iOS 设置随意屏幕旋转

方法一，通过控制器继承或分类实现：

在UITabBarController 的子类或分类中实现

 - (BOOL)shouldAutorotate {
     return [self.selectedViewController shouldAutorotate];
 }

 - (UIInterfaceOrientationMask)supportedInterfaceOrientations {
     return [self.selectedViewController supportedInterfaceOrientations];
 }

 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
     return [self.selectedViewController preferredInterfaceOrientationForPresentation];
 }

在UINavigationController 的子类或分类中实现

 - (BOOL)shouldAutorotate {
     return [self.topViewController shouldAutorotate];
 }

 - (UIInterfaceOrientationMask)supportedInterfaceOrientations {
     return [self.topViewController supportedInterfaceOrientations];
 }

 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
     return [self.topViewController preferredInterfaceOrientationForPresentation];
 }

在 UIViewController 的子类或分类中实现

 - (BOOL)shouldAutorotate {
     // 是否允许转屏
     return NO;
 }

 - (UIInterfaceOrientationMask)supportedInterfaceOrientations {
     // 所支持的全部旋转方向
     return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
 }

 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
     // 初始显示的方向
     return UIInterfaceOrientationPortrait;
 }

最后在需要改变方向的控制器中重写以下方法实现可旋转功能

 - (BOOL)shouldAutorotate {
     // 是否允许转屏
     return YES;
 }

 - (UIInterfaceOrientationMask)supportedInterfaceOrientations {
     // 所支持的全部旋转方向
     return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
 }

 - (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
     // 初始显示的方向
     return UIInterfaceOrientationPortrait;
 }

亲测可用

方法二：通过AppDelegate代理方法实现

 - (UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window {

     if ([[self topViewController] isKindOfClass:[MyInterfaceController class]]) {
         return UIInterfaceOrientationMaskAllButUpsideDown;
     }
     return UIInterfaceOrientationMaskPortrait;//竖屏
 }

 // 获取当前window的顶层控制器
 - (UIViewController *)topViewController {
     UIViewController *resultVC;
     resultVC = [self _topViewController:[[UIApplication sharedApplication].keyWindow rootViewController]];
     while (resultVC.presentedViewController) {
         resultVC = [self _topViewController:resultVC.presentedViewController];
     }
     return resultVC;
 }

 - (UIViewController *)_topViewController:(UIViewController *)vc {
     if ([vc isKindOfClass:[UINavigationController class]]) {
         return [self _topViewController:[(UINavigationController *)vc topViewController]];
     } else if ([vc isKindOfClass:[UITabBarController class]]) {
         return [self _topViewController:[(UITabBarController *)vc selectedViewController]];
     } else {
         return vc;
     }
     return nil;
 }

MyInterfaceController 为需要改变旋转方式的控制器

当从旋转过的屏幕返回不需要旋转的控制器时，需要强制旋转为指定方向，

- (void)viewWillAppear:(BOOL)animated 中调用：

 // 强制旋转屏幕
 - (void)interfaceOrientation:(UIInterfaceOrientation)orientation
 {
     SEL selector  = NSSelectorFromString(@"setOrientation:");
     if ([[UIDevice currentDevice] respondsToSelector:selector]) {
         // NSInvocation中保存了方法所属的对象/方法名称/参数/返回值
         // 其实NSInvocation就是将一个方法变成一个对象
         // 1.创建NSInvocation对象,设置方法签名
         NSInvocation *invocation = [NSInvocation invocationWithMethodSignature:[UIDevice instanceMethodSignatureForSelector:selector]];
         // 2.设置方法调用者
         [invocation setTarget:[UIDevice currentDevice]];
         // 3.写入签名方法
         [invocation setSelector:selector];
         // 4.设置参数
         int val = orientation;
         [invocation setArgument:&val atIndex:]; // 设置索引2或更大(如果签名方法再有一个参数测设置3来进行索引传递); 0，1参数为target和selector
         // 开始执行
         [invocation invoke];
     }
 }

完毕 ，亲测可用