使用预构建的 UITabBarController 将数据发送到另一个视图？

发布于 2024-10-06 04:51:45 字数 721 浏览 3 评论 0原文

我使用 Xcode 创建了一个选项卡栏应用程序作为两个视图。

第二个视图是 UITableViewController。

我正在努力做的是当按下第二个选项卡时将数据发送到该视图。我已将选项卡栏委托给我的 AppDelegate 类并实现了此功能：

-(void)tabBarController:(UITabBarController*)tabBarController didSelectViewController:(UIViewController*)viewController
{
    // Override point for customization after application launch.
    statisticsViewController* assignmentListcont = [statisticsViewController alloc];

    NSManagedObjectContext* context = [self managedObjectContext];

    assignmentListcont.managedObjectContext = context;

    [assignmentListcont release];

}

第二个视图显示正常，但数据尚未传递。我想这是因为我还没有编写第二个视图转换，但如果我已经有一个 .xib 文件为我做这件事，我不确定如何做到这一点？有没有什么方法可以毫无问题地传递数据，甚至在视图内部检索数据？

原文

I have created a Tab Bar Application using Xcode that as two views.

The secound view is a UITableViewController.

What I am struggling to do is send data to this view, when the second tab is pressed. I have delegated the Tab Bar to my AppDelegate class and implemented this function:

-(void)tabBarController:(UITabBarController*)tabBarController didSelectViewController:(UIViewController*)viewController
{
    // Override point for customization after application launch.
    statisticsViewController* assignmentListcont = [statisticsViewController alloc];

    NSManagedObjectContext* context = [self managedObjectContext];

    assignmentListcont.managedObjectContext = context;

    [assignmentListcont release];

}

The second view is displaying fine but the data hasn't been passed. I imagine its because I haven't programmed the second views transition but I'm unsure of how to do this if I already have a .xib file doing it for me? Is there some way to just pass the data without problems or even retrieve the data once inside the view?

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°如果伤别离去 2024-10-13 04:51:45

您可以使用通知。

在您想要接收数据的视图中，将其放入 viewDidLoad 中：

[[NSNotificationCenter defaultCenter] addObserver:self 
                                      selector:@selector(yourSelector:) 
                                      name:@"addedData" 
                                      object:nil];

然后实现接收该数据的方法：

- (void)yourSelector:(NSNotification *)notification {
         Foo *foo;
     foo = [notification object];
    //do something else
}

现在，在数据源自的类中，您发布一条通知，通知新数据被创建。此外，您还可以传递希望其他方法接收的数据。

[[NSNotificationCenter defaultCenter] postNotificationName:@"addedData" 
                                      object:foo];

You could use notifications.

In the view that you want to receive the data, put this in viewDidLoad:

[[NSNotificationCenter defaultCenter] addObserver:self 
                                      selector:@selector(yourSelector:) 
                                      name:@"addedData" 
                                      object:nil];

Then implement the method that receives that data:

- (void)yourSelector:(NSNotification *)notification {
         Foo *foo;
     foo = [notification object];
    //do something else
}

Now in the class where the data is originated from, you post a notification that new data was created. Also, you pass along the data that you want to have the other method receive.

[[NSNotificationCenter defaultCenter] postNotificationName:@"addedData" 
                                      object:foo];

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迷离° 2024-10-13 04:51:45

我这样做是为了将值从一个视图控制器发送到另一个视图控制器，希望它有帮助

UITabBarViewController *var = [self.storyboard   instantiateViewControllerWithIdentifier:@"name"]; //I select the UITabBarController
otherViewController *var2 = [var.childViewControllers objectAtIndex:0]; //I Select the first ViewController from that UITabBarController
var2.variable = @"value";
[self.navigationController pushViewController:var animated:YES];

I've done this to send a value from one view controller to another, hope it helps

UITabBarViewController *var = [self.storyboard   instantiateViewControllerWithIdentifier:@"name"]; //I select the UITabBarController
otherViewController *var2 = [var.childViewControllers objectAtIndex:0]; //I Select the first ViewController from that UITabBarController
var2.variable = @"value";
[self.navigationController pushViewController:var animated:YES];

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