开源选择
目前找到比较好的一个开源库是这个
https://github.com/Tyilo/insert_dylib
至少我发现它是能够支持模拟器的。
原理
这些东西原理都一个样，通过修改LoadCommand来使得系统加载应用时顺便把你的dylib加载进来。
LoadCommand.png
取值
添加一个Command, value要如何取值
- dylib直接放在app目录下:
@executable_path/libtest.dylib - dylib放在已存在Frameworks目录下:
@rpath/libtest.dylib或@executable_path/Frameworks/libtest.dylib - dylib放在自己创建的Frameworks目录下:
@executable_path/Frameworks/libtest.dylib
用法
直接编译得到二进制后即可使用
坑1
为了方便重签名，我尝试总是将dylib放到Frameworks下面。当然，如果没有.app文件下面没有这个目录，我就为他创建一个，然后把dylib放进去。事实证明这样是不行的，会导致dylib加载失败。（如果原来Frameworks目录是存在的，是不会失败的）
Exception Type: EXC_CRASH (SIGABRT)
Exception Codes: 0x0000000000000000, 0x0000000000000000
Exception Note: EXC_CORPSE_NOTIFY
Termination Description: DYLD, Library not loaded: @rpath/libtest.dylib | Referenced from: /var/containers/Bundle/Application/9683F64B-63A5-4CD2-90D0-076CD85789E5/Test.app/Test | Reason: image not found
Triggered by Thread: 0
Filtered syslog:
None found
Thread 0 Crashed:
0 dyld 0x0000000103841cbc __abort_with_payload + 8
1 dyld 0x0000000103841668 abort_with_payload_wrapper_internal + 100
2 dyld 0x0000000103841694 fcntl + 0
3 dyld 0x0000000103820514 dyld::fastBindLazySymbol(ImageLoader**, unsigned long) + 0
4 dyld 0x00000001038229a8 dyld::_main(macho_header const*, unsigned long, int, char const**, char const**, char const**, unsigned long*) + 4072
5 dyld 0x000000010381d044 _dyld_start + 68
Thread 0 crashed with ARM Thread State (64-bit):
x0: 0x0000000000000006 x1: 0x0000000000000001 x2: 0x000000016fdde1b0 x3: 0x0000000000000082
x4: 0x000000016fddddb0 x5: 0x0000000000000000 x6: 0x0000000000000000 x7: 0x0000000000000e80
x8: 0x0000000000000020 x9: 0x0000000000000009 x10: 0x6f5a512f35453938 x11: 0x512f7070612e656e
x12: 0x20200a656e6f7a51 x13: 0x203a6e6f73616552 x14: 0x6f6e206567616d69 x15: 0x00646e756f662074
x16: 0x0000000000000209 x17: 0x0000000000000030 x18: 0x0000000000000000 x19: 0x0000000000000000
x20: 0x000000016fddddb0 x21: 0x0000000000000082 x22: 0x000000016fdde1b0 x23: 0x0000000000000001
x24: 0x0000000000000006 x25: 0x000000010384dab8 x26: 0x000000010384fbb8 x27: 0x9015bc02032200b8
x28: 0x000000010384d000 fp: 0x000000016fdddd80 lr: 0x0000000103841668
sp: 0x000000016fdddd40 pc: 0x0000000103841cbc cpsr: 0x00000000
Binary Images:
0x100020000 - 0x102bcffff Test arm64 <98ee4fcadd62340f838b652d5fe58ecb> /var/containers/Bundle/Application/9683F64B-63A5-4CD2-90D0-076CD85789E5/Test.app/Test
0x10381c000 - 0x10384bfff dyld arm64 <f54ed85a94253887886a8028e20ed8ba> /usr/lib/dyld
EOF
解决办法：
- 如果Frameworks文件夹是我们创建的话，使用
@executable_path/Frameworks/libtest.dylib而不是@rpath/libtest.dylib - 放在app目录下就好了，使用 ```@executable_path/libtest.dylib
