1.什么是LLDB
LLDB是英文Low Lever Debug的缩写，是XCode内置的为我们开发者提供的调试工具；方便开发者对开发问题进行快速有效的解决；
2.LLDB 断点设置
新建一个Object-C工程，写了下方代码，给一个 OC 方法下断点，运行工程，就可以进入LLDB调试环境
1、使用LLDB中“breakpoint set -n 函数名 ”下断点
1.在lldb 中输入给demo1方法下断点
breakpoint set -n demo1
输出：
Breakpoint 2: where = LLDB调试`-[ViewController demo1] at ViewController.m:27, address = 0x000000010d8e1be0
表示断点下入成功
其中：
Breakpoint 2: 表示这是全局的第二个断点
where = LLDB调试`-[ViewController demo1] at ViewController.m:27,：标示断点位置和方法名称
address = 0x000000010d8e1be0：断点所表示的内存地址
2.给函数下断点
breakpoint set -n "[ViewController douYinClick:]"
Breakpoint 3: where = LLDB调试`-[ViewController douYinClick:] at ViewController.m:34, address = 0x000000010d8e1c10
2、breakpoint set -l 行数 -f 文件名
输入：
breakpoint set -l 23 -f ViewController.m
输出：
Breakpoint 4: where = LLDB调试`-[ViewController touchesBegan:withEvent:] + 77 at ViewController.m:23:5, address = 0x000000010d8e1b8d
3.使用breakpoint set -a 16位的物理地址
这里我们首先找到16为物理地址，xcode工具栏Debug ->Debug WorkFlow -> Alawys Show Disassembly进入栈调试找到物理地址0x10d8e1b97；
输入：
breakpoint set -a 0x10d8e1b97
输出：
Breakpoint 5: where = LLDB调试`-[ViewController touchesBegan:withEvent:] + 87 at ViewController.m:24:6, address = 0x000000010d8e1b97
4、使用函数全部名称设置断点
breakpoint set -F 函数全名
输入：
breakpoint set -F kuaiShouClick:5.使用函数局部名称进行设置断点
输入：
breakpoint set -r touchBegan
输出：
Breakpoint 9: 5 locations.
这个说明是第9组下了断点，共下了5处断点，但是我们项目只有一个处实现了，说明给底层函数中也可以使用这种方式下断点，我们可以使用 breakpoint list进行验证
输入：
breakpoint list
输出：
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 5
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x000000010d8e1b40, resolved, hit count = 5
2: name = 'demo1', locations = 1, resolved = 1, hit count = 4
2.1: where = LLDB调试`-[ViewController demo1] at ViewController.m:27, address = 0x000000010d8e1be0, resolved, hit count = 4
3: names = {'[ViewController douYinClick:]', '[ViewController douYinClick:]'}, locations = 1, resolved = 1, hit count = 0
3.1: where = LLDB调试`-[ViewController douYinClick:] at ViewController.m:34, address = 0x000000010d8e1c10, resolved, hit count = 0
4: file = 'ViewController.m', line = 23, exact_match = 0, locations = 1, resolved = 1, hit count = 3
4.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] + 77 at ViewController.m:23:5, address = 0x000000010d8e1b8d, resolved, hit count = 3
5: address = LLDB调试[0x0000000100001b97], locations = 1, resolved = 1, hit count = 3
5.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] + 87 at ViewController.m:24:6, address = 0x000000010d8e1b97, resolved, hit count = 3
6: name = 'kuaiShouClick', locations = 0 (pending)
7: name = 'kuaiShouClick', locations = 0 (pending)
8: name = 'kuaiShouClick:', locations = 1, resolved = 1, hit count = 0
8.1: where = LLDB调试`-[ViewController kuaiShouClick:] at ViewController.m:37, address = 0x000000010d8e1c60, resolved, hit count = 0
9: regex = 'touchBegan', locations = 5, resolved = 5, hit count = 0
9.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
9.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
9.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
9.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, resolved, hit count = 0
9.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0
这里我们可以看到第九组共有5出断点，都是底层使用的方法，并且都包含touchBegan 字段方法名称
3.LLDB断点配置
其实断点配置还有很多，这里只是简单的列举几个：
- -i <count> (--ignore -count <count>)
输入：
breakpoint set -F wangZheClick: -i 3
- -o <boolean>只断住一次
输入：
breakpoint set -F wangZheClick: -o yes- -N 给断点添加别名
输入：
breakpoint set -F douYinClick: -N douyinBreakPoint
输出：
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 2
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x0000000105105b40, resolved, hit count = 2
3: name = 'douYinClick:', locations = 1, resolved = 1, hit count = 0
Names:
douyinBreakPoint
3.1: where = LLDB调试`-[ViewController douYinClick:] at ViewController.m:34, address = 0x0000000105105c10, resolved, hit count = 0
- -N 给断点添加别名
输入：
breakpoint set -n demo1 -c "i==10"
4.断点的禁用与启用和删除
- 查看断点列表：breakpoint list
输入：
breakpoint list
输出：
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 6
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 6
2: name = 'demo1', locations = 1, resolved = 1, hit count = 5
Condition: i==10
2.1: where = LLDB调试`-[ViewController demo1] at ViewController.m:29, address = 0x00000001094e2be0, resolved, hit count = 5 - 禁用第二组断点
输入：
breakpoint disable 2
输出：
1 breakpoints disabled.
查看下断点列表，说明第二组断点还在里面，只是没有启用
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
2: name = 'demo1', locations = 1 Options: disabled
Condition: i==10
2.1: where = LLDB调试`-[ViewController demo1] at ViewController.m:29, address = 0x00000001094e2be0, unresolved, hit count = 5 - 启用第二组断点
输入：
breakpoint enable 2注意：我在这里操作的时候都是以组为单位进行禁用断点和启用断点，因为一般情况下我们下断点一组都是只有一个断点；
如果是如下情况，我们使用:breakpoint set -r touchBegan,下断点后，共5处断点
breakpoint list
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
2: name = 'demo1', locations = 1, resolved = 1, hit count = 5
Condition: i==10
2.1: where = LLDB调试`-[ViewController demo1] at ViewController.m:29, address = 0x00000001094e2be0, resolved, hit count = 5
3: regex = 'touchBegan', locations = 5, resolved = 5, hit count = 0
3.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
3.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
3.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
3.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, resolved, hit count = 0
3.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0
我们只想给其中某一个方法下，可以找到它的编号：例如给[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:]这个方法下断点；
禁用输入：
breakpoint disable 3.3
启用输入：
breakpoint enable 3.3- 删除断点
1.删除所有断点
输入：
breakpoint delete
输出：
About to delete all breakpoints, do you want to do that?: [Y/n]
询问是否删除 Y
All breakpoints removed. (2 breakpoints)
查看breakpoint list
输出：No breakpoints currently set.
2.删除组断点
输入：
breakpoint delete 2
输出：
1 breakpoints deleted; 0 breakpoint locations disabled.
查看breakpoint list
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
3: regex = 'touchBegan', locations = 5, resolved = 5, hit count = 0
3.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
3.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
3.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
3.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, resolved, hit count = 0
3.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0 2.删除组内断点
输入：
breakpoint delete 3.4
输出：
0 breakpoints deleted; 1 breakpoint locations disabled.
查看Breakpoint list
Current breakpoints:
1: file = '/Users/a1/Desktop/GitHub/iOSLearn/LLDB/LLDB调试/LLDB调试/ViewController.m', line = 21, exact_match = 0, locations = 1, resolved = 1, hit count = 8
1.1: where = LLDB调试`-[ViewController touchesBegan:withEvent:] at ViewController.m:21, address = 0x00000001094e2b30, resolved, hit count = 8
3: regex = 'touchBegan', locations = 5, resolved = 4, hit count = 0
3.1: where = UIKitCore`-[_UIFocusFastScrollingRecognizer focusEnginePanGesture:touchBeganAtDigitizerLocation:], address = 0x00007fff47371559, resolved, hit count = 0
3.2: where = UIKitCore`-[UIKeyboardMenuView showAsHUDFromLocation:withInputView:touchBegan:], address = 0x00007fff4750b652, resolved, hit count = 0
3.3: where = UIKitCore`-[_UITextDocumentInterface _setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff47518923, resolved, hit count = 0
3.4: where = UIKitCore`-[_UIInputViewControllerOutput setInputModeList:touchBegan:fromLocation:updatePoint:], address = 0x00007fff475196ce, unresolved, hit count = 0 Options: disabled
3.5: where = MapKit`-[MKActionRowItemView _touchBegan], address = 0x00007fff2768f2d6, resolved, hit count = 0 删除组内断点的时候，失败了，查询后发下组内断点还是存在的，说明删除断点的时候只能按照组进行删除,
5.查看 LLDB 的其他指令
直接在LLDB 上 输入 ：help 就可以查看其他的指令了，这里太多了，就不贴过来了；
可以搜索部分比如：help breakpoint,就是查看 breakpoint下的所有指令。
输入：
help breakpoint
输出：
Commands for operating on breakpoints (see 'help b' for shorthand.)
Syntax: breakpoint <subcommand> [<command-options>]
The following subcommands are supported:
clear -- Delete or disable breakpoints matching the specified source
file and line.
command -- Commands for adding, removing and listing LLDB commands
executed when a breakpoint is hit.
delete -- Delete the specified breakpoint(s). If no breakpoints are
specified, delete them all.
disable -- Disable the specified breakpoint(s) without deleting them. If
none are specified, disable all breakpoints.
enable -- Enable the specified disabled breakpoint(s). If no breakpoints
are specified, enable all of them.
list -- List some or all breakpoints at configurable levels of detail.
modify -- Modify the options on a breakpoint or set of breakpoints in
the executable. If no breakpoint is specified, acts on the
last created breakpoint. With the exception of -e, -d and -i,
passing an empty argument clears the modification.
name -- Commands to manage name tags for breakpoints
read -- Read and set the breakpoints previously saved to a file with
"breakpoint write".
set -- Sets a breakpoint or set of breakpoints in the executable.
write -- Write the breakpoints listed to a file that can be read in
with "breakpoint read". If given no arguments, writes all
breakpoints.
For more help on any particular subcommand, type 'help <command> <subcommand>'.6.断点的简写
b -f ViewController.m -r Clicked: 等同于：breakpoint set --file ViewController.m -r Clicked:
b：breakpoint set-f：--file-n：--name
但是 breakpoint list 、breakpoint disable 等只能简写成 break li、break dis ，因为简写的 b 后面默认会带上 set 的。
这一篇文章主要描述一下LLDB中我们经常使用的断点调试方式，下一篇文章讲下LLDB的进阶用法。
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