下载

下载地址：
http://stevenygard.com/projects/class-dump
下载class-dump-3.5.dmg后双击打开

移动到/usr/bin下

这时你会发现不论是复制还是移动都不行，如下：

MacBook-Air:/ Mark$ sudo cp class-dump /usr/bin
Password:
cp: /usr/bin/class-dump: Operation not permitted
MacBook-Air:/ Mark$ sudo mv class-dump /usr/bin
mv: rename class-dump to /usr/bin/class-dump: Operation not permitted

解决方法如下：
1.重启mac
2.在启动时按下cmd+r直到出现苹果logo
3.这时有可能要你选择语言
4.选择工具(Utilities)打开终端(terminal)执行如下命令
csrutil disable
reboot
4.在次启动后重新执行移动命令～OK

更改权限

chmod 777 /usr/bin/class-bump

测试

执行class-bump

isoftstonedeMacBook-Pro:~ isoftstone$ cd /usr/bin/
isoftstonedeMacBook-Pro:bin isoftstone$ class-dump 
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, armv6, armv7, armv7s, arm64)
        -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)
isoftstonedeMacBook-Pro:bin isoftstone$ 

安装成功