Error.. Kills app.

[Kenrik]

Ok so I have a time animated bad guy & a missile that shoots at him.

I use this for collision detection..

if (CGRectContainsRect([myBub1 frame], [missile frame]))
	{
	[myBub1 removeFromSuperview];
	[bubMoveTimer1 invalidate];
	[missileTimer invalidate];
	missile.center = bubView.center;
	missileButtonPressed = NO;
	missile.hidden = YES;
	}

it removes my bad guy, invalidates the movement timers and moves the missile back to my good guy to be fired again.

well that all works perfect but my problem is that when I fire again at the same spot that I killed the last bad guy the missile hits something at the same spot that the bad guy was at and it crashes my app..

It's like my badguy leaves behind his frame when I remove him from the superview & when it goes to remove him again it kills the app (because he's already been removed)

Any ideas??

[Kenrik]

You know what? I think it's because when I invalidate the movement timer my frame still has it's movement code that gets paused so it removes the image but leaves the frame because it's still stuck in limbo..

that's my theory.. I mean I can't actually see what's happening.


is it possible to make the frames visible? it would help with debugging.

Any ideas? how can I get those frames out of limbo? is there any kind of "SUPER REMOVE" command?

[Kenrik]

bumpity....

[Pring]

Trying setting the timer to 'nil' after invalidating it.

[Kenrik]

From Apple Docs..

"Discussion
This is the only way to remove a timer from an NSRunLoop object. The NSRunLoop object removes and releases the timer, either just before the invalidate method returns or at some later point.

You must send this message from the thread on which the timer was installed. If you send this message from another thread, the input source associated with the timer may not be removed from its run loop, which could prevent the thread from exiting properly.

The receiver releases its references to the target and userInfo objects at the point of invalidation."

That sucks! because I'm sending the Invalidate command from another thread it's not killing it properly.

Any ideas of how to send a message from my one thread to the other that triggers it.. ?

maybe a BOOL switch with a "if BOOL = YES" [invalidate] type thing?

[PhoneyDeveloper]

performSelectorOnMainThread:
performSelector:onThread:

[Kenrik]

Mega Woot!

That works perfect.. no more crashes!

So for future reference (anyone who searches and finds this thread)

"YOU MUST INVALIDATE A TIMER FROM WITHIN IT'S OWN THREAD"

otherwise it will leave part of the code in limbo indefinitely.