ios - [UITabBarController setPassedData :]: unrecognized selector sent to instance

Question

我将在下面给出程序的概要，但是，当插入一个新的 View Controller (不是标签栏 View )时，我在步进器上选择一个值，然后单击一个按钮返回。我正在尝试将步进值从 FilterViewController 发送到 FirstViewController。

该程序:

应用程序在 FirstViewController 上加载这是标签栏 Controller 的第一个标签，在屏幕的左上角是一个打开 FilterViewController 的按钮(放大镜)。

FilterViewController 有一个步进器、一个标签(显示步进器的值)和一个按钮。您单击按钮，它将步进器的值保存到一个变量中，我需要将它传递给 FirstViewController。

FirstViewController.h(从 FilterViewController 访问的属性)

@interface FirstViewController : UIViewController
{
    NSString *passedData;
}

@property(nonatomic, retain) NSString *passedData;

FirstViewController.m(推送新 View Controller 的代码，该属性也在实现中合成)

- (IBAction)searchOptions:(id)sender {
    FilterViewController *ctrl = [[FilterViewController alloc] init];
    [UIView transitionFromView:self.view toView:ctrl.view duration:1 options:UIViewAnimationOptionTransitionCurlUp completion:nil];

    self.filterViewController = ctrl;

    [self.navigationController pushViewController:self.filterViewController animated:NO];

}

FilterViewController.m(保存值并将其传递给 FirstViewController 的代码)

- (IBAction)backToMap:(id)sender {
    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
    FirstViewController *fvc = [storyboard instantiateViewControllerWithIdentifier:@"TabBarController"];
    fvc.modalTransitionStyle = UIModalTransitionStyleCoverVertical;

    self.firstViewData = fvc;

    fvc.passedData = @"yo";

    //firstViewData.passedData = @"hello test test test";

    [self presentViewController:fvc animated:YES completion:nil];
}

当它执行这个时它崩溃说: [UITabBarController setPassedData:]: unrecognized selector sent to instance

Answer 1

假设您的意思是崩溃发生在您的代码的以下行

    fvc.passedData = @"yo";

您可能想检查 fvc 确实是 FirstViewController NSLog("%@", fvc);即 IB 中的类是否从 UIViewController 更改为 FirstViewController ？