I'm trying to make a space shooter. I'm DESPERATE of help so if anyone can help, let me know. The book doesn't address this issue (but if it does, it's hidden in the "Blocker" chapter, but I've spent hours staring at it and I can't figure it out)

So I have a space ship on the left. It shooting bullets rightward, but the bullet stops moving forward right when the next bullet is fired. So only one bullet moves at a time (and it would be the most recent bullet).

The way I programmed it, I used the screen refresh method to trigger it. On my view controller.m:

-(void) updateDisplay:(CADisplayLink *)sender
{

[fishFrames setFrame:gameModel.fishRect];
[bulletLv1 moveForward];
}

bulletLv1 is an instance of "bulletImageView" which is a subclass of UIImageView. and the "moveForward" method is defined as:

-(void) moveForward
{
self.center = CGPointMake(self.center.x +10, self.center.y);
}


My main issue is I don't know how to have multiple versions of the same object move independently. I'm guessing I might need to use MSMutable Arrays but I don't know. If anyone has any advice thanks...

OMG OMG OMG ! I fixed it!!!

I took a 5 hour break, and it just hit me. I was thinking of NES games, why the characters can shoot only 2 bullets, and I thought "maybe it's a memory allocation issue."

So I copied this critical line from Blocker and bracketed around the code that moved a bullet forward, and it fixed it.

"for (BlockView* bv in blockArray){"

I'm guessing the reason this worked is because originally I relied on one line of code to move all bullets. But it doesn't work like that. ten bullets needs ten actions. And 15 bullets need 15 actions. But by using this like, it "scans" the entire array to count how many bullets, and will perform as many actions as there are bullets.

Hi Gordio, this happens to me more often than I'd care to admit. I spend hours trying to fix something and come back to it at a later time or the next day and solve it in minutes. I'm sure it has something to do with getting a fresh look at the problem but I'm too stubborn sometimes to give up and take a break. ;)