gistfile1.m

//Do NOT do this

//This will correctly attach
[FirstViewController aspect_hookSelector:@selector(viewDidAppear:) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo>aspectInfo, BOOL animated){
        //stuff
} error:NULL];

//This won’t attach and will throw a warning
[SecondViewController aspect_hookSelector:@selector(viewDidAppear:) withOptions:AspectPositionAfter usingBlock:^(id<AspectInfo>aspectInfo, BOOL animated){
        //stuff
} error:NULL];