Giraffe是iPhoe的编码动画GIF文件，使用的GIF编码库是ANGif（UIImagePixelSource.m和ExportViewCotroller.m文件）
ANGif示例ANGifEcoder * ecoder = [[ANGifEcoder alloc] iitWithOutputFile:@"myFile.gif" size:CGSizeMake(100, 100) globalColorTable:il];[ecoder addApplicatioExtesio:[[ANGifNetscapeAppExtesio alloc] iit]];[ecoder addImageFrame:aImageFrame];[ecoder addImageFrame:aotherImageFrame];[ecoder closeFile];
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