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Article Written By:
Johann Dowa

iOS Library Providing An NSTimer Replacement That Supports GCD Queues

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NSTimer provides an easy to use timer API, but issues arise when working with GCD.

Here’s an NSTimer replacement from Javier Soto of Mindsnacks that provides a nice simple syntax like NSTimer but doesn’t retain the target, and can be used by GCD queues thus removing the need for you to work directly with dispatch_source when you need timers for a GCD thread.

As the readme states:

The first motivation for this class was to have a type of timer that objects could own and retain, without this creating a retain cycle ( like NSTimer causes, since it retains its target ). This way you can just release the timer in the -dealloc method of the object class that owns the timer.

and..

More often than not, an object needs to create a timer and invalidate it when a certain event occurs. However, doing this when that object works with a private GCD queue gets tricky. This timer object is thread safe and doesn’t have the notion of run loop, so it can be used with GCD queues and installed / invalidated from any thread or queue.

You can find NSWeakTimer on Github here.

A nice easy timer class that works with GCD.


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