NSData *thumbData = UIImageJPEGRepresentation(thumbnail, 0.5);

NSString *filePath = [[NSBundle mainBundle] pathForResource: @"gifFileName" ofType: @"gif"];

NSData *gifData = [NSData dataWithContentsOfFile: filePath];

NSString *pathForFile = [[NSBundle mainBundle] pathForResource: @"myGif" ofType: @"gif"];

NSData *dataOfGif = [NSData dataWithContentsOfFile: pathForFile];

NSLog(@"Data: %@", dataOfGif);

UIImage *image = ...;
NSData *data = [AnimatedGIFImageSerialization animatedGIFDataWithImage:image
                                                              duration:1.0
                                                             loopCount:1
                                                                 error:nil];

let path = Bundle.main.path(forResource: "loader", ofType: "gif")!
let data = try! Data(contentsOf: URL(fileURLWithPath: path))
return data