iOS: Enable the ShowIsFullScreen style-hint so that show() implies fullscreen

We may need to qualify this setting for UC2, so that the user may still
create windows as sub-controls of a regular iOS user interface, but for
UC1 it makes sense.

Change-Id: I1a7019f901fabed8b5b9cbb18a929913780e6595
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>

src/plugins/platforms/ios/qiosintegration.h

@@ -60,6 +60,8 @@ public:
 
     QPlatformFontDatabase *fontDatabase() const;
 
+    QVariant styleHint(StyleHint hint) const;
+
     QAbstractEventDispatcher *guiThreadEventDispatcher() const;
     QPlatformNativeInterface *nativeInterface() const;
 

src/plugins/platforms/ios/qiosintegration.mm

@@ -106,6 +106,16 @@ QPlatformFontDatabase * QIOSIntegration::fontDatabase() const
     return m_fontDatabase;
 }
 
+QVariant QIOSIntegration::styleHint(StyleHint hint) const
+{
+    switch (hint) {
+    case ShowIsFullScreen:
+        return true;
+    default:
+        return QPlatformIntegration::styleHint(hint);
+    }
+}
+
 QPlatformNativeInterface *QIOSIntegration::nativeInterface() const
 {
     return const_cast<QIOSIntegration *>(this);