---
title: "speed(_:)"
framework: swiftui
role: symbol
role_heading: Instance Method
path: "swiftui/animation/speed(_:)"
---

# speed(_:)

Changes the duration of an animation by adjusting its speed.

## Declaration

```swift
func speed(_ speed: Double) -> Animation
```

## Parameters

- `speed`: The speed at which SwiftUI performs the animation.

## Return Value

Return Value An animation with the adjusted speed.

## Discussion

Discussion Setting the speed of an animation changes the duration of the animation by a factor of speed. A higher speed value causes a faster animation sequence due to a shorter duration. For example, a one-second animation with a speed of 2.0 completes in half the time (half a second). struct ContentView: View {     @State private var adjustBy = 100.0

private var oneSecondAnimation: Animation {        .easeInOut(duration: 1.0)     }

var body: some View {         VStack(spacing: 40) {             HStack(alignment: .bottom) {                 Capsule()                     .frame(width: 50, height: 175 - adjustBy)                 Capsule()                     .frame(width: 50, height: 175 + adjustBy)             }             .animation(oneSecondAnimation.speed(2.0), value: adjustBy)

Button("Animate") {                 adjustBy *= -1             }         }     } } Setting speed to a lower number slows the animation, extending its duration. For example, a one-second animation with a speed of 0.25 takes four seconds to complete. struct ContentView: View {     @State private var adjustBy = 100.0

private var oneSecondAnimation: Animation {        .easeInOut(duration: 1.0)     }

var body: some View {         VStack(spacing: 40) {             HStack(alignment: .bottom) {                 Capsule()                     .frame(width: 50, height: 175 - adjustBy)                 Capsule()                     .frame(width: 50, height: 175 + adjustBy)             }             .animation(oneSecondAnimation.speed(0.25), value: adjustBy)

Button("Animate") {                 adjustBy *= -1             }         }     } }

## See Also

### Configuring an animation

- [delay(_:)](swiftui/animation/delay(_:).md)
- [repeatCount(_:autoreverses:)](swiftui/animation/repeatcount(_:autoreverses:).md)
- [repeatForever(autoreverses:)](swiftui/animation/repeatforever(autoreverses:).md)