From b79b75adf93afa983217f5c7fdd40044909a0ad2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Andr=C3=A9=20Klitzing?= <aklitzing@gmail.com>
Date: Mon, 14 Sep 2020 13:46:56 +0200
Subject: Fix -Wunguarded-availability-new for userInterfaceStyle
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'userInterfaceStyle' is only available on iOS 12.0 or newer [-Werror,-Wunguarded-availability-new]
       if (previousTraitCollection.userInterfaceStyle != self.traitCollection.userInterfaceStyle) {

Pick-to: 5.15
Change-Id: Id6340f70019d55ab2a0707b1aebd6d333e9544cb
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
---
 src/plugins/platforms/ios/qiosscreen.mm | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/plugins/platforms/ios/qiosscreen.mm b/src/plugins/platforms/ios/qiosscreen.mm
index 80636ab9c6..411f6ebf81 100644
--- a/src/plugins/platforms/ios/qiosscreen.mm
+++ b/src/plugins/platforms/ios/qiosscreen.mm
@@ -213,10 +213,12 @@ static QIOSScreen* qtPlatformScreenFor(UIScreen *uiScreen)
 {
     [super traitCollectionDidChange:previousTraitCollection];
 
-    if (self.screen == UIScreen.mainScreen) {
-        if (previousTraitCollection.userInterfaceStyle != self.traitCollection.userInterfaceStyle) {
-            QIOSTheme::initializeSystemPalette();
-            QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>(nullptr);
+    if (@available(iOS 12, *)) {
+        if (self.screen == UIScreen.mainScreen) {
+            if (previousTraitCollection.userInterfaceStyle != self.traitCollection.userInterfaceStyle) {
+                QIOSTheme::initializeSystemPalette();
+                QWindowSystemInterface::handleThemeChange<QWindowSystemInterface::SynchronousDelivery>(nullptr);
+            }
         }
     }
 }
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