"_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.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)