The following guide shows an example about how to load animated GIF by UIImageView for users who want to display GIF ads.
Loading data from Customized In-Feed advertisement parameters’s property’,can identify data is GIF if
mimeType from response data is image/gif.
URLSession.shared.dataTask(with: URLRequest(url: instreamInfoModel.imageURL!)) { (data, response, error) in
guard let data = data, let response = response as? HTTPURLResponse, error == nil else {
return
}
DispatchQueue.main.async(execute: {
if (response.mimeType == "image/gif") {
//this is a gif image
} else {
}
})
}.resume()
Refering to Image I/0 framework,get imageSource from data and use animationImages to play GIF。
The following guide shows an example.
//add imageView as a subView and call imageView's startAnimating() method
guard let imageView = self.createGifImageFromData(data: data as NSData, bounds: yourView.containerView.bounds) else {return}
yourView.containerView.addSubview(imageView)
imageView.startAnimating()
func createGifImageFromData (data : NSData, bounds : CGRect) -> UIImageView? {
guard let gifImagesSource = CGImageSourceCreateWithData(data as CFData, nil) else {return nil}
//gif image's count
let gifImagesCount = CGImageSourceGetCount(gifImagesSource)
var gifImagesArray = [UIImage]()
var totalDuration : TimeInterval = 0
let imageView = UIImageView(frame: bounds)
for i in 0 ..< gifImagesCount {
guard let cgImage = CGImageSourceCreateImageAtIndex(gifImagesSource, i, nil) else { continue }
let image = UIImage(cgImage: cgImage)
if i == 0 {
imageView.image = image
}
gifImagesArray.append(image)
// Frame default duration
var frameDuration : Float = 0.1;
guard let properties = CGImageSourceCopyPropertiesAtIndex(gifImagesSource, i, nil) else {
totalDuration += frameDuration
continue }
guard let gifDict = (properties as NSDictionary)[kCGImagePropertyGIFDictionary] as? NSDictionary else {
totalDuration += frameDuration
continue }
if let delayTimeUnclampedProp = gifDict[kCGImagePropertyGIFUnclampedDelayTime as String] as? NSNumber {
frameDuration = delayTimeUnclampedProp.floatValue
} else {
if let delayTimeProp = gifDict[kCGImagePropertyGIFDelayTime as String] as? NSNumber {
frameDuration = delayTimeProp.floatValue
}
}
// Make sure its not too small
if frameDuration < 0.01 {
frameDuration = 0.1;
}
totalDuration += frameDuration
}
imageView.animationImages = gifImagesArray
// Each frame has same delay time
imageView.animationDuration = TimeInterval(totalDuration)
// Loop gif
imageView.animationRepeatCount = 0
imageView.contentMode = .scaleAspectFit
imageView.image = UIImage(data: data as Data)
return imageView
}
}