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Code Issues Releases Activity

[iOS] fix locking launcher screen to landscape on iPhone

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lock the Qt's root view controller instead of the Qt's app delegate
This commit is contained in:
Andrey Filipenkov
2026-01-19 11:22:27 +03:00
parent b20fa254c7
commit fe1845e32d
1 changed files with 13 additions and 9 deletions
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launcher/prepare_ios.mm
+13 -9
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@@ -16,8 +16,7 @@
namespace
{
UIInterfaceOrientationMask swizzled_supportedInterfaceOrientationsForWindow
(id __unused self, SEL __unused _cmd, UIApplication * __unused application, UIWindow * __unused _Nullable window)
UIInterfaceOrientationMask swizzled_supportedInterfaceOrientations(id __unused self, SEL __unused _cmd)
{
if(UIDevice.currentDevice.userInterfaceIdiom == UIUserInterfaceIdiomPad)
return UIInterfaceOrientationMaskAll;
@@ -29,12 +28,17 @@ namespace launcher
{
void prepareIos()
{
auto sel = @selector(application:supportedInterfaceOrientationsForWindow:);
auto methodDesc = protocol_getMethodDescription(@protocol(UIApplicationDelegate), sel, NO, YES);
auto appDelegateClass = object_getClass(UIApplication.sharedApplication.delegate);
[[maybe_unused]] auto existingImp = class_replaceMethod(
appDelegateClass, sel, (IMP)swizzled_supportedInterfaceOrientationsForWindow, methodDesc.types);
// also check implementation in qtbase - src/plugins/platforms/ios/qiosapplicationdelegate.mm
NSCAssert(existingImp == nullptr, @"original app delegate has this method, don't ignore it");
id __block observer = [NSNotificationCenter.defaultCenter addObserverForName:UIWindowDidBecomeKeyNotification object:nil queue:nil usingBlock:^(NSNotification * _Nonnull notification) {
[NSNotificationCenter.defaultCenter removeObserver:observer];
UIViewController * rootVc = [notification.object rootViewController];
auto sel = @selector(supportedInterfaceOrientations);
auto rootVcClass = object_getClass(rootVc);
auto methodDesc = method_getDescription(class_getInstanceMethod(rootVcClass, sel));
class_replaceMethod(rootVcClass, sel, (IMP)swizzled_supportedInterfaceOrientations, methodDesc->types);
if(@available(iOS 16.0, *))
[rootVc setNeedsUpdateOfSupportedInterfaceOrientations];
}];
}
}