以调试设备界面为例,改变背景颜色、获取VPN界面UISwitch控件响应事件.

Mac通过ssh连接越狱设备,默认密码alpine

Nelson:~ Nelson$ ssh root@192.168.xx.xxx

启动Preferences进程,开启1234端口,等待任意IP地址的lldb接入

# debugserver -x backboard *:1234 /Applications/Preferences.app/Preferences

Nelson-iPad:~ root# debugserver -x backboard *:1234 /Applications/Preferences.app/Preferences
debugserver-@(#)PROGRAM:debugserver  PROJECT:debugserver-340.3.51.1
 for arm64.
Listening to port 1234 for a connection from *...

Mac启动新窗口终端,进入Xcode的lldb调试模式

# /Applications/Xcode.app/Contents/Developer/usr/bin/lldb

Nelson:~ Nelson$ /Applications/Xcode.app/Contents/Developer/usr/bin/lldb
(lldb) 

连接正在等待的debugserver

# process connect connect://192.168.xx.xxx:1234

(lldb) process connect connect://192.168.xx.xxx:1234
Process 6529 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = signal SIGSTOP
    frame #0: 0x00000001819f54bc libsystem_kernel.dylib`mach_msg_trap + 8
libsystem_kernel.dylib`mach_msg_trap:
->  0x1819f54bc <+8>: ret    

libsystem_kernel.dylib`mach_msg_overwrite_trap:
    0x1819f54c0 <+0>: mov    x16, #-0x20
    0x1819f54c4 <+4>: svc    #0x80
    0x1819f54c8 <+8>: ret    
(lldb)  

打印所有界面层次

(lldb) po [[[UIApplication sharedApplication] keyWindow] recursiveDescription]

recursiveDescription

搜索UITableView:获取内存地址为0x13e051800

8EAB695B-6F43-4475-B7A8-FE6138BB3AB2.jpeg

修改UITableView(0x13e051800)的背景颜色为yellowColor

(lldb) po [(UITableView*)0x13e051800 setBackgroundColor:[UIColor yellowColor]]

现在界面处理调试状态,需要手动刷新下界面

(lldb) e (void)[CATransaction flush]

IMG_0142.PNG

修改另外一个UITableView(0x13e8ac400)的背景颜色

(lldb) po [(UITableView*)0x13e8ac400 setBackgroundColor:[UIColor greenColor]]
(lldb) e (void)[CATransaction flush]

IMG_0144.PNG

获取VPN界面的UISwitch的allTargets

IMG_0144.PNG

(lldb) po [(UISwitch *)0x13f263980 allTargets]

(lldb) po [(UISwitch *)0x13f263980 allTargets]
{(
    <VPNToggleCell: 0x13e0c3400; baseClass = UITableViewCell; frame = (0 55.5; 594.5 45); text = '状态'; autoresize = W; tag = 6; layer = <CALayer: 0x13f004a80>>
)}

(lldb) 

此处的Target为上一步获取到的VPNToggleCell(0x13e0c3400)

(lldb) po [(UISwitch *)0x13f263980 actionsForTarget:(id)0x13e0c3400 forControlEvent:0]

(lldb) po [(UISwitch *)0x13f263980 actionsForTarget:(id)0x13e0c3400 forControlEvent:0]
<__NSArrayM 0x13ddd9ca0>(
controlChanged:
)
(lldb)

获取到了UISwitch的响应方法为controlChanged:,接下来为UISwitch的点击添加断点

(lldb) br set -n "-[VPNToggleCell controlChanged:]"
Breakpoint 1: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.

添加断点失败了,也就是说明controlChanged:这个方法不属于VPNToggleCell这个类,于是查找Runtime Header,找到了PSControlTableCell这个类
PSControlTableCell.h

412C86A5-F95D-40CF-9D6B-B82D15FED827.png

(lldb) br set -n "-[PSControlTableCell controlChanged:]"

(lldb) br set -n "-[PSControlTableCell controlChanged:]"
Breakpoint 3: where = Preferences`-[PSControlTableCell controlChanged:], address = 0x0000000189488618
(lldb) 

断点添加成功了,查看下所有的断点列表

(lldb) br list

(lldb) br list
Current breakpoints:
3: name = '-[PSControlTableCell controlChanged:]', locations = 1, resolved = 1, hit count = 0
  3.1: where = Preferences`-[PSControlTableCell controlChanged:], address = 0x0000000189488618, resolved, hit count = 0 

(lldb)

按需求可以对断点进行以下操作:
3针对以上的断点序号
禁用断点:(lldb) br dis 3
启用断点:(lldb) br en 3
删除断点:(lldb) br del 3

退出调试状态

(lldb) c

此时界面可以进行操作了,点击VPN界面的UISwitch执行了断点操作,再次进入了调试模式

(lldb) c
Process 6529 resuming
Process 6529 stopped
* thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 3.1
    frame #0: 0x0000000189488618 Preferences`-[PSControlTableCell controlChanged:]
Preferences`-[PSControlTableCell controlChanged:]:
->  0x189488618 <+0>:  stp    x24, x23, [sp, #-0x40]!
    0x18948861c <+4>:  stp    x22, x21, [sp, #0x10]
    0x189488620 <+8>:  stp    x20, x19, [sp, #0x20]
    0x189488624 <+12>: stp    x29, x30, [sp, #0x30]
(lldb)  

执行c、s进行下一步操作

(lldb) c

(lldb) n

进入调试模式

(lldb) process interrupt

lldb其他指令