Chisel is a collection of LLDB commands to assist debugging iOS apps.
在我查阅如何定位视图约束冲突相关博客资料的时候，了解到了Facebook开源的这款LLDB调试工具，通过Chisel可以轻松的找到约束有冲突的视图，自己以前只接触过Xcode自带LLDB工具，用的也不算太多，通过阅读相关文档，发现Chisel有很多实用的功能，比如说打印视图层级关系，通过命令添加断点，打印对象继承关系，预览打开UIImage、CGImageRef图片，显示隐藏视图或layer等等。
目录
- GitHub地址
- 安装
- 常用常用Commands
- 推荐博客
一、GitHub地址
二、安装
- 未安装Homrebrew，先安装Homrebrew
参考MAC上Homebrew常用命令 - 安装Chisel
brew install chisel
- 如果没有创建.lldbinit文件，则在终端创建文件
touch .lldbinit
//open .lldbinit
- 编辑.lldbinit文件，并添加以下内容
command script import /usr/local/opt/chisel/libexec/fblldb.py
vim .lldbinit
//添加以下内容
# ~/.lldbinit
...
command script import /path/to/fblldb.py
最后wq保存，重启Xcode，就可以使用Chisel了。
三、常用Commands
| 命令 | 命令描述 | iOS | OS X |
|---|---|---|---|
| pviews | Print the recursive view description for the key window. | YES | YES |
| pvc | Print the recursive view controller description for the key window. | YES | NO |
| visualize | Open a UIImage, CGImageRef, UIView, CALayer, NSData (of an image), UIColor, CIColor, or CGColorRef in Preview.app on your Mac. | YES | NO |
| fv | Find a view in the hierarchy whose class name matches the provided regex. | YES | NO |
| fvc | Find a view controller in the hierarchy whose class name matches the provided regex. | YES | NO |
| show/hide | Show or hide the given view or layer. You don't even have to continue the process to see the changes! | YES | YES |
| mask/unmask | Overlay a view or layer with a transparent rectangle to visualize where it is. | YES | NO |
| border/unborder | Add a border to a view or layer to visualize where it is. | YES | YES |
| caflush | Flush the render server (equivalent to a "repaint" if no animations are in-flight). | YES | YES |
| bmessage | Set a symbolic breakpoint on the method of a class or the method of an instance without worrying which class in the hierarchy actually implements the method. | YES | YES |
| wivar | Set a watchpoint on an instance variable of an object. | YES | YES |
| presponder | Print the responder chain starting from the given object. | YES | YES |
| ... | ... | ... | ... |
就介绍这么多了，现在自己用到的也并不算太多，做下记录，方便自己以后查阅，有兴趣的朋友可以自行了解其用法吧。
推荐博客
1、LLdb篇2教你使用faceBook的chisel来提高调试效率
2、Chisel-LLDB命令插件，让调试更Easy
