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添加了一个方法和协议，在完成文本编辑后将 addItemViewController:didFinishEditingItem 方法传递给主视图控制器 (ChecklistsViewController)。（编辑命令和 segue 是通过按下清单主页上的披露详细信息按钮来调用的。）

问题是在完成编辑并按下“完成”按钮后，没有完成的文本编辑被传递回原始清单页面，这意味着原始编辑没有被传递。我没有编译警告消息。

你能告诉我出了什么问题，为什么没有完成的编辑被传回清单吗？提前致谢。

AddItemViewController.h

进口

@class AddItemViewController;
@class ChecklistItem;

@protocol AddItemViewControllerDelegate <NSObject>

- (void)addItemViewControllerDidCancel:(AddItemViewController *)controller;

- (void)addItemViewController:(AddItemViewController *)controller didFinishAddingItem:(ChecklistItem *)item;

- (void)addItemViewController:(AddItemViewController *)controller didFinishEditingItem:(ChecklistItem *)item;



@end

@interface AddItemViewController : UITableViewController <UITextFieldDelegate>

@property (strong, nonatomic) IBOutlet UITextField *textField;
@property (strong, nonatomic) IBOutlet UIBarButtonItem *doneBarButton;
@property (nonatomic, weak) id <AddItemViewControllerDelegate> delegate;
@property (nonatomic, strong) ChecklistItem *itemToEdit;

- (IBAction)cancel;
- (IBAction)done;

@end

AddItemViewController.m

#import "AddItemViewController.h"
#import "ChecklistItem.h"

@interface AddItemViewController ()

@end


@implementation AddItemViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    if(self.itemToEdit != nil) {
        self.title = @"Edit Item";
        self.textField.text = self.itemToEdit.text;
        self.doneBarButton.enabled = YES;
    }
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (IBAction)cancel
{
    [self.delegate addItemViewControllerDidCancel:self];
}

- (IBAction)done
{
    if(self.itemToEdit == nil) {
    ChecklistItem *item = [[ChecklistItem alloc] init];
    item.text = self.textField.text;
    item.checked = NO;

    [self.delegate addItemViewController:self didFinishAddingItem:item];
    } else {
    self.itemToEdit.text = self.textField.text;
    [self.delegate addItemViewController:self didFinishEditingItem:self.itemToEdit];
    }
}

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    return nil;
}
- (void)viewDidUnload {
    [self setTextField:nil];
    [self setDoneBarButton:nil];
    [super viewDidUnload];
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    [self.textField becomeFirstResponder];
}

- (BOOL)textField:(UITextField *)theTextField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSString *newText = [theTextField.text stringByReplacingCharactersInRange:range withString:string];

    self.doneBarButton.enabled = ([newText length] > 0);

    return YES;
}
@end

清单ViewController.h

#import <UIKit/UIKit.h>
#import "AddItemViewController.h"

@interface ChecklistsViewController : UITableViewController <AddItemViewControllerDelegate>



@end

清单ViewController.m

#import "ChecklistsViewController.h"
#import "ChecklistItem.h"

@interface ChecklistsViewController ()

@end

@implementation ChecklistsViewController {
    NSMutableArray *items;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    items = [[NSMutableArray alloc] initWithCapacity:20];

    ChecklistItem *item;

    item = [[ChecklistItem alloc]init];
    item.text = @"Walk the dog";
    item.checked = NO;
    [items addObject:item];

    item = [[ChecklistItem alloc]init];
    item.text = @"Brush my teeth";
    item.checked = YES;
    [items addObject:item];

    item = [[ChecklistItem alloc]init];
    item.text = @"Learn iOS development";
    item.checked = YES;
    [items addObject:item];

    item = [[ChecklistItem alloc]init];
    item.text = @"Soccer practice";
    item.checked = NO;
    [items addObject:item];

    item = [[ChecklistItem alloc]init];
    item.text = @"Eat ice cream";
    item.checked = YES;
    [items addObject:item];
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [items count];
}

- (void)configureCheckmarkForCell:(UITableViewCell *)cell withChecklistItem:(ChecklistItem *)item
{
    UILabel *label = (UILabel *)[cell viewWithTag:1001];
    if(item.checked) {
        label.text =@"√";
    } else {
        label.text = @"";
    }

}

- (void)configureTextForCell:(UITableViewCell *)cell withChecklistItem:(ChecklistItem *)item
{
    UILabel *label = (UILabel *)[cell viewWithTag:1000];
    label.text = item.text;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"ChecklistItem"];

    ChecklistItem *item = [items objectAtIndex:indexPath.row];

    [self configureTextForCell:cell withChecklistItem:item];
    [self configureCheckmarkForCell:cell withChecklistItem:item];

    return cell;
}

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath
{
    ChecklistItem *item = [items objectAtIndex:indexPath.row];
    [self performSegueWithIdentifier:@"EditItem" sender:item];
}

- (void)tableView:(UITableView *)tableView didDeselectRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView cellForRowAtIndexPath:indexPath];

    ChecklistItem *item = [items objectAtIndex:indexPath.row];
    [item toggleChecked];


    [self configureCheckmarkForCell:cell withChecklistItem:item];

    [tableView deselectRowAtIndexPath:indexPath animated:YES];
}



- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    [items removeObjectAtIndex:indexPath.row];

    NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
    [tableView deleteRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];
}

- (void)addItemViewControllerDidCancel:(AddItemViewController *)controller
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)addItemViewController:(AddItemViewController *)controller didFinishAddingItem:(ChecklistItem *)item
{
    int newRowIndex = [items count];
    [items addObject:item];

    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:newRowIndex inSection:0];
    NSArray *indexPaths = [NSArray arrayWithObject:indexPath];
    [self.tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationAutomatic];

    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)addItemViewController:(AddItemViewController *)controller didFinishEditingItem:(ChecklistItem *)item
{
    int index = [items indexOfObject:item];
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];
    UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];
    [self configureCheckmarkForCell:cell withChecklistItem:item];

    [self dismissViewControllerAnimated:YES completion:nil];
}

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([segue.identifier isEqualToString:@"AddItem"]) {
        UINavigationController *navigationController = segue.destinationViewController;
        AddItemViewController *controller = (AddItemViewController *)navigationController.topViewController;
        controller.delegate = self;
    } else if ([segue.identifier isEqualToString:@"EditItem"]) {
        UINavigationController *navigationController = segue.destinationViewController;
        AddItemViewController *controller = (AddItemViewController *)navigationController.topViewController;
        controller.delegate = self;
        controller.itemToEdit = sender;
    }
}

@end
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