ios - 找不到我的方法定义，但我不确定为什么

Question

我有一个带标签浏览的 Storyboard。其中一个选项卡是表格 View 。该表由动物“标题”列表填充。当按下标题时，会打开一个详细 View ，显示标题以及声音和动物被点击的次数。我设置了一个 View Controller 。我还有 item.h/m 和 itemstore.h/m。还有一个详细的 View Controller 。我目前的问题是，在项目商店中我设置了两个数组，但马上 xcode 告诉我找不到方法定义。它也给我未声明的标识符错误。

FSAnimalsViewController.h(这是我的 TableView Controller )

#import <AVFoundation/AVAudioPlayer.h>
#import <UIKit/UIKit.h>
#import "FSDetailViewController.h"

@interface FSAnimalsViewController : UITableViewController
{
}
@end

FSAnimalsViewController.m

#import "FSAnimalsViewController.h"
#import "FSItemStore.h"
#import "FSItem.h"

@implementation FSAnimalsViewController
- (id)init
{
    // Call the superclass's designated initializer
    self = [super initWithStyle:UITableViewStyleGrouped];
    if (self)
    {
        UINavigationItem *n = [self navigationItem];

        [n setTitle:@"FoxSays"];

        // Create a new bar button item that will send
        // addNewItem: to ItemsViewController

        [[self navigationItem] setLeftBarButtonItem:[self editButtonItem]];

    }
    return self;
}

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [[self tableView] reloadData];
}


- (id)initWithStyle:(UITableViewStyle)style
{
    return [self init];
}


- (void)tableView:(UITableView *)aTableView
didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    FSDetailViewController *detailViewController = [[FSDetailViewController alloc] init];

    NSArray *items = [[FSItemStore defaultStore] allItems];
    FSItem *selectedItem = [items objectAtIndex:[indexPath row]];

    // Give detail view controller a pointer to the item object in row
    [detailViewController setItem:selectedItem];

    // Push it onto the top of the navigation controller's stack
    [[self navigationController] pushViewController:detailViewController
                                           animated:YES];
}


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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Set the cell identifier
    static NSString *CellIdentifier = @"BasicCell";

    // Reuse the cell from the identifier
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];

    // Configure the cell if it doesn't exist
    if (!cell)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    // Log the row for debugging
    NSLog(@"%d", [indexPath row]);

    // Get object from store
    FSItem *item = [[[FSItemStore defaultStore] allItems] objectAtIndex:[indexPath row]];

    // Set label to from property in object
    [[cell textLabel] setText:[item title]];

    return cell;
}


@end

FSItem.h

#import <Foundation/Foundation.h>
#import <AudioToolbox/AudioToolbox.h>
#import <AVFoundation/AVAudioPlayer.h>

@interface FSItem : NSObject

@property (nonatomic, copy) NSString *title;
@property (nonatomic) SystemSoundID *sound;
@property (nonatomic) int plays;


- (NSArray *)animals;
- (NSArray *)sounds;

@end

FSItem.m

#import <AudioToolbox/AudioToolbox.h>
#import "FSItem.h"

@implementation FSItem

NSString *title;
SystemSoundID *sound;
int plays;

- (NSArray *)animals
{
    NSArray *animals = [NSArray arrayWithObjects:@"Dog",@"Cat",@"Bird",@"Mouse",@"Cow",@"Frog",@"Elephant",@"Duck",@"Fish",@"Seal",@"Fox", nil];

    return animals;
}

- (NSArray *)sounds
{
    NSArray *sounds = [NSArray arrayWithObjects:
                       @"Woof.mp3",
                       @"Meow.mp3",
                       @"tweet.mp3",
                       @"Squeak.mp3",
                       @"Moo.mp3",
                       @"Croak.mp3",
                       @"Toot.mp3",
                       @"Quack.mp3",
                       @"Blub.mp3",
                       @"OWOwOw.mp3",
                       @"Fox.mp3",
                       nil];

    return sounds;
}

@end

FSItemStore.h

#import <AVFoundation/AVAudioPlayer.h>
#import <AudioToolbox/AudioToolbox.h>
#import <Foundation/Foundation.h>
@class FSItem;


@interface FSItemStore : NSObject
{
    NSMutableArray *allItems;
}

@property (nonatomic) int i;





+ (FSItemStore *)defaultStore;


- (NSArray *)allItems;
- (NSArray *)animals;
- (NSArray *)sounds;
- (FSItem *)createItem;


@end

FSItemStore.m

#import <AudioToolbox/AudioToolbox.h>
#import "FSItem.h"
#import "FSItemStore.h"

@implementation FSItemStore

int i = 0;

- (NSArray *)allItems
{
    return allItems;
}



+ (FSItemStore *)defaultStore;
{
    static FSItemStore *defaultStore = nil;
    if(!defaultStore)
        defaultStore = [[super allocWithZone:nil] init];

    return defaultStore;
}



- (FSItem *)createItem
    {
        FSItem *item = [[FSItem alloc] init];

        if (i < [animals count])
        {
            [item setTitle: [animals objectAtIndex: i]];
            [item setSound: [sounds objectAtIndex: i]];
            [item setPlays: 0];
            i++;

            [allItems addObject: item];
        }

        return item;

    }

@end

FSItemStore 似乎是我的问题所在。它说找不到声音和动物的方法定义，声音和动物都是未声明的标识符。有人有什么想法吗？

Answer 1

你的问题是，在你的 H 文件中，你声明你的类将实现一个名为 animals 的方法，该方法将返回一个 NSArray，并且方法调用听起来将返回另一个 NSArray，但在你的 M 文件中你没有实现这些方法。

在您的 FSItemStore.m 中，您应该实现这些方法:

- (NSArray *)animals{
    //Do whatever this method is supposed to do, return an NSArray.
}
- (NSArray *)sounds
{
    //Do whatever this method is supposed to do, return an NSArray.
}

编辑

如果您假装 FSItemStore 继承了 FSItem 的方法，则必须以这种方式声明接口(interface):

@interface FSItemStore : FSItem  //FSItem instead of NSObject
{
    NSMutableArray *allItems;
}