项目中针对某一个 View 需要进行横屏，在 iOS16 之前的方式大部分都是采取设置设备的方向来实现的，但是在 iOS16 开始这种方式已经无效了，如果使用设置设备方向来实现横竖屏切换，在 Xcode 的控制台中会输出以下信息:
[Orientation] BUG IN CLIENT OF UIKIT: Setting UIDevice.orientation is not supported. Please use UIWindowScene.requestGeometryUpdate(_:)
所以在 iOS16 开始如果要实现横竖屏切换，需要使用 UIWindowScene 的方式进行
iOS16 之前实现横竖屏切换方式
AppDelegate
在 AppDelegate 的 .h 文件中添加一个变量来记录是否需要进行横竖屏切换
@property (nonatomic, assign, getter=isLaunchScreen) BOOL launchScreen; /**< 是否是横屏 */
在 AppDelegate 的 .m 文件中重写 launchScreen 的 setter 方法
- (void)setLaunchScreen:(BOOL)launchScreen {
_launchScreen = launchScreen;
[self application:[UIApplication sharedApplication] supportedInterfaceOrientationsForWindow:nil];
}
并且实现 UIApplicationDelegate 的 application:supportedInterfaceOrientationsForWindow: 方法
- (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {
if (self.isLaunchScreen) {
// 只支持横屏，并且 Home 按键在右边
return UIInterfaceOrientationMaskLandscapeRight;
}
// 只支持竖屏
return UIInterfaceOrientationMaskPortrait;
}
在需要实现横竖屏切换的 View
接下来在需要切换横竖屏的 View 中增加以下方法，就能在 iOS16 之前实现该功能
/// 切换设备方向
/// - Parameter isLaunchScreen: 是否是全屏
- (void)p_switchOrientationWithLaunchScreen:(BOOL)isLaunchScreen {
AppDelegate *appdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
if (isLaunchScreen) {
// 全屏操作
appdelegate.launchScreen = YES;
} else {
// 退出全屏操作
appdelegate.launchScreen = NO;
}
// 设置设备的方向
[self p_swichToNewOrientation:isLaunchScreen ? UIInterfaceOrientationLandscapeRight : UIInterfaceOrientationPortrait];
}
/// iOS16 之前进行横竖屏切换方式
/// - Parameter interfaceOrientation: 需要切换的方向
- (void)p_swichToNewOrientation:(UIInterfaceOrientation)interfaceOrientation {
NSNumber *orientationTarget = [NSNumber numberWithInteger:interfaceOrientation];
[[UIDevice currentDevice] setValue:orientationTarget forKey:@"orientation"];
}
经过以上代码，就能实现在 iOS16 之前的设备上进行横竖屏切换，下面开始适配 iOS16 的横竖屏切换
iOS16 实现横竖屏切换
AppDelegate
跟 iOS16 之前方式一样，需要设置 launchScreen 标志变量，重写 launchScreen 的 setter 方法，实现 UIApplicationDelegate 的 application:supportedInterfaceOrientationsForWindow: 方法
在需要实现横竖屏切换的 View
在 p_switchOrientationWithLaunchScreen: 方法中增加 iOS16 适配
/// 切换设备方向
/// - Parameter isLaunchScreen: 是否是全屏
- (void)p_switchOrientationWithLaunchScreen:(BOOL)isLaunchScreen {
AppDelegate *appdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
if (isLaunchScreen) {
// 全屏操作
appdelegate.launchScreen = YES;
} else {
// 退出全屏操作
appdelegate.launchScreen = NO;
}
if (@available(iOS 16.0, *)) {
// setNeedsUpdateOfSupportedInterfaceOrientations 方法是 UIViewController 的方法，所以这个操作最好是放在控制器中去操作
[self setNeedsUpdateOfSupportedInterfaceOrientations];
NSArray *array = [[[UIApplication sharedApplication] connectedScenes] allObjects];
UIWindowScene *scene = [array firstObject];
// 屏幕方向
UIInterfaceOrientationMask orientation = isLaunchScreen ? UIInterfaceOrientationMaskLandscapeRight : UIInterfaceOrientationMaskPortrait;
UIWindowSceneGeometryPreferencesIOS *geometryPreferencesIOS = [[UIWindowSceneGeometryPreferencesIOS alloc] initWithInterfaceOrientations:orientation];
// 开始切换
[scene requestGeometryUpdateWithPreferences:geometryPreferencesIOS errorHandler:^(NSError * _Nonnull error) {
NSLog(@"强制%@错误:%@", isLaunchScreen ? @"横屏" : @"竖屏", error);
}];
} else {
[self p_swichToNewOrientation:isLaunchScreen ? UIInterfaceOrientationLandscapeRight : UIInterfaceOrientationPortrait];
}
}
如果 Xcode 没有更新到 14，需要采用委婉的方式进行实现
/// 切换设备方向
/// - Parameter isLaunchScreen: 是否是全屏
- (void)p_switchOrientationWithLaunchScreen:(BOOL)isLaunchScreen {
AppDelegate *appdelegate = (AppDelegate *)[UIApplication sharedApplication].delegate;
if (isLaunchScreen) {
// 全屏操作
appdelegate.launchScreen = YES;
} else {
// 退出全屏操作
appdelegate.launchScreen = NO;
}
if (@available(iOS 16.0, *)) {
void (^errorHandler)(NSError *error) = ^(NSError *error) {
NSLog(@"强制%@错误:%@", isLaunchScreen ? @"横屏" : @"竖屏", 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 = isLaunchScreen ? UIInterfaceOrientationMaskLandscapeRight : 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
} else {
[self p_swichToNewOrientation:isLaunchScreen ? UIInterfaceOrientationLandscapeRight : UIInterfaceOrientationPortrait];
}
}
横竖屏切换.gif
接下来，讲解一下关于视频的横竖屏切换
场景：竖屏状态，视频只是占了屏幕的一小部分，横屏需要铺满整个屏幕
视频横竖屏切换
先将 redView 占屏幕的一小部分，切换横竖屏效果如下:
视频横竖屏切换.gif
监听横竖屏状态
在这里横屏状态需要铺满整个屏幕，在 iOS16 之前监听 UIDeviceOrientationDidChangeNotification 通知，在监听方法中进行对 redView 的约束更新，但是在 iOS16 开始，这个通知并不会一定有(我这边有时候有，有时候没有通知过来)，在找了一遍官方文档之后，发现 UIViewController 从 iOS8 开始就有一个方法 viewWillTransitionToSize:withTransitionCoordinator:
/*
This method is called when the view controller's view's size is changed by its parent (i.e. for the root view controller when its window rotates or is resized).
当 UIViewController 的 view 大小被其父级更改时（即当根控制器的窗口旋转或调整大小时），将调用此方法
If you override this method, you should either call super to propagate the change to children or manually forward the change to children.
*/
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id <UIViewControllerTransitionCoordinator>)coordinator API_AVAILABLE(ios(8.0));
于是在这里就不需要监听 UIDeviceOrientationDidChangeNotification 通知了
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
NSLog(@"view 发生改变:%@", NSStringFromCGSize(size));
BOOL isLaunchScreen = NO;
if (@available(iOS 16.0, *)) {
// iOS16 需要使用 UIWindowScene 来区分横竖屏
NSArray *array = [[[UIApplication sharedApplication] connectedScenes] allObjects];
UIWindowScene *scene = [array firstObject];
isLaunchScreen = scene.interfaceOrientation == UIInterfaceOrientationLandscapeRight;
} else {
// 这里是 UIDeviceOrientationLandscapeLeft（我们需要 Home 按键在右边）
// UIDeviceOrientationLandscapeLeft, // Device oriented horizontally, home button on the right
isLaunchScreen = [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft;
}
NSLog(@"将要%@", isLaunchScreen ? @"横屏" : @"竖屏");
}
打印信息:
<主>-[YXCLaunchScreenController viewWillTransitionToSize:withTransitionCoordinator:] 47行 : view 发生改变:{812, 375}
<主>-[YXCLaunchScreenController viewWillTransitionToSize:withTransitionCoordinator:] 57行 : 将要横屏
<主>-[YXCLaunchScreenController viewWillTransitionToSize:withTransitionCoordinator:] 47行 : view 发生改变:{375, 812}
<主>-[YXCLaunchScreenController viewWillTransitionToSize:withTransitionCoordinator:] 57行 : 将要竖屏
适配 redView
根据当前屏幕方向对 redView 进行适配，竖屏占屏幕一部分空间，横屏占满整个屏幕
- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator {
[super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
NSLog(@"view 发生改变:%@", NSStringFromCGSize(size));
BOOL isLaunchScreen = NO;
if (@available(iOS 16.0, *)) {
NSArray *array = [[[UIApplication sharedApplication] connectedScenes] allObjects];
UIWindowScene *scene = [array firstObject];
isLaunchScreen = scene.interfaceOrientation == UIInterfaceOrientationLandscapeRight;
} else {
// 这里是 UIDeviceOrientationLandscapeLeft（我们需要 Home 按键在右边）
// UIDeviceOrientationLandscapeLeft, // Device oriented horizontally, home button on the right
isLaunchScreen = [UIDevice currentDevice].orientation == UIDeviceOrientationLandscapeLeft;
}
NSLog(@"将要%@", isLaunchScreen ? @"横屏" : @"竖屏");
[self p_updateViewWithIsLaunchScreen:isLaunchScreen size:size];
}
/// 适配横竖屏约束
/// - Parameters:
/// - isLaunchScreen: 是否是横屏
/// - size: 当前控制器 View 的 size 大小
- (void)p_updateViewWithIsLaunchScreen:(BOOL)isLaunchScreen size:(CGSize)size {
if (isLaunchScreen) {
// 横屏
[self.redView mas_remakeConstraints:^(MASConstraintMaker *make) {
make.edges.equalTo(self.view);
}];
} else {
// 竖屏
[self.redView mas_remakeConstraints:^(MASConstraintMaker *make) {
make.center.left.right.equalTo(self.view);
make.height.mas_equalTo(150);
}];
}
}
最后的效果如图:
视频横竖屏切换最后效果.gif
以上就是关于 iOS16 横竖屏适配以及关于视频适配的全部内容
