I have reviewed countless references to try to understand why my scene is not behaving the way i expected it to, such as this.
Here is my very simple SKScene (2 child nodes):
The scene has a SpriteNode (which covers the entire scene as a background image). This has a zPosition = 0.
The scene has a 2nd node (SKNode) which itself has another child (up to 2 levels). This has a zPosiiton - 2.
ALL nodes have .userInteractionEnabled = false
Issue:
When i click anywhere all i see is that the 1st child (SpriteNode) is touched. The 2nd child (SKNode) is never touch-detected.
Note that the z-ordering of the Nodes are being rendered as I expect them. It is the touch-detection that doesnt appear to be working.
Snippet of my touchesBegan method:
for touch in touches {
let touchLocation = touch.locationInNode(self)
let sceneTouchPoint = self.convertPointToView(touchLocation)
let touchedNode = self.nodeAtPoint(sceneTouchPoint)
if (touchedNode.name != nil) {
print("Touched = \(touchedNode.name! as String)")
}
}
I had a similar issue (background in z: 999 + spawning "ducks" nodes in z: <999) that I solved with the following code in Swift 4:
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch:UITouch = touches.first!
let positionInScene = touch.location(in: self)
let touchedNodes = self.nodes(at: positionInScene)
for touch in touchedNodes {
let touchName = touch.name
if (touchName != nil && touchName!.hasPrefix("pato_")) {
touch.removeFromParent()
}
}
}
I had several layers of nodes because I used a mask over my game with buttons to make selections and move forward. I had issues with the buttons not working until I made a "startState:Bool = true" and updated this to false when the start screen was clicked through. I then had each of my buttons on that start page to have && startState==true for there clicks to be taken. It may be that your clicks are being recorded - but its not the node you think you are using. I would put print("NodeXXX") on each entry in touches and give it a unique name so you can see where the touches are actually happening.
Hope that helps.
Best regards,
mpe
Related
I am creating a game where the user can move some fruits around in the scene. I want to user to be able to move only the fruits and not any other SKSpriteNode in the scene, so I wrote the code below to implement it. However the code doesn't work properly as I can't seem to be able to drag any of my sprites around, but rather they change position only when I stop touching the screen and they don't move by much anyway.
override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first
if let location = touch?.location(in: self){
let nodesTouched = nodes(at: location)
for node in (nodesTouched) {
if node is Fruit{
for t in touches {
let locationMoved = t.location(in: self)
node.position.x = locationMoved.x
node.position.y = locationMoved.y
}
}
}
}
}
Anyone knows what's wrong with it?
Thanks in advance!
I found a solution to this, which was to basically set the physicsBody.affectedByGravity property to false for that specific Fruit instance every time I touch it, and then set it back to true as soon as I stop touching it. that makes it possible to drag all the fruits everywhere I want.
I am trying to develop a basic game and I have a scene with several child nodes added to the root node. Each node has one of two names, either friend or enemy.
If a user touches one of the enemy nodes I want to remove all child nodes that are named enemy.
I have tried several things, but can't seem to get anything working.
In my touchesBegan function:
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
let touch = touches.first!
let location = touch.location(in: gameView)
let hitList = gameView.hitTest(location, options: nil)
if let hitObject = hitList.first {
let node = hitObject.node
//This doesn't work
gameScene.rootNode.childNodes(passingTest: { (node, UnsafeMutablePointer<ObjCBool>) -> Bool in
node.removeFromParentNode()
}
}
I have also tried to use gameScene.rootNode.enumerateChildNodes(withName:) but I can't get that working either.
What I can get working is if I do something like this in there instead:
if node.name == "enemy" {
node.removeFromParentNode()
}
However this will only remove the single node that was hit, not all of them. How can I get all of the child nodes with a certain name in Swift with Scene Kit?
Filter out the nodes with matching name and remove them from the parent node:
gameScene.rootNode.childNodes.filter({ $0.name == "Enemy" }).forEach({ $0.removeFromParentNode() })
I have a few button with amorphous look. (the Rect of the buttons are intersecting) First I evaluated the BeganTouch in the GameScene. Then I get several touches.
Since I have in my buttons still child nodes, they have swallowed the touchs. Ok, I have made with the help of here a subclass of the SpriteNodes and processed the touch inside the subclass. Now I have the problem that the first button does not pass the touch to the underlying sprites.
But now I would like top ignore the transparent areas of the buttons, how can I do that?
I have read that one can work with physicsbody, I have tried, gravitiy = 0 but since I move and scale the buttons via actions there were violent effects.
Why can I check for the alpha in the touch location and pass the touch to the next sprite.
by the way: how can I get a reference to the view? to get the global loc.
let loc = touch.location(in: view)
with the global touch location I could check all sprites under this point for the alpha!
you can try passing the touch to it's parent (presumably the scene) from your subclass.
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first as UITouch! {
//handle whatever code you want your subclass to do
...
//pass the touch event to the parent
super.touchesBegan(touches, with: event)
}
}
and then in your scene, cycle through the your buttons (in this example I have the buttons in a button array)
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let touch = touches.first as UITouch! {
let touchLocation = touch.location(in: self)
for button in buttons {
if button.contains(touchLocation) {
//handle all other buttons
...
}
}
}
}
although this seems a little redundant to do the touches in two different locations. #Knight0fDragon is correct, it seems odd to have a button have transparent areas.
ok, it's simple, all buttons are from the same subclass. this subclass delegates to an method in the GameScene. here I can check with
allNodes = nodes(at: globalLocation)
now I can check for the name of the node, calculate the point of the pixel inside each node and get the alpha value.
thanxs all
I am trying to implement an overriden touchesMoved func to enable SKSpriteNodes to be moved around by the user. However, I have to move the node very slowly for it to follow my touches when I drag. In addition, there are three SKSpriteNodes in the background (which you will see I explicitly set to .userInteractionEnabled = false) and these nodes will occasionally respond to the touches. Any help would be greatly appreciated. Let me know if there are any other parts of the code you need.
override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
var positionInScene = CGPoint(x: 375.0, y: 400.0) //sets a default position
titleLabel.userInteractionEnabled = false
drawingBoard.userInteractionEnabled = false
sideBar.userInteractionEnabled = false
for touch in touches {
positionInScene = touch.locationInNode(self)
if self.nodeAtPoint(positionInScene) is SKSpriteNode {
if (self.nodeAtPoint(positionInScene)).name == movableNodeName { //movableNodeName is the name assigned to all SKSpriteNodes that should be draggable
//I know this might be a strange way of doing it
(self.nodeAtPoint(touch.previousLocationInNode(self))).position = positionInScene
}
}
}
}
I've managed to fix this issue by just setting the coordinates of the node that shouldn't move back to what they were originally whenever it is moved. This seems to work as I haven't been able to replicate the bug again in testing. If anyone could come up with a better solution though, I would love to hear it.
Your problem is you are using touch.locationInNode(self), where self is your SKSpriteNode. This means that your touch move code will only respond to what is going on inside of your SKSpriteNode. What you need to do, is use either the parent of the sprite, or the scene, based on how you want to apply this logic.
I am building a game in which the player drags a piece around the gameboard. I wish to know what are all of the nodes underneath that piece, and I am getting odd results. Here is the touchesMoves func:
override func touchesMoved(touches: NSSet!, withEvent event: UIEvent!) {
let touch = touches.anyObject() as UITouch
let location = touch.locationInNode(self.parent)
self.position = location
println("checker x: \(location.x)")
println("node at point: \(self.nodeAtPoint(location))")
println("nodes at point: \(self.nodesAtPoint(location))")
}
The sprite moves around the board just fine, but what is reported as the nodeAtPoint is always the sprite being moved around (which kind of makes sense but is not useful. Any oddly, the nodesAtPoint is always reported as an empty array! How is this possible? What should I be doing differently?
Update: This continues to be a struggle. I want to keep the touch methods in the node itself, and not the scene. The most recent version of the touchesMoved is the following:
override func touchesMoved(touches: NSSet!, withEvent event: UIEvent!) {
// Turn off the touched bool:
touched = false
let touch = touches.anyObject() as UITouch
let location = touch.locationInNode(self.parent)
let loc = touch.locationInView(scene.view)
let loc2 = touch.locationInNode(scene)
self.position = location
println("checker: \(loc2.x), \(loc2.y)")
println("node at point: \(self.nodeAtPoint(loc2).name)")
println("nodes at point: \(self.nodesAtPoint(loc2))")
}
The nodesAtPoint array continues to be empty with one really odd exception. When hovering near the center of the scene, I get this:
nodes at point: [ name:'(null)' accumulatedFrame:{{-30, -19.80000114440918}, {60, 39.600002288818359}}]
There is not shape node there that I am aware of! Why am I not detecting the nodes I pass over?
I discovered the answer to this. Essentially I was trying to detect nodesAtPoint on self, which in this case was the node being moved around the screen. Once I changed that to self.scene, the nodesAtPoint array populated as expected. So, to be clear:
println("nodes at point: \(self.nodesAtPoint(loc2))")
Needed to be changed to this:
println("nodes at point: \(self.scene.nodesAtPoint(loc2))")
If self is SKScene, try to change
let location = touch.locationInNode(self.parent)
to
let location = touch.locationInNode(self)
because SKScene's parent is nil