An animated GIF engine for iOS in Swift with low memory & cpu usage.

##Features

• Optimized for Multi-Image case.[New]
• As UIImage and UIImageView extension,easy to use.
• Have a great performance on memory usage by using producer/consumer pattern.
• Have a great performance on CPU usage by using asynchronous loading.
• Allow to control display quality by using factor 'level of Integrity'
• Allow to control memory usage by using factor 'memoryLimit'

##Installation ######With CocoaPods

source 'https://github.com/CocoaPods/Specs.git'
use_frameworks!
pod 'JWAnimatedImage'

######With Carthage

github "wangjwchn/JWAnimatedImage"

##How to Use

let url = NSBundle.mainBundle().URLForResource(“imagename”, withExtension: "gif")!
let imageData = NSData(contentsOfURL:url)
let image = UIImage()
image.AddGifFromData(imageData!)
let gifmanager = JWAnimationManager(memoryLimit:20)
let imageview = UIImageView()
imageview.AddGifImage(image,manager:gifmanager)
imageview.frame = CGRect(x: 0.0, y: 5.0, width: 400.0, height: 200.0)
view.addSubview(imageview)

##Architecture

####UIImageView State:

##Benchmark:Compared with FLAnimatedImage ###1.Display 1 Image

	CPU Usage[average]	Memory Usage[average]/MB
JWAnimatedImage	6% ~ 14% [8%]	7.5 ~ 8.4 [8.2]
FLAnimatedImage	8% ~ 24% [11%]	7.3 ~ ??? [???]

###2.Display 3 Images

	CPU Usage[average]	Memory Usage[average]/MB
JWAnimatedImage	31% ~ 44% [38%]	12.4 ~ 13.4 [12.9]
FLAnimatedImage	36% ~ 62% [54%]	11.0 ~ 12.4 [11.3]

###3.Display 30 Images

	CPU Usage[average]	Memory Usage[average]/MB
JWAnimatedImage	38% ~ 81% [53%]	59.3 ~ 82.4 [63.3]
FLAnimatedImage	126% ~ 185% [143%]	58.4 ~ 98.9 [74.2]

NOTE:

1.Measurement Factors:

• Last updated: March 26, 2016

• Measurement device: iPhone6 with iOS 9.3

• Measurement tool: Profile in Xcode 7.3

• Measurement image: See it in repository, all the parameters are default.

• Raw data are here.

2.I've discussed the high memory usage of FLAnimatedImage with @mitchellporter and confirmed this problem does exist，as described here.

3.For each image, FLAnimatedImage creates a new independent thread. From the graph, we can see there are 36 threads when loading 30 GIFs, which causes a heavy CPU usage.

##Licence JWAnimatedImage is released under the MIT license. See LICENSE for details.