Chisel是facebook开源的辅助xcode进行iOS开发调试的工具，包含一系列更加有用的lldb命令，而且Chisel还支持添加本地以及自定义命令。本文从工具介绍开始，带大家认识并使用这一强大工具。
Chisel 简介
安装
直接按照官方文档进行：
- 安装Homebrew
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
- 安装Chisel
brew update
brew install chisel
-
更新.lldbinit
.lldbinit文件是lldb启动之前加载的文件，用于lldb的初始化，每次lldb启动都会加载。安装chisel成功之后，终端会打印如下提示，按照提示，将启动chisel的命令复制到.lldbinit文件中。
chisel安装.png
我是通过如下命令直接将上面的命令写入文件中(>>表示追加到文件尾，如果你已经添加过则无需再次添加)
echo command script import /usr/local/opt/chisel/libexec/fblldb.py >> ~/.lldbinit
-
重启xcode并check
check方法有两种，第一种是打开终端依次输入：llbd<enter>,help<enter>；第二种方法是打开xcode，打断点并执行到断点处，输入help命令。滚动help的结果，当找到Current user-defined commands:一行，即表示安装成功。
chisel安装check.png
Chisel常用命令简介
pmethods
print the class and instance methods of a class.pclass
Print the inheritance starting from an instance of any class.poobjc
Print the expression result, with the expression run in an ObjC++ context. (Shortcut for "expression -O -l ObjC++ -- " ).pviews
Print the recursion description of <aView>.pcells
Print the visible cells of the highest table view in the hierarchy.pblock
Print the block`s implementation address and signature.mask
Add a transparent rectangle to the window to reveal a possibly obscured or hidden view or layer's boundsborder
Draws a border around <viewOrLayer>. Color and width can be optionally provided. Additionally depth can be provided in order to recursively border subviews.show
Show a view or layer.
添加本地及自定义命令
参考官方文档，这里整理出基本步骤如下：
- 开发命令脚本
官方文档提供了一个example（源码贴在下面方便大家阅读） - 更新.lldbinit
同Chisel安装完成后的步骤一样，需要将初始化的命令同步到.lldbinit文件中。 - check命令
同check Chisel是否安装成功的方法一样。
#!/usr/bin/python
# Example file with custom commands, located at /magical/commands/example.py
import lldb
import fblldbbase as fb
def lldbcommands():
return [ PrintKeyWindowLevel() ]
class PrintKeyWindowLevel(fb.FBCommand):
def name(self):
return 'pkeywinlevel'
def description(self):
return 'An incredibly contrived command that prints the window level of the key window.'
def run(self, arguments, options):
# It's a good habit to explicitly cast the type of all return
# values and arguments. LLDB can't always find them on its own.
lldb.debugger.HandleCommand('p (CGFloat)[(id)[(id)[UIApplication sharedApplication] keyWindow] windowLevel]')
最后，Enjoy yourself！
