I'm trying to make a simple game where, when the player's tank changes direction (north, south, east, or west) the tank swaps the old child image for a new one. I found swapChild, which seems like it would do exactly what I want, but the display isn't updating accordingly. However, if I actually removeChild the old image, and addChild the new one, it works.
My code is here, if it helps: http://github.com/nathankoch/TankTank/blob/master/src/Classes/Tank.m (check out method newFacing - line 79)
Hi Nathan!
The name of the "swapChildren"-function is a little misleading here. Actually, swapChild swaps the indexes of 2 objects that are *both* already children of the container. It's useful if you want one object to appear in front of another one, or move it behind.
So, for what you want to achieve, calling removeChild and addChild is exactly what you need to do.
However, that reminds me that I should finally add a proper API documentation 
Best regards,
Daniel
How about adding a "replaceChild: withChild:" method to maintain the index of the child? (like NSMutableArray's replaceObjectAtIndex:withObject:)
Perhaps there's another way to do this -- but I'm trying to change the PNG for an SPImage that is behind some other images, and I found that if I just change the image nothing happens; if I change the image and then use addChild it's on top, so I'll try addChildAtIndex and removeChild.
Hm, not a bad idea, I'll think about it!
For now, you could do it like this:
// replace 'child' with 'newChild' int oldIndex = [sprite indexOfChild:child]; [child removeFromParent]; [sprite addChild:newChild atIndex:oldIndex];
Hi nathan, about the API docs the user tristan made something very usefull in this post:
http://forum.sparrow-framework.org/topic/doxygen#post-1173
I use it quite a lot ^^'
EDIT: lol, i answered an 8 months old questions... sorry! Better later than never? ^^'
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