iOS 6和Xcode 4.5有一项称为"Unwind Segue"的新功能:
展开segue可以允许转换到故事板中的现有场景实例
除了Xcode 4.5发行说明中的这个简短条目之外,UIViewController现在似乎有几个新方法:
- (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
展开segue如何工作以及它们可以用于什么？