iOS6中旋转的略微改变

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation //已经相当弱化

- (NSUInteger)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window
//新增Api，与info.plist设备支持旋转方向神似（区别在于default.png）且注意与UIInterfaceOrientation不同的是这的NSUInteger返回值为UIInterfaceOrientationMaskPortrait|...等

//iOS6新增Api来控制旋转，需要注意的是顶层才是有效的
- (BOOL)shouldAutorotate
{
    return NO;
}
-(NSUInteger)supportedInterfaceOrientations
{
    return UIInterfaceOrientationMaskPortrait;
}

//习惯使用的presentModalViewController navigation controller在旋转上已经出现了大问题，可用category解决
@implementation UINavigationController (autorotate)
- (NSUInteger)supportedInterfaceOrientations{

    NSArray *arr = self.viewControllers;
    if ([arr count] == 0) {
        return UIInterfaceOrientationMaskPortrait;
    }
    id vc = [arr objectAtIndex:0];
    if ([vc isKindOfClass:[TestNoRotation class]]) {
        return UIInterfaceOrientationMaskPortrait;

    }

    if ([vc isKindOfClass:[TestAutoRotation class]]) {
        return UIInterfaceOrientationMaskPortrait | UIInterfaceOrientationMaskPortraitUpsideDown | UIInterfaceOrientationMaskLandscapeLeft | UIInterfaceOrientationMaskLandscapeRight;
    }

    return UIInterfaceOrientationMaskPortrait;
}
@end