问题：
iOS 6 and Xcode 4.5 has a new feature referred to as "Unwind Segue": iOS 6和Xcode 4.5具有称为“ Unwind Segue”的新功能：
Unwind segues can allow transitioning to existing instances of scenes in a storyboard 放开序列可以允许过渡到情节提要中场景的现有实例
In addition to this brief entry in Xcode 4.5's release notes, UIViewController now seem to have a couple of new methods: 除了Xcode 4.5发行说明中的这一简短条目之外，UIViewController现在似乎还有一些新方法：
- (BOOL)canPerformUnwindSegueAction:(SEL)action fromViewController:(UIViewController *)fromViewController withSender:(id)sender
- (UIViewController *)viewControllerForUnwindSegueAction:(SEL)action fromViewController:(UIViewController *)fromViewController withSender:(id)sender
- (UIStoryboardSegue *)segueForUnwindingToViewController:(UIViewController *)toViewController fromViewController:(UIViewController *)fromViewController identifier:(NSString *)identifier
How do unwind segues work and what they can be used for? 放松搜寻的工作方式以及它们的用途是什么？
解决方案：
参考一： https://stackoom.com/question/qhsd/什么是Unwind-segues-您如何使用它们参考二： https://oldbug.net/q/qhsd/What-are-Unwind-segues-for-and-how-do-you-use-them
来源：oschina
链接：https://my.oschina.net/stackoom/blog/4406723