# How to convert Degrees to Radians in Swift

## Table of Contents

In this article, we will learn different ways to convert **Degrees to Radians** in iOS.

## What is Radian

There are **two different units** used to measure an angle

- Radians
- Degrees

I think degrees are easier to understand for most people, including me, but the fact that radian is heavily used in **physics and engineering** makes it more **popular in calculation-related API**.

That's why you will see **most APIs in iOS use radians instead of degrees.**

Here is an example of an API to create a rotation transform. **The API accepts an angle in radians.**

`let view = UIView()`

view.transform = CGAffineTransform(rotationAngle: .pi)

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## How to convert Degrees to Radians in iOS

There are many ways to convert Degrees to Radians. I will show you different ways to do it in iOS.

## Function to convert Degrees to Radians in iOS

We can easily convert between degrees and radians using simple math.

- A complete rotation angle in
**radians**unit is**2π Radians**. - A complete rotation angle in
**degrees**unit is**360 Degrees**.

**So, 1 Degree = 2π Radians/360 = π Radians/180**

We can create a Swift helper function like this:

`func degreesToRadians(_ degrees: Double) -> Double {`

return degrees * .pi / 180

}

We can use this function to pass degree to a function that accepts radians like this:

`let view = UIView()`

view.transform = CGAffineTransform(rotationAngle: degreesToRadians(180))

## Extension to convert Degrees to Radians in iOS

Instead of a function, you can create an extension for this.

`extension Double {`

var radiansUnit: Double {

return self * .pi / 180

}

}

## Convert Degrees to Radians using SwiftUI

SwiftUI has a dedicated `Angle`

type.

`Angle`

type allows us to:

**Initialize**by either**Degress and Radians**.- Getting a value in either
**Degress and Radians**unit.

I think this is the perfect type for this job.

But the `Angle`

struct is **defined under the SwiftUI module**, so you must import the `SwiftUI`

module before using it.

`import SwiftUI`

let angleInDegrees = Angle(degrees: 180)

let angleInRadians = angleInDegrees.radians

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## Convert Degrees to Radians using Measurement structure

Apple also got a `Measurement`

struct, which is a struct used to **describe a unit of measure**.

It supports a wide range of units, and angle (`UnitAngle`

) is one of them.

The `Measurement`

struct has built-in methods for **calculation and conversion**.

Here is how you use it.

`let degrees = Measurement(value: 180, unit: UnitAngle.degrees)`

let radians = degrees.converted(to: .radians)

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