iOS: Update screen properties when we trigger statusbar changes on iOS7

Ideally we'd have a callback from iOS when this happens, so we can also
react to changes done outside of Qt, but willChangeStatusBarFrame and
friends do not seem to give us what we want.

Change-Id: I686ce7950395a83c4257372363c773a95c3935ed
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@digia.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/src/plugins/platforms/ios/qiosscreen.mm b/src/plugins/platforms/ios/qiosscreen.mm
index 57522cb1a3..96410952f9 100644
--- a/src/plugins/platforms/ios/qiosscreen.mm
+++ b/src/plugins/platforms/ios/qiosscreen.mm
@@ -189,6 +189,9 @@ void QIOSScreen::updateProperties()
 
 void QIOSScreen::updateStatusBarVisibility()
 {
+    if (!isQtApplication())
+        return;
+
     QWindow *focusWindow = QGuiApplication::focusWindow();
 
     // If we don't have a focus window we leave the status
@@ -199,20 +202,26 @@ void QIOSScreen::updateStatusBarVisibility()
         return;
 
     UIView *view = reinterpret_cast<UIView *>(focusWindow->handle()->winId());
+    QIOSViewController *viewController = static_cast<QIOSViewController *>(view.viewController);
+
+    bool currentStatusBarVisibility = [UIApplication sharedApplication].statusBarHidden;
+    if (viewController.prefersStatusBarHidden == currentStatusBarVisibility)
+        return;
+
 #if QT_IOS_PLATFORM_SDK_EQUAL_OR_ABOVE(__IPHONE_7_0)
     if (QSysInfo::MacintoshVersion >= QSysInfo::MV_IOS_7_0) {
-        [view.viewController setNeedsStatusBarAppearanceUpdate];
+        [viewController setNeedsStatusBarAppearanceUpdate];
+        dispatch_async(dispatch_get_main_queue(), ^{
+            updateProperties();
+        });
     } else
 #endif
     {
-        bool wasHidden = [UIApplication sharedApplication].statusBarHidden;
-        QIOSViewController *viewController = static_cast<QIOSViewController *>(view.viewController);
         [[UIApplication sharedApplication]
             setStatusBarHidden:[viewController prefersStatusBarHidden]
             withAnimation:UIStatusBarAnimationNone];
 
-        if ([UIApplication sharedApplication].statusBarHidden != wasHidden)
-            updateProperties();
+        updateProperties();
     }
 }