Create an animated gif in swift

gif.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())
    }
}

Simon du är en GUD!!! Har suttit uppe flera nätter med ett gif-keyboard i Swift och kört med Cocoapods för att kunna copy:a en animerad UIImage som GIF. Det här var den enda funktionen som jag behövde pods till, men pods funkar inte bra när man använder app extensions, och den här lilla funktionen räddade mig! :)

@thyselius, åh! vad roligt att få hjälpa till! helt ärligt såg jag inte din kommentar förrän nu! hoppas allt löste sig helt och hållet till slut ☺️

I cannot get this to work...Once I have the data, I create a UIImage to use as the GIF, but it doesn't work, and the UIImage remains frozen on the first image.

@ChMaxou while UIImage supports GIFs UIImageView does not. I suggest you check out https://github.com/Flipboard/FLAnimatedImage for displaying GIFs in your app! I can also add that if you save the image to your camera roll, it will still be a GIF. If you send that image using any medium that supports GIFs, such as mail, it'll animate. Good luck!

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()

    })
    
}