62 lines
1.9 KiB
Markdown
62 lines
1.9 KiB
Markdown
<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).
|
|
|
|
#### 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
|
|
frames).
|
|
|
|
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):
|
|
|
|
```swift
|
|
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.
|
|
|
|
Nice-to-haves:
|
|
|
|
- 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
|
|
|
|
See LICENSE.
|