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Asked: 2026-05-10T17:38:14+00:00

What happens to exceptions raised while in myMethod: if it is invoked via NSObject’s

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What happens to exceptions raised while in myMethod: if it is invoked via NSObject’s performSelectorOnMainThread:withObject:waitUntilDone:?

In particular, can I catch them in the scope of the call to performSelectorOnMainThread like this…

@try {     [self performSelectorOnMainThread:@selector(myMethod) withObject:nil waitUntilDone:YES]; } @catch(NSException *e) {     //deal with exception raised in myMethod here?? }

I realize that the semantics of this are weird if waitUntilDone is NO.

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1 Answer

  1. You won’t be able to catch them like that. Cocoa may catch and log the exceptions to the console, but it won’t re-raise them in the thread that called -perform. Instead, you could catch them in -myMethod: (or a wrapper that calls -myMethod:) and have it store them somewhere that your other thread can read them.

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