UIWindow with wrong size when using landscape orientation

I had a similar problem, for a portrait-only app.

I fixed the problem by setting status bar orientation BEFORE instantiate the UIWindow

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Init my stuff
    // ...

    // Prepare window
    [application setStatusBarOrientation:UIInterfaceOrientationPortrait animated:NO]; // prevent start orientation bug
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    [self.window makeKeyAndVisible];
    return YES;
}

In your case, you should use UIInterfaceOrienationLandscapeLeft (or Right) in the setStatusBarOrientation:animated: method.

Hope it helps you.

When you run landscape app from portrait mode UIScreen has portrait bounds in iOS 8 (only if you haven't this app in app switch panel, as iOS 8 makes some cache). Even displaying window with makeKeyAndVisible doesn't change it's frame. But it changes [UIScreen mainScreen].bounds according to AppViewController avaliable orientation.

#import "AppDelegate.h"
#import "AppViewController.h"

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  // Portrait bounds at this point
  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

  self.window.backgroundColor = [UIColor cyanColor];
  self.window.rootViewController = [[AppViewController alloc] init];
  [self.window makeKeyAndVisible];
  return YES;
}

@end

So let's change window's frame after [self.window makeKeyAndVisible]

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [UIWindow new];
    self.window.backgroundColor = [UIColor cyanColor];
    self.window.rootViewController = [[AppViewController alloc] init];
    [self.window makeKeyAndVisible];

    // Here it is
    self.window.frame = [UIScreen mainScreen].bounds;
    return YES;
}

I think that it is iOS 8 bug.

You can rotate UIWindow by adding single line only. You can set the rootController for your UIWindow. e.g:

fileprivate(set) var bottonOverlayWindow = UIWindow()

self.bottonOverlayWindow.rootViewController = self; 

// 'self' will the ViewController on which you had added UIWindow view. So whenever you ViewController change the orientation, your window view also change it's orientation.

Let me know if you face any issue.

Personally, none of the solution presented above worked. I finally set "hidden" to YES for the window in my main xib, as first suggested here: unexpected nil window in _UIApplicationHandleEventFromQueueEvent, _windowServerHitTestWindow