SKSpriteNode, added to/removed from parent hook

Question

Is there any (best practice) way within the class to hook the events when a SKSpriteNode (or SKNode) is added onto and removed from a parent node?

Answer 1

Without the need of Kobold Kit, you can sub-class a SKSpriteNode (or any SKNode for the fact) and extend the removeFromParent function that SKNodes own.

For example:

FLSprite.m:

#import "FLSprite.h"

@implementation FLSprite

-(void)removeFromParent {
    [super removeFromParent];
    NSLog(@"I print when I'm Removed");
    //here's where you'll add your hooking functions
}

@end

MyScene.m:

-(id)initWithSize:(CGSize)size {    
    if (self = [super initWithSize:size]) {
    FLSprite* sprite = [FLSprite spriteNodeWithColor:[UIColor blackColor] size:CGSizeMake(200, 100)];
        [sprite setPosition:CGPointMake(100.0, 50.0)];
        [self addChild:sprite];
        [sprite removeFromParent];

    }
    return self;
}

As for adding a child, since you add a child as such (in most cases) [self addChild:node]; you'll need to extend the addChild in the view you are adding to. For example you'll add the following to your MyScene.m, since we are adding the sprite to that view

-(void)addChild:(SKNode *)node {
    [super addChild:node];
    NSLog(@"added child");
}

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This is pretty much what Steffen Itterheim did to acheive this functions, as he explained in his posting.