【iOS】ios6.0 UINavigationController支持屏幕自动旋转

问题描述：

当从页面A跳转到页面B时，使用的是UINavigationController的presentViewController:animated:completion:方法。如果页面A是纵向UI，而页面B则在xib配置中是横向UI，不论在B的viewController实现文件中如何设置，从A到B跳转后，B为纵向显示，无法受其控制。

 

原因：

猜测是因为presentViewController:animated:completion:时，旋转控制权在parentViewController上，B页面无法拿到控制权。

 

解决方案：

重写UINavigationController的旋转方法，使viewController能够拿到旋转权。

代码如下：

UINavigationController+Rotation_IOS6.h

@interface UINavigationController (Rotation_IOS6)

-(BOOL)shouldAutorotate;
-(NSUInteger)supportedInterfaceOrientations;
-(UIInterfaceOrientation)preferredInterfaceOrientationForPresentation;

@end

UINavigationController+Rotation_IOS6.m

@implementation UINavigationController (Rotation_IOS6)
-(BOOL)shouldAutorotate {
return [[self.viewControllers lastObject] shouldAutorotate];
}

-(NSUInteger)supportedInterfaceOrientations {
return [[self.viewControllers lastObject] supportedInterfaceOrientations];
}

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation {
return [[self.viewControllers lastObject] preferredInterfaceOrientationForPresentation];
}
@end

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