ios - iCarousel + UITableView = cellForRowAtIndexPath indexPath 始终为空

Question

我有一个让我头痛的问题。当我调用:

(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath`

我总是得到 indexPath=null 并出现以下错误。

 Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[Categories copyWithZone:]: unrecognized selector sent to instance 0xc386b20'

我的 GallerySpirituosenViewController.h 中有这段代码:

@interface GallerySpirituosenViewController :  UIViewController <iCarouselDataSource, iCarouselDelegate , UITableViewDelegate, UITableViewDataSource>
  @property (weak, nonatomic) IBOutlet UITableView    *table_categories;
  @property (weak, nonatomic) IBOutlet UITableView    *table_brands;
  @property (weak, nonatomic) IBOutlet UITableView    *table_items;
  @property (weak, nonatomic) IBOutlet iCarousel      *carousel;
  @property (weak, nonatomic) IBOutlet UIView         *filtersContainer;
@end

稍后在我的 GallerySpirituosenViewController.m 中，我扩展了正常工作的“iCarrousel”，我有一个 View ，里面有 3 个 UITableView。

在这里，我可以展示如何为一张表调用datasource 和delegate:

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.table_brands.dataSource = self;
    self.table_brands.delegate = self;

    _carousel.type      = iCarouselTypeCoverFlow2;
}

- (void)viewDidUnload
{
    [super viewDidUnload];

    //free up memory by releasing subviews
    self.carousel = nil;
}

稍后是我填充表格的代码:

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


- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    //  NSInteger carouselIndex = [self.carousel indexOfItemViewOrSubview:tableView];
    //  PersonData *data = [items objectAtIndex:carouselIndex];
    static NSString *simpleTableIdentifier = @"SimpleTableItem";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
    }

    cell.textLabel.text = [categories objectAtIndex:indexPath.row];

    return cell;
}

下面是对象类别的调试:

以及具有空值的 indexPath:

这里还有对象Category.h

#import <Foundation/Foundation.h>

@interface Categories : NSObject
    @property (nonatomic, retain) NSString *id;
    @property (nonatomic, retain) NSString *title;
    @property (nonatomic, retain) NSString *sys_language_uid;
@end

和Category.m

#import "Category.h"

@implementation Categories

@synthesize id,title,sys_language_uid;


- (void)encodeWithCoder:(NSCoder *)encoder {
    [encoder encodeObject:id forKey:@"id"];
    [encoder encodeObject:title forKey:@"title"];
    [encoder encodeObject:sys_language_uid forKey:@"sys_language_uid"];
}

- (id)initWithCoder:(NSCoder *)decoder {
    if (self = [super init]) {
        self.id = [decoder decodeObjectForKey:@"id"];
        self.title = [decoder decodeObjectForKey:@"title"];
        self.sys_language_uid = [decoder decodeObjectForKey:@"sys_language_uid"];
    }
    return self;
}


@end

Answer 1

[categories objectAtIndex:indexPath.row] 返回类别对象。

你得到这样的字符串。

cell.textLabel.text = [类别objectAtIndex:indexPath.row].id

或

cell.textLabel.text = [类别 objectAtIndex:indexPath.row].title

编辑更多:

您应该像这样声明标题变量

@property(nonatomic,strong) NSString*title;

不

@property(nonatomic,copy) NSString*title;