How to add objects to CCArray from a different class with ARC - ios

Question

I needed to convert my code to ARC. I have an CCArray that I use to draw a path. I fill the objects of CCArray values from a different class.
Problem is after converting to ARC, CCArray returns always null
I can not see what I am doing wrong.
Ladybug.h
#interface Ladybug : CCSprite <CCTargetedTouchDelegate>{
CCArray *linePathPosition;
}
#property (nonatomic, strong) CCArray *linePathPosition;
#end
Ladybug.m
#synthesize linePathPosition;
-(id) init
{
if( (self=[super init] )) {
self.linePathPosition = [[CCArray alloc] init];
}
return self;
}
-(void) updatePosition:(CGPoint) position
{
[self.linePathPosition addObject:[NSValue valueWithCGPoint:position]];
NSLog(#"line path %#",linePathPosition);
}
-(void) breakMoveLadyBug
{
[self.linePathPosition removeAllObjects];
}
In main .m
- (void)ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
Ladybug *ladybug1 = (Ladybug *)[self getChildByTag:99];
CCMotionStreak* streak = (CCMotionStreak *)[self getChildByTag:999];
CGPoint touchLocation = [touch locationInView: [touch view]];
CGPoint curPosition = [[CCDirector sharedDirector] convertToGL:touchLocation];
if (ladybug1.isSelected) {
streak.position = curPosition;
[ladybug1 updatePosition:curPosition];
NSLog(#"Cur position %#",NSStringFromCGPoint(curPosition));
if (!ladybug1.isMoving) {
[ladybug1 startMoveLadyBug];
}
}
}
Log:
Cur position {331, 110}
line path (null)
What am I doing wrong? What is the proper way to define and init CCArray with ARC?

Answer 1

This isn't a problem with ARC or CCArray. The problem enlies in your understanding of objective-c.
To solve your problem, where ever you are doing this line [self addChild:ladybug1 z:999 tag:99]. Do this instead:
Ladybug *ladybug1 = [[Ladybug alloc] init];
[self addChild:ladybug1 z:0 tag:99];
Note: this is done outside of the ccTouchMoved function, in some function that adds the ladybug objects to the scene/layer.
Then your ccTouchMoved function will have an allocated ladybug object to work with.
The problem being that if you never call the init function on a ladybug object, the CCArray will never get allocated so everything will be null. You will then try to add points to an null array, and that will do nothing. You can do all this tag stuff you want (I personally have no idea why you are doing that), but you need to specify the tag for the ladybug object. So add it to the CCLayer/CCScene (w/e you are using), and set its tag. Then you can use the getChildByTag function.