I've done some searching but haven't found anything directly addressing my issue: I have an SKScene with several SKNodes each with SKSpriteNode objects for my game, and I am using a background UIImageView (there are some things I need to do with background that cannot be reasonable done with sprite kit - to my knowledge at least); the problem I'm having is that the UIImageView appears above everything and I can't see my game objects.
In my view controller (.m file) I have the following code to call my scene
#implementation GameViewController
- (void)viewDidLoad
{
[super viewDidLoad];
SKView * skView = (SKView *)self.view;
SKScene * scene = [GameScene sceneWithSize:skView.bounds.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
[skView presentScene:scene];
}
In the GameScene above, I have several SKNodes where all my game objects are children of (for example nodeHDU, nodePlay, nodePauseMenu...), and I am using a UIImageView as my background (I am switching between background scenes over time and am using some nice transitions such as UIViewAnimationOptionTransitionCrossDissolve; couldn't accomplish this with a SKSpriteNode as background without using multiple SKSpriteNodes and an intricate array of SKActions so I"m using UIImageView)
UIView *backgrounds = [[UIView alloc] init];
[self.view insertSubview:backgrounds belowSubview:self.view];
UIImageView *imageBackground = [[UIImageView alloc] initWithFrame:CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height)];
[backgrounds addSubview:imageBackground];
[backgrounds sendSubviewToBack:imageBackground];
[imageBackground setImage:[UIImage imageNamed:#"1-A.png"]];
imageBackground.alpha=1.0;
However, the ImageBackground above is the only thing I see when running the app in Xcode. The other objects from my game (children of other nodes) exist, and various NSLog statements are getting called, but they seem to appear behind the ImageBackground I have. The code above "belowSubview" and "sendSubviewToBack" don't help.
So How can I send the imageBackground to actually be the background?
Your problem is here that you are directly setting SKView as a controller view. To overcome from this issue don't make self.view a type of SKView. Do the following step in your storyboard or Xib :
Add an UIImageView on the controller's view first. Set the image as well.
Then add a SKView over the UIImageViewand set UIClearColor to the background colour.
So the complete hierarchy is like UIViewController->UIView->UIImageView->SKView
Related
I'm new to sprite kit game development and I was wondering if it's possible to add a particle emitter to a UIViewController. I want to have buttons on the screen along with the particle emitter for an app idea I have which is the problem. There is no built in button object for SKScene, so I decided maybe it would be better to add a particle emitter to a UIViewController class instead. Is it possible to make a particle emitter in the background and to place buttons on top of it that way?
Is there a specific reason you want to use SpriteKit for this? If you just want to integrate particle effects in a UIViewController, look into using a view and adding a CAEmitterLayer and CAEmitterCell.
They work great without using any of SpriteKit, and performance is good.
One of the good features about SpriteKit is the easiness of the implementation with UIKit:
Create a SKScene subclass:
//ParticleScene.h
#import <SpriteKit/SpriteKit.h>
#interface ParticleScene : SKScene
#property SKEmitterNode *emitter;
#end
//ParticleScene.m
#import "ParticleScene.h"
#implementation ParticleScene
-(instancetype)initWithSize:(CGSize)size{
if (self = [super initWithSize:size]) {
self.backgroundColor = [UIColor clearColor];
[self addEmitterNode];
}
return self;
}
-(void) addEmitterNode{
SKEmitterNode *emitter = [NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:#"SpriteKitParticleEmitter" ofType:#"sks"]];
emitter.position = CGPointMake(CGRectGetMidX(self.frame), self.frame.size.height);
[self addChild:emitter];
}
#end
Create SpriteKitParticleEmitter.sks
Top menu -> File / New / File... / (Resource) SpriteKit Particle File
Here you can modify the emitter as you want.
Add emitter to your UIViewController
You can add a UIView to your Storyboard and set it's subclass to SKView, or you can add the SKView programatically:
Add in -(void) viewDidLoad method:
SKView *spriteKitView = self.particleView; // Defined on storyboard
//Use SKView *spriteKitView = [[UIView alloc] initWithFrame:frame] to create it programatically and then [self.view addSubView:view];
spriteKitView.showsFPS = NO;
spriteKitView.showsNodeCount = NO;
spriteKitView.allowsTransparency = YES; //Prevents this view to show as a black square
spriteKitView.backgroundColor = [UIColor clearColor];
SKScene *scene = [JPParticleScene sceneWithSize:view.bounds.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
[view presentScene:scene];
If you use a Storyboard, just place self.spriteKitView behind your UIButtons.
I'm quite new to iOS development, and I'm working on an app that uses UIKit for buttons and Sprite Kit for a virtual joystick. My goal is to have the buttons and joystick visible on top of a UIImageView (more specifically, a MotionJpegImageView). I used a storyboard to create the buttons, and programatically created a UIImageView and added it as a subview to my main view in my view controller. The joystick was created in a separate file that subclasses SKScene. However, there's a problem. My UIImageView shows up below the buttons (as desired) but covers the joystick. I need the joystick to be visible on top of the image. I've already tried the sendSubviewToBack method but that isn't doing the trick. I've also tried using zPositions, but that is not working either. Does anyone know how I can achieve my goal? Relevant code is below. Thanks for looking!
ViewController.m
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
NSURL *url = [NSURL URLWithString:#"http://shibuya.ipcam.jp:60001/nphMotionJpeg?Resolution=320x240&Quality=Standard"];
_imageView = [[MotionJpegImageView alloc] initWithFrame:CGRectMake(self.view.frame.origin.y, self.view.frame.origin.x,
[[UIScreen mainScreen] bounds].size.height,[[UIScreen mainScreen] bounds].size.width)];
_imageView.url = url;
[self.view addSubview:_imageView];
[self.view sendSubviewToBack:_imageView];
[_imageView play];
SKView *spriteView = (SKView *) self.view;
JoystickScene* joystick = [[JoystickScene alloc] initWithSize:CGSizeMake(768,1024)];
[spriteView presentScene: joystick];
[self.view bringSubviewToFront:spriteView];
}
JoystickScene.m
- (void)didMoveToView: (SKView *) view
{
SKSpriteNode *jsThumb = [SKSpriteNode spriteNodeWithImageNamed:#"joystick.png"];
SKSpriteNode *jsBackdrop = [SKSpriteNode spriteNodeWithImageNamed:#"dpad.png"];
joystick = [Joystick joystickWithThumb:jsThumb andBackdrop:jsBackdrop];
joystick.position = CGPointMake(jsBackdrop.size.width, jsBackdrop.size.width);
velocityTick = [CADisplayLink displayLinkWithTarget:self selector:#selector(joystickMovement)];
[velocityTick addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
joystick.zPosition = 1;
[self addChild:joystick];
}
The spritekit SKView is the view of your viewcontroller. Every subview will be rendered on top of it. Is there a special reason you want to use Spritekit for the joystick? Otherwise I would suggest to make it with standard UIKit elements and just add it after the imageView.
Using an SKView on top of other views will not give you the desired results, since it cannot have a transparent background.
Another issue with your code: you shouldn't create and add views in viewWillLayoutSubviews, since this method could be called multiple times (every device Rotation for instance). Use viewDidLoad instead.
I made a game using sprite kit in landscape mode. The only allowed orientations are landscape left and landscape right. When I select the banner ad in my game, rather than freezing the scene and returning to the original point in the game, the entire scene reinitializes itself (music player restarts, content shows as start screen, etc).
The same thing happens when I flip the phone around so that the orientation switches. How can I prevent this?
As for when you flip your phone you need this...
- (void)viewWillLayoutSubviews {
[super viewWillLayoutSubviews];
SKView * skView = (SKView *)self.view;
if ( !skView.scene ) {...
SKScene * scene = [MenuScene sceneWithSize:skView.bounds.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
[skView presentScene:scene];
}
}
I'm still looking into the iAd issue, I'll update if I figure anything out.
Thanks for the response. That was the problem. I had been initializing the scene in the viewWillLayoutSubviews method in my root view controller. I moved the scene initialization to the viewDidLoad method and it fixed the issue.
I trying to create a game, and following Apple's advice I am using multiple scenes.
You could consider the game to be a text heavy point and click adventure.
Therein lies the problem. Lots of text, having done a bit of a search, it seems the recommend way, or rather the current only way to do this is with a UITextView thus:
[self.view addSubview: textView];
This is all well and good if you only have one SKScene, as that is the scene being displayed by the current view/SKView.
My problem is, that when I add the text to my scene's *view, which isn't the first scene the app loaded (its the third, or higher), the app jumps back to the first scene it loaded (which is my menu scene) and happily displays the required text.
Anybody got any idea why? I have menu scene transitioning to scene one, to scene two (in which I wish to display the test).
Please don't say I need a view per scene if I want to display more than a handful of words per scene, that just doesn't really make sense, but perhaps neither does my usage of SpriteKit.
I am still some what stunned there is no SK equivalent of the UITextView.
Anyway, any help, pointers would be great, thank you.
Ok, here are the relevant parts of the code.... I think.
Controller:
- (void)viewWillLayoutSubviews
{
[super viewWillLayoutSubviews];
// Configure the view.
SKView *skView = (SKView *)self.view;
skView.showsFPS = YES;
skView.showsNodeCount = YES;
skView.showsDrawCount = YES;
// Create and configure the scene.
SKScene *scene = [[GTMainMenu alloc] initWithSize:skView.bounds.size];
// Present the scene.
[skView presentScene:scene];
}
where GTMainMenu is a subclass of SKScene, and has a button (orange box) to an "act" (A subclass of GTScene, itself a subclass of SKScene), this will cause a transition to the act, which has another button to the first scene.
Only you never make it to the scene, as the viewDidLoad returns you to the main menu.
This is the viewDidLoad of the scene, which will cause it to "jump" back to the main menu:
- (void)didMoveToView:(SKView *)view
{
[super didMoveToView:view];
if (!self.contentCreated) {
[self createSceneContents];
self.contentCreated = YES;
}
UITextView *textView = [[UITextView alloc] initWithFrame:CGRectMake(self.size.width/2, self.size.height/2+20, 200, 40)];
textView.center = self.view.center;
textView.textColor = [UIColor blackColor];
textView.font = [UIFont systemFontOfSize:17.0];
textView.backgroundColor = [UIColor whiteColor];
textView.text = #"Where am I?";
[self.view addSubview:textView];
}
There is a git repo available here.
This is a striped down version of my project, removing everything that is unrelated to the issue at hand.
If you will excuse the code, my day job is Java, and I am struggling with certain concepts in Objective C at the moment.
Oh and sorry I managed to include the usersettings :S
Your view controller's viewWillLayoutSubviews method is not safeguarded against repeated execution. This method will not just run at app launch but every time the view rotates and resizes.
Add a check before creating/presenting a scene in that method:
if(self.view.scene == nil) { /* present scene */ }
Have you looked into SKLabelNode? I used it extensively in my SpriteKit game. If you need your SKLabelNode to do anything fancy (physics, etc.), you can just add it to a parent SKSpriteNode.
I need to add a rain particle effect to my app, I have been having a tough time finding ways to actually execute this idea.
I tried following this CALayer approach tutorial : Link but I am not quite sure if this is the best approach, considering the new iOS 7 SpriteKit Particle Emitter available in Xcode 5.
I have already created the .sks file and it's in my Hierarchy, but I am still unable to add it to my storyboard / project.
With that being said, How exactly do I add a SpriteKit Particle (sks) to my view? I am not at all familiar with scenes, layering , etc in the SpriteKit framework as I am not a game developer.
I need the most details and sample code possible so that I can figure this out please
UPDATE:
I have followed the direction provided in an answer by fellow SO member: AyatollahAndy, please see his answer below. Although I was able to display the SKScene in my view the app crashes when any touch event is received. I get the following:
Thanks
Create a SKScene in your UIView to add a SKEmitterNode particle effect.
One way of doing this:
1.In storyboard (or programatically if you prefer) add a View object on top of the existing View and resize it to your needs.
2.Change the class of the new view to SKView
3.In your view controller .h file create a property for the SKView:
#property IBOutlet SKView *skView;
4.Link the SKView on your storyboard to the skView property.
5.Create a new class, subclassing SKScene. MyScene.h will look like:
#import <SpriteKit/SpriteKit.h>
#interface MyScene : SKScene
#end
MyScene.m below contains code to create a particle effect whenever and wherever the SKView is touched.
#import "MyScene.h"
#implementation MyScene
-(id)initWithSize:(CGSize)size {
if (self = [super initWithSize:size]) {
/* Setup your scene here */
self.backgroundColor = [SKColor colorWithRed:0.15 green:0.15 blue:0.3 alpha:1.0];
SKLabelNode *myLabel = [SKLabelNode labelNodeWithFontNamed:#"Chalkduster"];
myLabel.text = #"Hello, World!";
myLabel.fontSize = 30;
myLabel.position = CGPointMake(CGRectGetMidX(self.frame),
CGRectGetMidY(self.frame));
[self addChild:myLabel];
}
return self;
}
//particle explosion - uses MyParticle.sks
- (SKEmitterNode *) newExplosion: (float)posX : (float) posy
{
SKEmitterNode *emitter = [NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:#"MyParticle" ofType:#"sks"]];
emitter.position = CGPointMake(posX,posy);
emitter.name = #"explosion";
emitter.targetNode = self.scene;
emitter.numParticlesToEmit = 1000;
emitter.zPosition=2.0;
return emitter;
}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
/* Called when a touch begins */
for (UITouch *touch in touches) {
CGPoint location = [touch locationInNode:self];
//add effect at touch location
[self addChild:[self newExplosion:location.x : location.y]];
}
}
-(void)update:(CFTimeInterval)currentTime {
/* Called before each frame is rendered */
}
#end
6.In your main view controller, include your scene class:
#import "MyScene.h"
and add code to viewDidLoad to initialise the SKView:
- (void)viewDidLoad
{
[super viewDidLoad];
// Configure the SKView
SKView * skView = _skView;
skView.showsFPS = YES;
skView.showsNodeCount = YES;
// Create and configure the scene.
SKScene * scene = [MyScene sceneWithSize:skView.bounds.size];
scene.scaleMode = SKSceneScaleModeAspectFill;
// Present the scene.
[skView presentScene:scene];
}
You should then have a working SKScene within your main UIView.
In modern Xcode:
This is now very easy.
1. In Xcode, click to create a new
"SpriteKit Particle File"
it will be a single .sks file.
(NOTE: Do NOT choose "SceneKit Particle System File". Choose "SpriteKit Particle File".)
Click once on the .sks file. Notice the many controls on the right.
The particles will actually be moving, it is a living preview. Anything that can be done with particles, you can do it. It is like using particles in a game engine, except performance is 18 billion times better.
2. Have any ordinary UIView, anywhere you want:
#IBOutlet weak var teste: UIView! // totally ordinary UIView
3. Just use the following code to link:
The following slab of code will put your new particle system, inside, the ordinary UIView "teste":
import SpriteKit ...
let sk: SKView = SKView()
sk.frame = teste.bounds
sk.backgroundColor = .clear
teste.addSubview(sk)
let scene: SKScene = SKScene(size: teste.bounds.size)
scene.scaleMode = .aspectFit
scene.backgroundColor = .clear
let en = SKEmitterNode(fileNamed: "SimpleSpark.sks")
en?.position = sk.center
scene.addChild(en!)
sk.presentScene(scene)
Add this to anything you want.
If you want a sparkling button, add it to a button.
If you want the whole screen to shower rainbows, add it to a full-screen view.
It's that easy.
Example of how to use the SpriteKit Particle File controls:
Say you want a burst of sparks, which ends.
Set the max to 50...
Tip - if your effect "finishes" (ie, it is not a loop), it seems you can simply get rid of the SKScene when finished. Like this:
...
scene.addChild(en!)
sk.presentScene(scene)
delay(1.5) { sk.removeFromSuperview() }
That one line of code at the end seems to clean-up everything.
BTW if you want fantastic ideas for particle systems, a great idea is click to the Unity "asset store", where various particle artists buy and sell particle systems. Their work will give you great ideas.
Just click "particles" in the list on the right; watch the videos. (Innovative examples .)
Note! Apple are going to make it so that you can very simply make a SKView in storyboard, and select the .sks scene. However ..
... it does not work yet! It's still broken as of the last edit to this post (2020). So you need the code fragment above.
You can add SKView as a subview within your UIKit hierarchy. A function like the following would work, allowing you to create a UIImageView with the effect as a subview, and then you can add this to your main view. Be sure to link against SpriteKit.
UIImageView *NewEffectUIImageViewWithFrame(CGRect frame)
{
UIImageView *tempView = [[UIImageView alloc] initWithFrame:frame];
SKView *skView = [[SKView alloc] initWithFrame:CGRectMake(0.0, 0.0, frame.size.width, frame.size.height)];
[tempView addSubview:skView];
SKScene *skScene = [SKScene sceneWithSize:skView.frame.size];
skScene.scaleMode = SKSceneScaleModeAspectFill;
skScene.backgroundColor = [UIColor clearColor];
SKEmitterNode *emitter = [NSKeyedUnarchiver unarchiveObjectWithFile:[[NSBundle mainBundle] pathForResource:#"SparkParticle" ofType:#"sks"]];
emitter.position = CGPointMake(frame.size.width*0.5,0.0);
[skScene addChild:emitter];
[skView presentScene:skScene];
return tempView;
}
In the end, if all you need is an emitter, it may be easier to create a CAEmitterLayer and add that as a sublayer to your UIView instead. Of course, that means you have to programmatically create the CAEmitterLayer and can't use the cool Xcode particle editor...
Here's approach totally different approach to try. My buddy gave me this cool way to go. Using CAEmitterCell. All in code! Looks like you need a spark.png image.
extension UIView {
final public func ignite() {
let emitter = CAEmitterLayer()
emitter.frame = self.bounds
emitter.renderMode = kCAEmitterLayerAdditive
emitter.emitterPosition = self.center
self.layer.addSublayer(emitter)
let cell = CAEmitterCell()
let bundle = Bundle.init(for: UIColor.self)
let image = UIImage(named: "spark", in: bundle, compatibleWith: traitCollection)
cell.contents = image?.cgImage
cell.birthRate = 1500
cell.lifetime = 5.0
cell.color = UIColor(red: 1.0, green: 0.5, blue: 0.1, alpha: 1).cgColor
cell.alphaSpeed = -0.4
cell.velocity = 50
cell.velocityRange = 250
cell.emissionRange = CGFloat.pi * 2.0
emitter.emitterCells = [cell]
}
}
Enjoy.
Actually there is a way to add particles without SpriteKit - CoreAnimation's CAEmitterCells.
This way you can add particles in your UIView easily. If you want to play around with the parameters and get the code easily, get this app (Particle X).
It also supports SpriteKit so if you want to play around or design particles on the go and immediately get the code for it, this app is the solution.
PS. If you haven't noticed it, I am the developer of the app - made it to use it myself when designing app and games. :)
Putting this here for visibility reasons.
The answers regarding the user of a .clear backgroundColor are correct, except that you must also set the allowsTransparency property on SKView to 'true'.
skView.allowsTransparency = true
skView.backgroundColor = .clear // (not nil)
scene.backgroundColor = .clear
If you don't set allowsTransparency to true, and you layout your SKView over, say, a UIImageView, the composition engine will have a fit, and will send your GPU red-lining, even if only a single particle is drawn. (In the Simulator, the CPU will spike instead.)
You cannot use particle effects within UIView directly.
SKEmitterNode must be in a node tree defined with a node scene (SKScene). The scene node runs an animation loop that renders the contents of the node tree for display. UIView is static, won't work for it.
However, you probably able to create a scene inside your UIView, but I've never tried to do that.