iOS6的旋屏控制技巧

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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;}



下次再说说iOS6的内存控制吧


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