另一个segue结束时调用segue

Question

为什么当另一个segue结束时，不可能正确调用segue？我想我的代码必须是错的或无法调用？

- (IBAction)optionTapped
{
    if (greeting)
        {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Alerta!" message:@"something.." delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles:nil];
            [alert show];
            [self performSegueWithIdentifier:@"firstSegue" sender:itemToSent];
            greeting = NO;
        }
    else
        {
            [self performSegueWithIdentifier:@"anotherSegue" sender:nil];
        }
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if ([segue.identifier isEqualToString:@"anotherSegue"]) {
        UIViewController *viewController = segue.destinationViewController;
        OptionsViewController *controller = (OptionsViewController *)viewController;
        controller.delegate = self;
    } else if ([segue.identifier isEqualToString:@"firstSegue"]) {
        UINavigationController *navigationController = segue.destinationViewController;
        CCGetViewController *controller = (CCGetViewController *)navigationController.topViewController;
        controller.delegate = self;
        controller.itemToSent = sender;
    }

- (void)firstSegueViewController:(CCGetViewController *)controller didFinishAddItem:(InfoListItems *)item
{
    itemToSent = item;
    [self dismissViewControllerAnimated:YES completion:nil];
    if (scanTap) {
        [self scanTapped];
    } else if(infoTap){
        [self optionTapped];
    }
}

还有一件事：“firstSegue”将它嵌入到NavigationController中，“anotherSegue”只是一个视图控制器。

Answer 1

我试图不断地移动segue，但我也失败了。

所以我试着在第一个segue和第二个segue之间设置间隔一秒钟。

这很好用！当您在红色窗口中按下按钮时，会出现绿色窗口，然后会自动出现蓝色窗口。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    [self performSelector:@selector(segue) withObject:nil afterDelay:1.0];
}

- (void)segue
{
    [self performSegueWithIdentifier:@"toBlue" sender:self];
}

您可以下载示例项目并运行它：

https://github.com/weed/p120812_DoubleSegue