http://stevenygard.com/projects/class-dump/
1. First, create a new bin directory under the current user. In the terminal
mkdir ~/bin
2. Open the dmg of the downloaded class dump, copy all the files in it to the bin directory created, and give it executable permissions
chmod +x ~/bin/class-dump
3. Open the Bash? Profile file to configure the environment variable and add: export PATH=HOME/bin/:PATH on the last line
vim ~/.bash_profile
4. After adding, execute
source ~/.bash_profile
5. Test success
zhen:~ zhenxb$ 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)
6. Class dump use
Change the ipa file packed by yourself, change the suffix to. zip, and extract it