explicitely check if effectiveApperance is available

PeterPetrik · wonder-sk · commit b7669698b5d7 · 2018-11-22T13:06:34.000+01:00
(cherry picked from commit a139f8d)
diff --git a/src/native/mac/qgsmacnative.mm b/src/native/mac/qgsmacnative.mm
@@ -122,7 +122,7 @@ - ( BOOL )userNotificationCenter:( NSUserNotificationCenter * )center shouldPres
 bool QgsMacNative::hasDarkTheme()
 {
 #if __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_14
-  if (@available(macOS 10.14, *)) {
+  if ([NSApp respondsToSelector:@selector(effectiveAppearance)]) {
     // compiled on macos 10.14+ AND running on macos 10.14+
     // check the settings of effective appearance of the user
     NSAppearanceName appearanceName = [NSApp.effectiveAppearance bestMatchFromAppearancesWithNames:@[NSAppearanceNameAqua, NSAppearanceNameDarkAqua]];

Original file line number	Diff line number	Diff line change
`@@ -122,7 +122,7 @@ - ( BOOL )userNotificationCenter:( NSUserNotificationCenter * )center shouldPres`
`122`	`122`	`bool QgsMacNative::hasDarkTheme()`
`123`	`123`	`{`
`124`	`124`	`#if __MAC_OS_X_VERSION_MAX_ALLOWED >= __MAC_10_14`
`125`		`- if (@available(macOS 10.14, *)) {`
	`125`	`+ if ([NSApp respondsToSelector:@selector(effectiveAppearance)]) {`
`126`	`126`	`// compiled on macos 10.14+ AND running on macos 10.14+`
`127`	`127`	`// check the settings of effective appearance of the user`
`128`	`128`	`NSAppearanceName appearanceName = [NSApp.effectiveAppearance bestMatchFromAppearancesWithNames:@[NSAppearanceNameAqua, NSAppearanceNameDarkAqua]];`