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Reda Lemeden 2014-09-07 23:45:51 +02:00
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# Gifu
<img src="https://dl.dropboxusercontent.com/u/148921/logo.svg" width="100" />
Adds animated GIF support to UIKit. For the Japanese prefecture, click [here](https://goo.gl/maps/CCeAc).
Adds animated GIF support to UIImageView.
#### Why?
Because Apple's `+animatedImage*` sucks, and the few third party implementations that
got it right (see [Credits](#credits)) still require you to use a `UIImageView` subclass.
#### How?
Gifu is a `UIImage` subclass and `UIImageView` extension written in Swift.
It uses `CADisplayLink` to animate the view and only keeps a limited number of
frames in-memory, which exponentially minimizes memory usage for large GIF files (+300
The figure below summarizes how this works in practice. Given an image
containing 10 frames, Gifu will load the current frame (red), pre-load the next two frames (orange),
and nullify all the other frames to free up memory (gray):
<img src="https://dl.dropboxusercontent.com/u/148921/figure.gif" width="300" />
#### Usage
Use git submodules or drag-and-drop the files in your Xcode project. I can't
believe I'm saying this in 2014.
Once done, you can call `setAnimatableImage(named:)` or
`setAnimatableImage(data:)` on your `UIImageView` (or its subclass):
let imageView = UIImageView(...)
imageView.setAnimatableImage(named: "computer-kid.gif")
// or
imageView.setAnimatableImage(data: NSData(...))
#### To-do
The usual suspects:
- Add documentation.
- Write some basic tests.
- Use Reactive Cocoa instead of (sloppy) delegation.
- Remove side effects from the private functions.
#### Credits
- The animation technique described above was originally spotted on
[OLImageView](https://github.com/ondalabs/OLImageView), then improved in [YLGIFImage](https://github.com/liyong03/YLGIFImage).
- The font used in the logo is [Azuki](http://www.myfonts.com/fonts/bluevinyl/azuki/)
- Kudos to my colleague [Tony DiPasquale](https://github.com/tonyd256) for helping out with the factory methods.
#### License

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