如何以编程方式执行Unwind segue？

最新推荐文章于 2025-12-03 13:11:09 发布

翻译最新推荐文章于 2025-12-03 13:11:09 发布 · 222 阅读

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原文链接：https://oldbug.net/q/qUGs/How-to-perform-Unwind-segue-programmatically

文章标签：

#ios #segue #ios6

本文介绍如何在iOS应用中以编程方式执行UnwindSegue。通过创建手动Segue，并在ViewController的viewDidAppear方法中调用performSegueWithIdentifier，可以实现从当前视图控制器返回到前一个视图控制器的功能。

本文翻译自：How to perform Unwind segue programmatically?

Using storyboard this is very easy. 使用情节提要非常简单。 You just drag the action to "Exit". 您只需将动作拖到“退出”即可。 But how should I call it from my code? 但是如何从代码中调用它呢？

#1楼

参考：https://stackoom.com/question/qUGs/如何以编程方式执行Unwind-segue

#2楼

Create a manual segue ( ctrl -drag from File's Owner to Exit), 创建一个手动序列（从文件所有者的ctrl -drag拖动到Exit），
Choose it in the Left Controller Menu below green EXIT button. 在绿色EXIT按钮下方的左侧控制器菜单中选择它。

在绿色EXIT按钮下方的左侧控制器菜单中选择它

Insert Name of Segue to unwind. 插入“名称”以展开。

Then, - (void)performSegueWithIdentifier:(NSString *)identifier sender:(id)sender. 然后， - (void)performSegueWithIdentifier:(NSString *)identifier sender:(id)sender. with your segue identify. 与您的segue标识。

#3楼

I used [self dismissViewControllerAnimated: YES completion: nil]; 我用了[self dismissViewControllerAnimated: YES completion: nil]; which will return you to the calling ViewController . 这将使您返回到调用ViewController 。

#4楼

FYI: In order for @Vadim's answer to work with a manual unwind seque action called from within a View Controller you must place the command: 仅供参考：为了使@Vadim的答案与在View Controller中调用的手动展开固定动作配合使用，必须放置以下命令：

[self performSegueWithIdentifier:(NSString*) identifier sender:(id) sender];

inside of the overriden class method viewDidAppear like so: 在覆盖的类方法viewDidAppear中，如下所示：

-(void) viewDidAppear:(BOOL) animated
{
    [super viewDidAppear: animated];

    [self performSegueWithIdentifier:@"SomeSegueIdentifier" sender:self];
}

If you put it in other ViewController methods like viewDidLoad or viewWillAppear it will be ignored. 如果将其放在其他ViewController方法（如viewDidLoad或viewWillAppear）中 ，它将被忽略。

#5楼

Quoting text from Apple's Technical Note on Unwind Segue: To add an unwind segue that will only be triggered programmatically, control+drag from the scene's view controller icon to its exit icon, then select an unwind action for the new segue from the popup menu. 引用Apple的Unwind Segue技术注释中的文本：要添加只能以编程方式触发的Unwind Segue，请按住Control键并将其从场景的视图控制器图标拖到其退出图标，然后从弹出菜单中为新的Segue选择一个Unwind操作。

Link to Technical Note 链接到技术说明

#6楼

Backwards compatible solution that will work for versions prior to ios6, for those interested: 向后兼容的解决方案将对那些感兴趣的人适用于ios6之前的版本：

- (void)unwindToViewControllerOfClass:(Class)vcClass animated:(BOOL)animated {

    for (int i=self.navigationController.viewControllers.count - 1; i >= 0; i--) {
        UIViewController *vc = [self.navigationController.viewControllers objectAtIndex:i];
        if ([vc isKindOfClass:vcClass]) {
            [self.navigationController popToViewController:vc animated:animated];
            return;
        }
    }
}