问题原因：

苹果又给我们挖坑了，iOS 16屏幕旋转报错：[Orientation] BUG IN CLIENT OF UIKIT: Setting UIDevice.orientation is not supported. Please use UIWindowScene.requestGeometryUpdate(_:)

坑：听说xcode 14 和 xcode 13编译出的安装包效果不一，经测试确实如此！还是要打包测试完毕以后再上线哦！

解决办法：

坑1、

经过实验，以前的方法直接给UIDevice setOrientation: 的方式还是生效的，只不过需要适配一下。

首先我们应该注意到iOS 16新增加了一个方法：setNeedsUpdateOfSupportedInterfaceOrientations

/// Notifies the view controller that a change occurred that affects supported interface orientations or the preferred interface orientation for presentation.
/// By default, this will animate any changes to orientation. To perform a non-animated update, call within `[UIView performWithoutAnimation:]`.
- (void)setNeedsUpdateOfSupportedInterfaceOrientations API_AVAILABLE(ios(16.0));

这和更新状态栏的方法有点像，简单点说就是你想转屏可以，需要通知UIViewController 你已经准备好要转屏的方向了，然后再调用转屏方法即可（转屏方法后面会讲到）。

坑2、

调用完转屏方法以后，view需要重新更新frame，这时候你会发现获取到的屏幕宽高并不是你要转屏以后的结果。难道是在iOS 16中转屏不及时更新UIScreen的size了？可能是吧！这里我们就需要自己判断一下到底需要什么样的宽度和高度啦！

坑3、

据我实验 - (BOOL)shouldAutorotate{} 在iOS 16中不再起效果！不管返回YES还是NO都能转屏！！！反而是需要控制- (UIInterfaceOrientationMask)supportedInterfaceOrientations有效果，神奇不！！

坑4、

据我实验在iOS 16中转屏的时候，直接获取设备方向：

UIDeviceOrientation orientation = [UIDevice currentDevice].orientation;

将返回UIDeviceOrientationUnknown，是不是神坑！！！！！

转屏方法总结：

iOS 16以前的写法：如果你还在用Xcode13，且配合使用setNeedsUpdateOfSupportedInterfaceOrientations，此方案编译的包在iOS 16上依然有效！

if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {SEL selector = NSSelectorFromString(@"setOrientation:");NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];[invocation setSelector:selector];[invocation setTarget:[UIDevice currentDevice]];int val = UIDeviceOrientationPortrait;[invocation setArgument:&val atIndex:2];[invocation invoke];
}
[UIViewController attemptRotationToDeviceOrientation];

当然，据实验所知，iOS 16以后也能用，只不过会有日志警告。如果你用Xcode 14 ，此方案在iOS 16上就不好用了！

iOS 16的写法：建议升级Xcode 14

if (@available(iOS 16.0, *)) {// setNeedsUpdateOfSupportedInterfaceOrientations 方法是 UIViewController 的方法[self setNeedsUpdateOfSupportedInterfaceOrientations];NSArray *array = [[[UIApplication sharedApplication] connectedScenes] allObjects];UIWindowScene *scene = [array firstObject];// 屏幕方向UIInterfaceOrientationMask orientation = isLaunchScreen ? UIInterfaceOrientationMaskLandscape: UIInterfaceOrientationMaskPortrait;UIWindowSceneGeometryPreferencesIOS *geometryPreferencesIOS = [[UIWindowSceneGeometryPreferencesIOS alloc] initWithInterfaceOrientations:orientation];// 开始切换[scene requestGeometryUpdateWithPreferences:geometryPreferencesIOS errorHandler:^(NSError * _Nonnull error) {NSLog(@"错误:%@", error);}];
}

当然如果你没有升级到Xcode 14，还可以这样写：（据我实验不好用，只能横屏，不能再转到竖屏，不推荐此方案！）

if (@available(iOS 16.0, *)) {void (^errorHandler)(NSError *error) = ^(NSError *error) {NSLog(@"错误:%@", error);};
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Warc-performSelector-leaks"SEL supportedInterfaceSelector = NSSelectorFromString(@"setNeedsUpdateOfSupportedInterfaceOrientations");[self performSelector:supportedInterfaceSelector];NSArray *array = [[UIApplication sharedApplication].connectedScenes allObjects];UIWindowScene *scene = (UIWindowScene *)[array firstObject];Class UIWindowSceneGeometryPreferencesIOS = NSClassFromString(@"UIWindowSceneGeometryPreferencesIOS");if (UIWindowSceneGeometryPreferencesIOS) {SEL initWithInterfaceOrientationsSelector = NSSelectorFromString(@"initWithInterfaceOrientations:");UIInterfaceOrientationMask orientation = UIInterfaceOrientationMaskPortrait;id geometryPreferences = [[UIWindowSceneGeometryPreferencesIOS alloc] performSelector:initWithInterfaceOrientationsSelector withObject:@(orientation)];if (geometryPreferences) {SEL requestGeometryUpdateWithPreferencesSelector = NSSelectorFromString(@"requestGeometryUpdateWithPreferences:errorHandler:");if ([scene respondsToSelector:requestGeometryUpdateWithPreferencesSelector]) {[scene performSelector:requestGeometryUpdateWithPreferencesSelector withObject:geometryPreferences withObject:errorHandler];}}}
#pragma clang diagnostic pop
}

另外一个需求：如果你的页面不需要自动转屏，只需要点击按钮触发转屏。你还可以这样写：

横屏按钮点击事件：

if (@available(iOS 16, *)) {_landscape = YES;[self setNeedsUpdateOfSupportedInterfaceOrientations];
}

竖屏按钮点击事件：

if (@available(iOS 16, *)) {_landscape = NO;[self setNeedsUpdateOfSupportedInterfaceOrientations];
}

再加一个方法：

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {if (_landscape){//横屏return UIInterfaceOrientationMaskLandscape;}else{//竖屏return UIInterfaceOrientationMaskPortrait;}
}

极简单的代码即可完成你想要的效果。