Label numeric quantities with physical dimensions to allow locale-aware formatting and conversion between related units.
Framework
- Foundation
Units and Measurement
Topics
First Steps
struct MeasurementA numeric quantity labeled with a unit of measure, with support for unit conversion and unit-aware calculations.
class UnitAn abstract class representing a unit of measure.
class DimensionAn abstract class representing a dimensional unit of measure.
Conversion
class UnitAn abstract class that provides a description of how to convert a unit to and from the base unit of its dimension.
class UnitA description of how to convert between units using a linear equation.
Physical Dimension
class UnitA unit of measure for area.
class UnitA unit of measure for length.
class UnitA unit of measure for volume.
class UnitA unit of measure for rotation.
Mass, Weight, and Force
class UnitA unit of measure for mass.
class UnitA unit of measure for pressure.
Time and Motion
class UnitA unit of measure for acceleration.
class UnitA unit of measure for duration of time.
class UnitA unit of measure for frequency.
class UnitA unit of measure for speed.
Energy, Heat, and Light
class UnitA unit of measure for energy.
class UnitA unit of measure for power.
class UnitA unit of measure for temperature.
class UnitA unit of measure for luminance.
Electricity
class UnitA unit of measure for electric charge.
class UnitA unit of measure for electric current.
class UnitA unit of measure for electric potential difference.
class UnitA unit of measure for electric resistance.
Concentration and Dispersion
class UnitA unit of measure for concentration of mass.
class UnitA unit of measure for an amount-of-substance fraction.
Fuel Efficiency
class UnitA unit of measure for fuel efficiency.
See Also
Fundamentals
Numbers, Data, and Basic Values
Work with primitive values and other fundamental types used throughout Cocoa.
Strings and Text
Create and process strings of Unicode characters, use regular expressions to find patterns, and perform natural language analysis of text.
Collections
Use arrays, dictionaries, sets, and specialized collections to store and iterate groups of objects or values.
Dates and Times
Compare dates and times, and perform calendar and time zone calculations.
Data Formatting
Convert numbers, dates, measurements, and other values to and from locale-aware string representations.
Filters and Sorting
Use predicates, expressions, and sort descriptors to examine elements in collections and other services.