"_inflateEnd", referenced from "_inflateInit_"等。这时需要在工程中加入libz.dlib 文件

Undefined symbols for architecture i386:  "_compressBound", referenced from:      +[NSDataGZipAdditions compressedDataWithBytes:length:] in NSDataGZipAdditions.o  "_compress", referenced from:      +[NSDataGZipAdditions compressedDataWithBytes:length:] in NSDataGZipAdditions.o  "_inflateInit_", referenced from:      +[NSDataGZipAdditions dataWithCompressedBytes:length:] in NSDataGZipAdditions.o  "_inflate", referenced from:      +[NSDataGZipAdditions dataWithCompressedBytes:length:] in NSDataGZipAdditions.o      -[ParserForMainReturn uncompressZippedData:] in ParserForMainReturn.o  "_inflateEnd", referenced from:      +[NSDataGZipAdditions dataWithCompressedBytes:length:] in NSDataGZipAdditions.o      -[ParserForMainReturn uncompressZippedData:] in ParserForMainReturn.o  "_inflateInit2_", referenced from:      -[ParserForMainReturn uncompressZippedData:] in ParserForMainReturn.old: symbol(s) not found for architecture i386clang: error: linker command failed with exit code 1 (use -v to see invocation)