Encountering numerous leaks on iphone device when using NSOperationQueue and trying to change sliders / pickers etc?

I'm assuming you're doing something else before setSliders for which you created the NSOperation, and you just omitted that code.

You are releasing each label and slider in your for loop, even though you have not retained them. This is not correct. You only need to release memory that you have allocated, copied or retained.

See the memory management programming guide for more details.

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