iOS: let QIOSScreen use correct orientation at startup

When QScreen is created, we need to check if the application
is already in landscape.

Change-Id: I653c622154a5c23ec93e89ec3e80fefb6b1f1bdd
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@digia.com>

src/plugins/platforms/ios/qiosscreen.mm

@@ -42,6 +42,7 @@
 #include "qiosscreen.h"
 #include "qioswindow.h"
 #include <qpa/qwindowsysteminterface.h>
+#include "qiosapplicationdelegate.h"
 
 #include <sys/sysctl.h>
 
@@ -185,6 +186,12 @@ QIOSScreen::QIOSScreen(unsigned int screenIndex)
     const qreal millimetersPerInch = 25.4;
     m_physicalSize = QSizeF(m_geometry.size()) / unscaledDpi * millimetersPerInch;
 
+    if ([[UIApplication sharedApplication].delegate isKindOfClass:[QIOSApplicationDelegate class]]) {
+        // When in a non-mixed environment, let QScreen follow the current interface orientation:
+        UIViewController *controller = [UIApplication sharedApplication].delegate.window.rootViewController;
+        setPrimaryOrientation(toQtScreenOrientation(controller.interfaceOrientation));
+    }
+
     [pool release];
 }