sprite-kit

I am quite confused with the spritekit coordinate system. I need clarification on two cases. Case 1: When a sprite node is added as child to the scene: SKSpriteNode * blueBall = [SKSpriteNode spriteNodeWithImageNamed:@"hRedBall.png"]; blueBall.name=@"blueball"; blueBall.size=CGSizeMake(75, 75); blueBall.position=point; //I am varying this point [self addChild:blueBall]; I have added the node at different points each time.These are the points I added the node at: (100x100)(200x200)(300x300)(400x400)(900,600) And in my iphone 5 device, they look like this: If you look into 100x100, when I add

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touch"); ... } I have a really simple problem that I can't find any answers to. Most of the time, when I tap the screen, the nslog executes immediately. However, about 1 in 5 times, there is a half second pause before the message displays. I'm making a game and I need the touchesbegan to execute immediately. Can anyone tell me what I'm doing wrong? BTW, the framerate is a mostly constant 60 fps. 来源： https://stackoverflow.com/questions/23047732/sprite-kit-touchesbegan-delay-lag

I am attempting to learn swift by refactoring one of my old games and I need to rewrite my update method which calculates a delta time. This code works but is ugly. How would I go about properly rewriting this? import SpriteKit class GameScene: SKScene { var lastUpdateTimeInterval: CFTimeInterval? override func update(currentTime: CFTimeInterval) { var delta: CFTimeInterval? if let luti = lastUpdateTimeInterval { delta = currentTime - luti } else { delta = currentTime } lastUpdateTimeInterval = currentTime; if (delta > 1.0) { delta = minTimeInterval; lastUpdateTimeInterval = currentTime; }

I am trying to build a simple obstacle jumping app. I want the image for the obstacle to be picked randomly from a set of images. I have tried using a combination of the arc4random_uniform function and switch case but that doesn't seem to update the SKSpriteNode. What am i doing wrong? class PlayScene: SKScene, SKPhysicsContactDelegate{ ... var block3 = SKSpriteNode(imageNamed: "lion") .... } override func update(currentTime: NSTimeInterval) { ..... blockRunner() } func blockRunner() { var imageNamedAnimal = "" var randomIndex = arc4random_uniform(2) switch(randomIndex) { case 0 :

Okay, I have a scene in which I have this method, createSceneContents , that gets called when didMoveToView gets called. In this method I have a couple of things that create the scenes, including a timer that spawns nodes like this: self.spawningSpeed = 1.5; self.enemyData = [[Enemy alloc]init]; SKAction *wait = [SKAction waitForDuration:1.5]; SKAction *run = [SKAction performSelector:@selector(spawningEnemy) onTarget:self]; self.spawnAction = [SKAction repeatActionForever:[SKAction sequence:@[wait,run]]]; [self.world runAction:self.spawnAction withKey:@"spawn"]; enemyData is an object of my

Is there possible to get current image name from SKTexture from SKSpriteNode? I am a new in SpriteKit and I'm writing a little game. I need to detect when ninja will hit enemy. Something like this I am doing SKAction like - (void)setUpHit { SKTextureAtlas *hitAtlas = [SKTextureAtlas atlasNamed:@"Ninja_hit"]; SKTexture *hit1 = [hitAtlas textureNamed:@"Ninja_hit_1"]; SKTexture *hit2 = [hitAtlas textureNamed:@"Ninja_hit_2"]; SKTexture *hit3 = [hitAtlas textureNamed:@"Ninja_hit_3"]; SKTexture *hit4 = [hitAtlas textureNamed:@"Ninja_hit_4"]; SKAction *hitAnimation = [SKAction animateWithTextures:@