iOS 横屏、转屏网址

最简单的方法：

[[UIDevice currentDevice] setValue:[NSNumber numberWithInteger:UIInterfaceOrientationLandscapeRight] forKey:@"orientation"];

这篇帖子区分了三种情况：包含nav，包含tabBar，自身为单独的viewcontroller。http://www.jianshu.com/p/650ba0ff626b
http://www.jianshu.com/p/4a51a2edf270（含图）
http://www.jianshu.com/p/5f5d46e674a7
http://blog.youkuaiyun.com/shly1988/article/details/46776691
http://www.jianshu.com/p/d8018006f0b5
http://blog.youkuaiyun.com/zhenyu5211314/article/details/24003809