所以现在我可以更好地了解你是什么之后我可以给你一个更彻底的答案。您真正要寻找的是与委托和协议相关的模式。这是一种在 viewController 之间发送数据的方法，无需了解父（或委托）控制器的任何真实细节。这就是你想要做的。
为了清楚起见，我将为您的控制器使用两个名称，mainViewController 用于您的根控制器，tableViewController 用于您的 UITableViewController 子类的实例。
在.h。你的tableViewController 你会想要设置一个协议：
@protocol SingleSelectionDelegate
- (void)selectionHasBeenChosenWithOption:(NSString *)selection;
@end
@interface MyTableViewControllerSubclass : UITableViewController
// properties and method declarations
// this is your property you will use to send data back to your delegate (in this case your mainViewController)
@property (weak, nonatomic) id<SingleSelectionDelegate> selectionDelegate;
@end
然后在mainViewController 的.m（或.h）中，您需要添加以下内容：
// this imports the interface and also the protocol that you want
#import "MyTableViewControllerSubclass.h"
// the <Single...> part says you conform to this protocol and implement the methods it requires (in this case selectionHasBeenChosenWithOption:)
@interface MainViewController <SingleSelectionDelegate>
@end
@implementation MainViewController
// here is where you need to implement the required method
- (void)selectionHasBeenChosenWithOption:(NSString *)selection {
// do what you want with the selection, assign it to a property, call other methods, pass it to other delegates, or whatever else.
// now that you have your information you want the focus to come back to you so you
[self.navigationController popToViewController:self animated:YES]; // works even if not the root
}
// you also need to set yourself as tableViewController's selectionDelegate, if you are using Storyboards you will do this in the prepareForSegue.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.destinationViewController isKindOfClass:[MyTableViewControllerSubclass class]]) {
// you could also check a specific segue's identifier but this makes sense because if it is this subclass then it will have a selectionDelegate property
// assign yourself as the delegate
MyTableViewControllerSubclass *destination = (MyTableViewControllerSubclass *)segue.destinationViewController
destination.selectionDelegate = self;
}
@end
最后一步是在您获得 selectionDelegate 的信息时调用委托方法。这是在您的tableViewController 的.m 中完成的。在这种情况下，我会在tableView:didSelectRowAtIndexPath:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// getting the data you want to send back
NSString dataToSendBack = [self.myArray[indexPath.row] description];
// sending the data to your delegate (in this case mainViewController)
[self.selectionDelegate selectionHasBeenChosenWithOption:dataToSendBack];
// mainViewController is handling the popping so we do not need to do anything with the navigation stack
}
所以这基本上就是你所追求的。我在这里的文本编辑器中输入了几乎所有这些内容，因此可能存在一些语法错误。让我知道，我可以修复它们。这是 iOS 开发的一个重要概念，因为您最终会在所有地方使用它。学好它，你也可以寻找一些其他的教程。就像我说的，你会发现很多！我记得当我第一次学习它时，我自己感到不知所措，但现在它只是第二天性。