iOS6的旋屏控制

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：

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- (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。

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-(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

[cpp] view
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- (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）

[cpp] view
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- (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：

[cpp] view
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- (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：

[cpp] view
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- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window

{

return UIInterfaceOrientationMaskPortrait;

}