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@westerlund
Created December 22, 2014 17:07
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Create an animated gif in swift
func createGIF(with images: [UIImage], loopCount: Int = 0, frameDelay: Double, callback: (data: NSData?, error: NSError?) -> ()) {
let fileProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: loopCount]]
let frameProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFDelayTime as String: frameDelay]]
let documentsDirectory = NSTemporaryDirectory()
let url = NSURL(fileURLWithPath: documentsDirectory)?.URLByAppendingPathComponent("animated.gif")
if let url = url {
let destination = CGImageDestinationCreateWithURL(url, kUTTypeGIF, UInt(images.count), nil)
CGImageDestinationSetProperties(destination, fileProperties)
for i in 0..<images.count {
CGImageDestinationAddImage(destination, images[i].CGImage, frameProperties)
}
if CGImageDestinationFinalize(destination) {
callback(data: NSData(contentsOfURL: url), error: nil)
} else {
callback(data: nil, error: NSError())
}
} else {
callback(data: nil, error: NSError())
}
}
@Rotemy
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Rotemy commented Jul 15, 2018

Swift 4.2 (with rx)

private func createPreviewGIF(with images: [UIImage], loopCount: Int = 0, frameDelay: Double) -> Observable<URL?> {
    
    return Observable.create({ subscriber in

        let fileProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFLoopCount as String: loopCount]] as CFDictionary
        let frameProperties = [kCGImagePropertyGIFDictionary as String: [kCGImagePropertyGIFDelayTime as String: frameDelay]] as CFDictionary
        
        let documentsDirectory = NSTemporaryDirectory()
        let url = NSURL(fileURLWithPath: documentsDirectory).appendingPathComponent("\(Utils.randomString(length: 8)).gif")
        
        if let url = url, let destination = CGImageDestinationCreateWithURL(url as CFURL, kUTTypeGIF, images.count, nil) {
            
            CGImageDestinationSetProperties(destination, fileProperties)
            
            for i in 0..<images.count {
                
                if let cgImage = images[i].cgImage {
                    CGImageDestinationAddImage(destination, cgImage, frameProperties)
                }
                
            }
            
            if CGImageDestinationFinalize(destination) {
                
                subscriber.onNext(url)
                
            } else {
                
                subscriber.onNext(nil)

            }
            
        } else  {
         
            subscriber.onNext(nil)

        }
        
        subscriber.onCompleted()
        
        return Disposables.create()

    })
    
}

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