presentViewController在iOS 6中不支持方向

I am using this code

我正在使用此代码

if ([self respondsToSelector:@selector(presentViewController:animated:completion:)])
    {
        [self presentViewController:navigationControllerCustom animated:YES completion:nil];
    }
    else
    {
        [self presentModalViewController:navigationControllerCustom animated:YES];
    }
if ([self res