使用class-dump工具反编译Objective-C

class-dump是一款非常好用的Objective-C反编译分析工具，它可以从Objective-C编译生成的二进制文件中将类定义以Objective-C头文件的方式提取出来。

class-dump是一款开源工具，官网地址是：http://stevenygard.com/projects/class-dump/

使用参数为：

class-dump 3.5 (64 bit)
Usage: class-dump [options] <mach-o-file>

  where options are:
        -a             show instance variable offsets
        -A             show implementation addresses
        --arch <arch>  choose a specific architecture from a universal binary (ppc, ppc64, i386, x86_64)
        -C <regex>     only display classes matching regular expression
        -f <str>       find string in method name
        -H             generate header files in current directory, or directory specified with -o
        -I             sort classes, categories, and protocols by inheritance (overrides -s)
        -o <dir>       output directory used for -H
        -r             recursively expand frameworks and fixed VM shared libraries
        -s             sort classes and categories by name
        -S             sort methods by name
        -t             suppress header in output, for testing
        --list-arches  list the arches in the file, then exit
        --sdk-ios      specify iOS SDK version (will look in /Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS<version>.sdk
        --sdk-mac      specify Mac OS X version (will look in /Developer/SDKs/MacOSX<version>.sdk
        --sdk-root     specify the full SDK root path (or use --sdk-ios/--sdk-mac for a shortcut)

使用举例：加入在class-dump工具在当前目录下，要分析的文件为myApp.app，也在当前目录下，要将导出的头文件放在当前目录下的ExportHeader目录内，则命令为./class-dump -H myApp.app -o ./ExportHeader