---
title: SKViewDelegate
framework: spritekit
role: symbol
role_heading: Protocol
path: spritekit/skviewdelegate
---

# SKViewDelegate

Methods to take custom control over the view’s render rate.

## Declaration

```swift
protocol SKViewDelegate : NSObjectProtocol
```

## Mentioned in

Getting Started with Nodes

## Overview

Overview By setting a SpriteKit view’s delegate with an object that implements SKViewDelegate, you can precisely control the frame rate of a game or app. You may choose to do this to maintain a consistent frame rate for computationally intensive code or for special effects such as simulating cine film. The following Swift code shows an example of a class that implements the SpriteKit view delegate protocol to reduce the frame rate to a specified value. With each call of view(_:shouldRenderAtTime:), it checks the time since the last render and if that value exceeds the required frame duration (1 / fps), the method returns true and the frame is rendered. class ViewDelegate: NSObject, SKViewDelegate {     var lastRenderTime: TimeInterval = 0          let fps: TimeInterval = 3          public func view(_ view: SKView, shouldRenderAtTime time: TimeInterval) -> Bool {

if time - lastRenderTime >= 1 / fps {             lastRenderTime = time             return true         }         else {             return false         }              } } The return value of view(_:shouldRenderAtTime:) doesn’t change the speed of physics simulations and actions in a SpriteKit scene. However, if you return false, SpriteKit will skip updates and SKSceneDelegate methods are not called.

## Topics

### Instance Methods

- [view(_:shouldRenderAtTime:)](spritekit/skviewdelegate/view(_:shouldrenderattime:).md)

## Relationships

### Inherits From

- [NSObjectProtocol](objectivec/nsobjectprotocol.md)

## See Also

### Controlling the Timing of a Scene’s Rendering

- [isPaused](spritekit/skview/ispaused.md)
- [preferredFramesPerSecond](spritekit/skview/preferredframespersecond.md)
- [delegate](spritekit/skview/delegate.md)
- [frameInterval](spritekit/skview/frameinterval.md)
- [preferredFrameRate](spritekit/skview/preferredframerate.md)