我是用Objective C.编写的iOS版AudioUnit主机的作者。
在iOS 14中，它开始在任何AU工具的实例化时崩溃，但相同的AU在其他主机中也能工作。如果我在instantiateWithComponentDescription的完成处理程序中插入一个break，那么在调用其他任何东西之前，我一退出(但不继续(就会立即看到一个错误：
Error in destroying pipe Error Domain=NSCocoaErrorDomain Code=4099 "The connection on anonymousListener or serviceListener from pid 630 was invalidated from this process." UserInfo={NSDebugDescription=The connection on anonymousListener or serviceListener from pid 630 was invalidated from this process.}
有时是4097。当然，对插件的下一次调用会使主机崩溃。在日志中，唯一吸引我眼球的条目是：
default 14:38:47.105386-0700 MPC Pro 2 [u 01E943B9-94B5-4BF2-8926-9E843EB6482D:m (null)] [<private>(<private>)] invalidating startup assertion
default 14:38:47.106987-0700 runningboardd Invalidating assertion 32-637-996 (target:[xpcservice<com.retronyms.digits.Phase84-Component([application<com.akai.impcpro2>:637])>:639]) from originator [application<com.akai.impcpro2>:637]
default 14:38:47.733485-0700 SpringBoard Workspace connection invalidated for <FBExtensionProcess: 0x156e2da50; xpcservice<com.retronyms.digits.Phase84-Component([application<com.akai.impcpro2>:637])>:639(v6BE)>
default 14:38:47.733583-0700 SpringBoard [xpcservice<com.retronyms.digits.Phase84-Component([application<com.akai.impcpro2>:637])>:639] Now flagged as pending exit for reason: workspace client connection invalidated
我是否需要访问该应用程序？如何从中获取更多调试信息？
如果ARC已被禁用，请确保在完成后强制AU保留：
[AUAudioUnit instantiateWithComponentDescription:descr options:{}
completionHandler:^(AUAudioUnit * nullable an_audio_unit, NSError * nullable
error) {
[an_audio_unit retain];
}];
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