iOS 強制橫屏

在iOS5.1 和 以前的版本中， 咱們一般利用 shouldAutorotateToInterfaceOrientation: 來單獨控制某個UIViewController的旋屏方向支持，好比：
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  
{  
   return (interfaceOrientation == UIInterfaceOrientationPortrait);  
}  

可是在iOS6中，這個方法被廢棄了，使用無效。
shouldAutorotateToInterfaceOrientation:
Returns a Boolean value indicating whether the view controller supports the specified orientation. (Deprecated in iOS 6.0. Override the supportedInterfaceOrientations andpreferredInterfaceOrientationForPresentation methods instead.)

實踐後會發現，經過supportedInterfaceOrientations的單獨控制是沒法鎖定屏幕的。
-(NSUInteger)supportedInterfaceOrientations  
{  
   return UIInterfaceOrientationMaskPortrait;  
} 

屢次實驗後總結出控制屏幕旋轉支持方向的方法以下：
子類化UINavigationController，增長方法
- (BOOL)shouldAutorotate  
{  
   return self.topViewController.shouldAutorotate;  
}
- (NSUInteger)supportedInterfaceOrientations  
{  
   return self.topViewController.supportedInterfaceOrientations;  
}  

而且設定其爲程序入口，或指定爲 self.window.rootViewController
隨後添加本身的view controller，若是想禁止某個view controller的旋屏：（支持所有版本的控制）
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  
{  
   return (interfaceOrientation == UIInterfaceOrientationPortrait);  
} 
-(BOOL)shouldAutorotate  
{  
   return NO;  
}  

-(NSUInteger)supportedInterfaceOrientations  
{  
   return UIInterfaceOrientationMaskPortrait;  
} 

若是想又開啓某個view controller的所有方向旋屏支持：
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  
{  
   return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);  
} 
-(NSUInteger)supportedInterfaceOrientations  
{  
   return UIInterfaceOrientationMaskAllButUpsideDown;  
} 
-(BOOL)shouldAutorotate  
{  
   return YES;  
} 

從而實現了對每一個view controller的單獨控制。
順便提一下，若是整個應用全部view controller都不支持旋屏，那麼幹脆：
- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window  
{  
    return UIInterfaceOrientationMaskPortrait;  
}

此外 若是若是但願在進入某個ViewController時就是橫屏 那麼你能夠在

 - (void)viewWillAppear:(BOOL)animated

{

   [superviewWillAppear:animated];

CGFloat duration = [UIApplicationsharedApplication].statusBarOrientationAnimationDuration;

   [UIViewbeginAnimations:nilcontext:nil];

   [UIViewsetAnimationDuration:duration];

self.navigationController.view.transform = CGAffineTransformIdentity;

self.navigationController.view.transform = CGAffineTransformMakeRotation(M_PI*(90)/180.0);

self.navigationController.view.bounds = CGRectMake(0, 0, 1024, 768);

   [UIViewcommitAnimations];

   [[UIApplicationsharedApplication] setStatusBarOrientation: UIInterfaceOrientationLandscapeRightanimated:YES];

}

轉載：http://zqlswt1314.blog.51cto.com/3014999/1282672