xcode 以编程方式展开转场
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xcode unwind segue programmatically
提问by dan
How can we do a push xcode unwind segue programmatically?
我们如何以编程方式执行 push xcode unwind segue？
I know the simple way is to use the storyboard and pull the button to the 'exit', but what I intend to do is to have some codes run first before the view is exited.
我知道简单的方法是使用情节提要并将按钮拉到“退出”，但我打算做的是在退出视图之前先运行一些代码。
回答by Alexander of Norway
To go back to the rootViewController use:
要返回 rootViewController 使用：
[self.navigationController popToRootViewControllerAnimated:(BOOL)]
Or to go to a specific controller:
或者转到特定的控制器：
[self.navigationController popToViewController:
[[self.navigationController viewControllers]
objectAtIndex:THEINDEXOFTHEVIEWCONTROLLERTOUNWINDTO]
animated:YES];
For a little more detail, see my answer in this post: Push to root View controller in UIStoryboard
有关更多详细信息，请参阅我在这篇文章中的回答： 在 UIStoryboard 中推送到根视图控制器
回答by Alladinian
If you just want to execute some code before the exit (although keep it simple otherwise you'll get a UI lock until you return something), you could override canPerformUnwindSegueAction:fromViewController:withSender:on your destination controller.
如果您只想在退出之前执行一些代码（尽管保持简单，否则您将获得 UI 锁定，直到您返回某些内容），您可以覆盖canPerformUnwindSegueAction:fromViewController:withSender:目标控制器。
Something like this perhaps:
可能是这样的：
- (BOOL)canPerformUnwindSegueAction:(SEL)action
fromViewController:(UIViewController *)fromViewController
withSender:(id)sender
{
// Some operation...
return YES; // Or NO if something went wrong and you want to abort
}
Otherwise, you could actually create the segue programmatically and manage animation/unwind logic by overriding segueForUnwindingToViewController:fromViewController:identifier:.
否则，您实际上可以以编程方式创建 segue 并通过覆盖segueForUnwindingToViewController:fromViewController:identifier:.
You can find the complete documentation here
回答by rpledge
You can have a segue occur in code by calling this method in UIViewController
通过在 UIViewController 中调用此方法，您可以在代码中发生 segue
- (void)performSegueWithIdentifier:(NSString *)identifier sender:(id)sender
You'll still create the segue in your storyboard between the 2 views, just make sure you name the segue and use the exact name in the identifier parameter
您仍将在故事板中的 2 个视图之间创建转场，只需确保为转场命名并在标识符参数中使用确切名称
