type (a double measuring millimeters).

Important: Upgrading to IRLSize 2.0

IRLSize 2.0 switched the native unit for measurements from meters to millimeters to better manage what official Apple documentation there is on device sizes. This is a breaking change and as such the raw unit type changed from IRLRawLengthMeasurement to IRLRawMillimeters to avoid this change accidentally changing existing code by a factor of 1,000. If you were using NSMeasurement, no updates should be necessary, as it automatically converts between units.

Measuring an On-Screen Element

To find out the dimensions of a UIView in an iOS app, use one of the following properties:

Objective-C

// NSMeasurement Version
NSMeasurement<NSUnitLength *> *width = view.irl_physicalWidth;
NSMeasurement<NSUnitLength *> *height = view.irl_physicalHeight;

// Raw Version
//   `IRLRawMillimeters` is a `double` representing millimeters. 
IRLRawMillimeters rawWidth = view.irl_rawPhysicalWidth;
IRLRawMillimeters rawHeight = view.irl_rawPhysicalHeight;

If a view is on a secondary screen (i.e. if you’re using an external display) the measurements will be returned as nil.

Of course, this also works nicely in Swift:

Swift

// Measurement Version
let width = view.physicalWidth // type: Measurement<UnitLength>
let height = view.physicalHeight // type: Measurement<UnitLength>

// Raw Version
let rawWidth = view.rawPhysicalWidth // type: IRLRawMillimeters
let rawHeight = view.rawPhysicalHeight // type: IRLRawMillimeters

Sizing a View

If you want to ensure that a view matches a certain physical size, IRLSize provides transforms to help you out:

Objective-C

// NSMeasurement Version
NSMeasurement<NSUnitLength *> *desiredHeight =
[[NSMeasurement alloc] initWithDoubleValue:38.0
                                      unit:NSUnitLength.millimeters];

view.transform = [view irl_transformForPhysicalHeight:desiredHeight];

// Raw Version
view.transform = [view irl_transformForRawPhysicalHeight:38.0];

Swift

// Measurement Version
let desiredHeight = Measurement(value: 38, unit: UnitLength.millimeters)

view.transform = view.transform(forPhysicalHeight:desiredHeight)

// Raw Version
view.transform = view.transform(forRawPhysicalHeight:38);

Measuring a Device

If you just want to know the physical size of the screen, use the category on UIDevice for iOS or WKInterfaceDevice for watchOS:

Objective-C

// iOS
NSMeasurement<NSUnitLength *> *screenHeight = UIDevice.currentDevice.irl_physicalScreenHeight;
IRLRawMillimeters rawScreenHeight = UIDevice.currentDevice.irl_rawPhysicalScreenHeight;

// watchOS
NSMeasurement<NSUnitLength *> *screenHeight = WKInterfaceDevice.currentDevice.irl_physicalScreenHeight;
IRLRawMillimeters rawScreenHeight = WKInterfaceDevice.currentDevice.irl_rawPhysicalScreenHeight;

Swift

// iOS
let screenHeight = UIDevice.current.physicalScreenHeight
let rawScreenHeight = UIDevice.current.rawPhysicalScreenHeight

// watchOS
let screenHeight = WKInterfaceDevice.current.phsyicalScreenHeight
let rawScreenHeight = WKInterfaceDevice.current.rawPhysicalScreenHeight

Installation

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

pod "IRLSize"

Author

Jeff Kelley (SlaunchaMan@gmail.com) at Detroit Labs.

License

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