Giraffe是iPhone的编码动画GIF文件，使用的GIF编码库是ANGif（UIImagePixelSource.m和ExportViewController.m文件）
ANGif示例ANGifEncoder * encoder = [[ANGifEncoder alloc] initWithOutputFile:@"myFile.gif" size:CGSizeMake(100, 100) globalColorTable:nil];[encoder addApplicationExtension:[[ANGifNetscapeAppExtension alloc] init]];[encoder addImageFrame:anImageFrame];[encoder addImageFrame:anotherImageFrame];[encoder closeFile];
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