如何传回数据 [英] How to Pass Data Back

问题描述

这是我的故事板的场景.

This is the scene of my storyboard.

UINavigationController -> UITableViewController -> push segue -> UIViewController

UINavigationController -> UITableViewController -> push segue -> UIViewController

我知道如何将UITableViewController 的数据传递给UIViewController.但是，如何将数据传回 UITableViewController?(UIViewController 有一个带有后退按钮的导航栏)

I know how to pass the data of UITableViewController to UIViewController. But, how can I pass the data back to the UITableViewController?(UIViewController has a navigation bar with a back button)

推荐答案

您可以通过使用委托来完成.

You can do it through the use of delegation.

当您将UITableViewController 的数据传递给UIViewController 时，您可以在UIViewController 上设置一个委托.每当你想将数据传回UITableViewController时，你可以调用delegate并传入数据

When you pass data of UITableViewController to UIViewController, you can set a delegate on UIViewController. Whenever you want to pass data back to UITableViewController, you can call the delegate and pass in the data

这是一个更具体的代码示例

Here's a more concrete example in code

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    // Make sure your segue name in storyboard is the same as this line
    if ([[segue identifier] isEqualToString:@"YOUR_SEGUE_NAME_HERE"])
    {
        // Get reference to the destination view controller
        UIViewController *vc = [segue destinationViewController];

        // Pass the UITableViewController to the UIViewController
        [vc setDelegate:self];
    }
}

在 UITableViewController 上创建一个从 UIViewController 获取数据的方法(示例:-(void)processDataFromUIViewController:(NSString *)string)

Create a method on UITableViewController that takes data from UIViewController (example: -(void)processDataFromUIViewController:(NSString *)string)

现在当你想把数据传回UITableViewController时，调用[delegate sendDataFromUIViewController:@"data"]

Now when you want to pass data back to UITableViewController, call [delegate sendDataFromUIViewController:@"data"]

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