How do I programmatically set device orientation in iOS 7?

For iOS 7 & 8:

Objective-C:

NSNumber *value = [NSNumber numberWithInt:UIInterfaceOrientationLandscapeLeft];
[[UIDevice currentDevice] setValue:value forKey:@"orientation"];

Swift 3+:

let value = UIInterfaceOrientation.landscapeLeft.rawValue
UIDevice.current.setValue(value, forKey: "orientation")

I call it in - viewDidAppear:.

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