MACatchException & -[AppMonitorT

小编毛推自荐常用基本类型MACatchException，不足之处，欢迎指正。

image.png
image.png

近期升级了几家第三方SDK，新版本上线后，友盟统计出现如下错误

-[AppMonitorTaskPool start]: attempt to start the thread again

*** -[AppMonitorTaskPool start]: attempt to start the thread again
(null)
((
    0 CoreFoundation 0x0000000213085294 <redacted> + 252
    1 libobjc.A.dylib 0x000000021225f9f8 objc_exception_throw + 56
    2 CoreFoundation 0x0000000212f8f4b0 <redacted> + 0
    3 Foundation 0x00000002139dc6ec <redacted> + 132
    4 CoreFoundation 0x0000000212ff6318 <redacted> + 20
    5 CoreFoundation 0x0000000212ff62e4 <redacted> + 64
    6 CoreFoundation 0x0000000212ff57d8 <redacted> + 392
    7 CoreFoundation 0x0000000212ff5484 <redacted> + 96
    8 CoreFoundation 0x0000000212f6ed64 <redacted> + 1496
    9 CoreFoundation 0x0000000212ff4f34 _CFXNotificationPost + 696
    10 Foundation 0x00000002139dd7f4 <redacted> + 68
    11 UIKitCore 0x000000023f83dd0c <redacted> + 1328
    12 UIKitCore 0x000000023f10c4a0 <redacted> + 472
    13 UIKitCore 0x000000023f10d188 _performActionsWithDelayForTransitionContext + 112
    14 UIKitCore 0x000000023f10c25c <redacted> + 244
    15 UIKitCore 0x000000023f110f5c <redacted> + 360
    16 UIKitCore 0x000000023f441054 <redacted> + 464
    17 FrontBoardServices 0x0000000215a015d8 <redacted> + 224
    18 libdispatch.dylib 0x0000000212ac57d4 <redacted> + 16
    19 libdispatch.dylib 0x0000000212a6a5d8 <redacted> + 224
    20 FrontBoardServices 0x0000000215a3b040 <redacted> + 40
    21 FrontBoardServices 0x0000000215a3acdc <redacted> + 408
    22 FrontBoardServices 0x0000000215a3b294 <redacted> + 52
    23 CoreFoundation 0x0000000213017018 <redacted> + 24
    24 CoreFoundation 0x0000000213016f98 <redacted> + 88
    25 CoreFoundation 0x0000000213016880 <redacted> + 176
    26 CoreFoundation 0x00000002130117bc <redacted> + 1004
    27 CoreFoundation 0x00000002130110b0 CFRunLoopRunSpecific + 436
    28 GraphicsServices 0x000000021521179c GSEventRunModal + 104
    29 UIKitCore 0x000000023f847978 UIApplicationMain + 212
    30 xxx 0x0000000104f568f0 xxx + 3303664
    31 libdyld.dylib 0x0000000212ad68e0 <redacted> + 4
)
dSYM UUID: 515BDE4D-BECB-39B3-98AE-41D4F096F0DC
CPU Type: arm64
Slide Address: 0x0000000100000000
Binary Image: xxx
Base Address: 0x0000000104c30000

了解后没什么收获，但发现有类似错误

 *** -[NSTread start]: attempt to start the thread again

经了解发现 AppMonitorTaskPool 是NSTread的子类，为了规避这个错误，自定义NSThread【分类】，通过【RunTime-方法替换】方式，重新定义了start方法。到目前为止，断点调试，仅发现下图调用堆栈中有AppMonitorTaskPool的使用

112.png

该方法能避免常见crash，并将crash信息发送给server，准确定位。

重点介绍RunTime-方法替换

常用基本类型MACatchException，不足之处，欢迎指正。

当前工程选用了最高编译策略

113.png