ios6以上版本的旋转控制

1.若整个程序没有NavigationController可以直接使用以下这两方法来控制
-(BOOL)shouldAutorotate；

-(NSUInteger)supportedInterfaceOrientations;
2.若整个程序有NavigationController，则应对Nav写个类别，然后再在单个Controller里控制
Nav类别的写法：

@implementation UINavigationController (Rotation_IOS6)

-(BOOL)shouldAutorotate
{
    return [self.topViewController shouldAutorotate];
}

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

- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation
{
    return [self.topViewController preferredInterfaceOrientationForPresentation];
}

@end

方法源参考：http://stackoverflow.com/questions/12803762/ios6-interface-orientation-broken