Particles effect in iOS using core graphics
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First of all, I'm not an objective-c developer so please be gentle with me :)
Second, I've hired a developer to work on an iPhone & iPad application and as part of the application we would like to have a particles effect. 
After talking with the developer, it seems like he never implemented something like that and he's having bad time with it due to memory leaks so he told me he's unable to develop this feature.

My question is how do you implement particles effect by using CoreGraphics?
Please note that I've referred the developer to the following link, but he's told me it doesn't work well due to leaks:
http://www.clingmarks.com/generate-particles-along-a-path/822

I'll appreciate your help!

Best regards,

Nadav 