里脊串大神 --- 在开发过程中，有的页面需要横屏，有的不需要， 所以本文带来强制旋转屏幕

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//UINavigationController

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

- (NSUInteger)supportedInterfaceOrientations
{
return self.topViewController.supportedInterfaceOrientations;
}

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

//UITabbarViewController
//注意 这里的selectedViewController如果是UINavigationController的话 也需要对它做上面的修改
- (BOOL)shouldAutorotate
{
return self.selectedViewController.shouldAutorotate;
}

- (NSUInteger)supportedInterfaceOrientations
{
return self.selectedViewController.supportedInterfaceOrientations;
}

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

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UIViewController *vc = [[UIViewController alloc]init];
[self presentModalViewController:vc animated:NO];
[self dismissModalViewControllerAnimated:NO];

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UIViewController *vc  = [[UIViewController alloc] init];
[self presentViewController:viewController animated:NO completion:^{
[self dismissViewControllerAnimated:NO completion:nil];
}];

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[[UIDevice currentDevice] setValue:
[NSNumber numberWithInteger: self.isFullScreen?UIInterfaceOrientationLandscapeRight:UIInterfaceOrientationPortrait]
forKey:@"orientation"];

//等价于
objc_msgSend([UIDevice currentDevice], @selector(setOrientation:), self.isFullScreen?UIInterfaceOrientationLandscapeRight:UIInterfaceOrientationPortrait);