以前没做过这个，第一次见，新奇
_sImg = [[UIImageView alloc] init];
NSString *filePath = [[NSBundle bundleWithPath:[[NSBundle mainBundle] bundlePath]] pathForResource:@"Packet" ofType:@"gif"];
NSData *imageData = [NSData dataWithContentsOfFile:filePath];
_sImg.image = [UIImage sd_imageWithGIFData:imageData];
