Only ONE VIEW landscape mode

by

Swift

AppDelegate.swift

internal var shouldRotate = false
func application(_ application: UIApplication,
                 supportedInterfaceOrientationsFor window: UIWindow?) -> UIInterfaceOrientationMask {
    return shouldRotate ? .allButUpsideDown : .portrait
}

Your landscape view controller

let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.shouldRotate = true // or false to disable rotation

Objective-C

AppDelegate.h

@property (assign, nonatomic) BOOL shouldRotate;

AppDelegate.m

- (UIInterfaceOrientationMask)application:(UIApplication *)application
 supportedInterfaceOrientationsForWindow:(UIWindow *)window {
    return self.shouldRotate ? UIInterfaceOrientationMaskAllButUpsideDown
                             : UIInterfaceOrientationMaskPortrait;
}

Your landscape view controller

AppDelegate *appDelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
[appDelegate setShouldRotate:YES]; // or NO to disable rotation

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