Created
March 26, 2012 19:42
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Safe cross-thread passing of an error
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| - (BOOL)saveAndReturnError:(NSError **)error | |
| { | |
| NSManagedObjectContext *context = [self managedObjectContext]; | |
| __block BOOL result; | |
| [context performBlockAndWait:^{ | |
| result = [context save:error]; | |
| if (!result && error) [*error retain]; | |
| }]; | |
| if (!result && error) [*error autorelease]; | |
| return result; | |
| } |
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I think it is fine because (NSError *_) implies (_autoreleasing NSError) under ARC. And the block should capture the pointer to the actual NSError object that has a strong reference as a local variable to the caller. (and it seems to work fine in my tests :)