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Inaccurate quiz question
"If we provide appropriately sized images in an Asset Catalog, will iOS automatically swap the 3.5 inch and 4 inch versions of an image based on the device the app is running on?"
It's not that big of a deal but the reason why the launch images didn't automatically switch was because (initially) he had his 4" image unassigned. A way to test this would be to put an entirely new image as the 4" version and just switch simulators between 3.5 and 4 and you'll see them change automatically. Thanks just pointing that out.
EDIT: Also it's worth noting that in the video Ben used the actual file name of the image when actually with assets you just use the asset name, ie [UIImage imageNamed: @"BackgroundImage"]; instead of [UIImage imageNamed:@"somePic@2x"];