RootViewController *rvController = [[RootViewController alloc] initWithNibName:@"RootViewController" bundle:[NSBundle mainBundle]];
sometimes i see it use nil ,i dont know what exactly it use for?
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Here is the exact explanation for that:
I think [NSBundle mainBundle] doesn’t do anything different than you put nil. However, if you want to do internationalization and localization, you can use them
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