How to make camera follow SKNode in Sprite Kit?

Something like this should help. I call the following from my didSimulatePhysics.

-(void)centerOnNode:(SKNode*)node {
    CGPoint cameraPositionInScene = [node.scene convertPoint:node.position fromNode:node.parent];
    cameraPositionInScene.x = 0;
    node.parent.position = CGPointMake(node.parent.position.x - cameraPositionInScene.x, node.parent.position.y - cameraPositionInScene.y);
}

I realize this is similar to Stuart Welsh's answer; however, I'd like to make his good answer a bit more comprehensive.

Basically, Apple recommends that you create a "world" node to contain all of your other nodes, with the world being a child of the actual scene; and further that you create a "camera" node as a child of the world node.

Then, from your scene, you can do something like:

[self centerOnCameraNamed:myCameraName];

Which calls the method (also in your scene):

- (void)centerOnCameraNamed:(NSString*)cameraName
{
  SKNode* world = [self childNodeWithName:worldName];
  SKNode* camera = [world childNodeWithName:cameraName];
  CGPoint cameraPositionInScene = [camera.scene convertPoint:camera.position fromNode:world];
  world.position = CGPointMake(world.position.x - cameraPositionInScene.x, world.position.y - cameraPositionInScene.y);
}

The new SKCameraNode seems like a very easy way to do this.

https://developer.apple.com/library/ios/documentation/SpriteKit/Reference/SKCameraNode/

Simply

1) create an SKCameraNode

// properties of scene class
let cam = SKCameraNode()
let player = SKSpriteNode()

2) add it to your scene camera property

// In your scene, for instance didMoveToView
self.camera = cam

3) make the camera follow your player position

override func update(currentTime: CFTimeInterval)
{
    /* Called before each frame is rendered */
    cam.position = player.position
}

Using SKCameraNode with SKConstraint in Swift 5.1

let camera = SKCameraNode()
camera.constraints = [.distance(.init(upperLimit: 10), to: node)]
scene.addChild(camera)
scene.camera = camera