Hi all,
there is a strange behavior of twitter, while trying to post gif animation to twitter, created by iOS application:
all preview at browsers and mail play the animation the proper way, however, after I post it to twitter (both from browser and iOS device) it shows several frames at once, shifts some frames respectively one another etc
what can cause this strange behavior ?
I create this gif animation by the following code:
func createGIF(with images: [UIImage], loopCount: Int = 0, frameDelay: Double) {
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) {
let data = NSData(contentsOfURL: url)
//println("success \(url)")
let library = ALAssetsLibrary()
library.writeImageDataToSavedPhotosAlbum(data, metadata: nil, completionBlock:{
(assetURL: NSURL!, error: NSError!) -> Void in
})
}
else {
}
}
}
it seems, there are some special requirements for gif animation, for their proper transformation to video by twitter
The preview at twitter (small square area, where I can preview the animation) plays the animation correctly.
PS I wasn’t sure what category is that
