iOS 的旋屏控制技巧

传送门：http://blog.csdn.net/yiyaaixuexi/article/details/8035014

IOS系统共定义了以下七种设备方向：
 

typedef NS_ENUM(NSInteger, UIDeviceOrientation) {    UIDeviceOrientationUnknown,    UIDeviceOrientationPortrait,            // Device oriented vertically, home button on the bottom    UIDeviceOrientationPortraitUpsideDown,  // Device oriented vertically, home button on the top    UIDeviceOrientationLandscapeLeft,       // Device oriented horizontally, home button on the right    UIDeviceOrientationLandscapeRight,      // Device oriented horizontally, home button on the left    UIDeviceOrientationFaceUp,              // Device oriented flat, face up    UIDeviceOrientationFaceDown             // Device oriented flat, face down};

 　　                      四种界面方向：

typedef NS_ENUM(NSInteger, UIInterfaceOrientation) {    UIInterfaceOrientationPortrait           = UIDeviceOrientationPortrait,    UIInterfaceOrientationPortraitUpsideDown = UIDeviceOrientationPortraitUpsideDown,    UIInterfaceOrientationLandscapeLeft      = UIDeviceOrientationLandscapeRight,    UIInterfaceOrientationLandscapeRight     = UIDeviceOrientationLandscapeLeft};

iOS6的旋屏控制技巧

在iOS5.1 和 之前的版本中， 我们通常利用 shouldAutorotateToInterfaceOrientation: 来单独控制某个UIViewController的旋屏方向支持，比如：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  {      return (interfaceOrientation == UIInterfaceOrientationPortrait);  }  

但是在iOS6中，这个方法被废弃了，使用无效。

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.)

实践后会发现，通过supportedInterfaceOrientations的单独控制是无法锁定屏幕的。

-(NSUInteger)supportedInterfaceOrientations  {      return UIInterfaceOrientationMaskPortrait;  }  

多次实验后总结出控制屏幕旋转支持方向的方法如下：

子类化UINavigationController，增加方法

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

并且设定其为程序入口，或指定为 self.window.rootViewController

随后添加自己的view controller，如果想禁止某个view controller的旋屏：（支持全部版本的控制）

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  {      return (interfaceOrientation == UIInterfaceOrientationPortrait);  }    -(BOOL)shouldAutorotate  {      return NO;  }    -(NSUInteger)supportedInterfaceOrientations  {      return UIInterfaceOrientationMaskPortrait;  }  

如果想又开启某个view controller的全部方向旋屏支持：

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  {      return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);  }    -(NSUInteger)supportedInterfaceOrientations  {      return UIInterfaceOrientationMaskAllButUpsideDown;  }    -(BOOL)shouldAutorotate  {      return YES;  }  

从而实现了对每个view controller的单独控制。

顺便提一下，如果整个应用所有view controller都不支持旋屏，那么干脆：

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window  {       return UIInterfaceOrientationMaskPortrait;  }