Bonbons falling continuously from random positions - ios

Question

I have got the following problem in SpriteKit: My aim is to let bonbons fall continuously from the top of the screen. These bonbons can be collected by the player. Every 0.8 seconds or so, another bonbon should fall down and when the player collides with one of the bonbons, it should disappear. This is my code:
-(void)populate {
for (int i = 0; i < 2; i++) {
[self generate];
}
}
-(void)generate {
Y = (arc4random() % 280) - 140;
bonbon = [SKSpriteNode spriteNodeWithImageNamed:#"Bonbon.png"];
bonbon.size = CGSizeMake(20, 20);
bonbon.name = #"bonbon";
bonbon.physicsBody.categoryBitMask = bonbonCategory;
bonbon.position = CGPointMake(Y, 500);
bonbon.physicsBody = [SKPhysicsBody bodyWithCircleOfRadius:bonbon.size.width/2];
bonbon.physicsBody.dynamic = YES;
[bonbon addChild:bonbon];
}
-(void)didBeginContact:(SKPhysicsContact *)contact
{
if ([contact.bodyA.node.name isEqualToString: #"wallLeft"] || [contact.bodyB.node.name isEqualToString: #"wallLeft"])
{
[hero.physicsBody applyImpulse: CGVectorMake(100, 60)];
self.jumpDirection = YES;
}
else if ([contact.bodyA.node.name isEqualToString: #"bonbon"] || [contact.bodyB.node.name isEqualToString: #"bonbon"])
{
[world enumerateChildNodesWithName:#"bonbon" usingBlock:^(SKNode *node, BOOL *stop) {
PointsLabel *pointsLabel = (PointsLabel *)[self childNodeWithName:#"pointsLabel"];
[pointsLabel increment];
NSLog(#"didContactBonbon");
[bonbon removeFromParent];
NSLog(#"removedFromParent");
}];
}
else {
[hero.physicsBody applyImpulse: CGVectorMake(-100, 60)];
self.jumpDirection = NO;
}
}
I hope you understand my problem. Currently, no bonbons are falling at all. If you need more information, please do not hesitate to ask.
Greets
edit: I hope the formatting is better now. I am quite a newbie, i'm sorry for foolish mistakes :) This is in my MyScene.m, when is call the populate in the initWithSize method with [self populate]; I receive the message signal SIGABRT. What did I do wrong?

Answer 1

I think the problem is that you are adding your SKSpriteNode named bonbon to itself with :
- (void)generate {
...
bonbon = [SKSpriteNode spriteNodeWithImageNamed:#"Bonbon.png"];
...
[bonbon addChild:bonbon];
}
Try to add bonbon to your SKScene instance.
To use an SKView instance you have to create a UIViewController and give its view the SKView class. You can do that in your storyboard.
Then, in your viewController :
#implementation GameViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Configure the view.
SKView * skView = (SKView *)self.view;
// Configure the scene
SKScene *scene = [SKScene sceneWithSize:self.view.bounds.size];
// You can add objects to your scene
[scene addChild:bonbon];
// Present the scene.
[skView presentScene:scene];
}
#end
This is a very simple example but if you want more information, I suggest you read this tutorial: Sprite Kit Tutorial for Beginners.