Question

我尝试使用UITableView和一些JSON对象制作商品Feed，但是当我尝试使用JSON数据填充自定义单元格的实例时，UILabel不会更改其文本。

JSON已经过测试并且有效。它遍历循环并创建适量的行。但是文本没有更改为JSON文件中的文本。

这是我的代码：

feed.m

- (void)viewDidLoad {
    [super viewDidLoad];

    NSURL *FeedURL = [NSURL URLWithString:@"http://www.personeelsapp.jordivanderhek.com/company/bijcasper/nieuws.json"];
    NSData *jsonData = [NSData dataWithContentsOfURL:FeedURL];
    NSError *error = nil;
    NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error];

    NSLog(@"%@", dataDictionary);

    self.posts = [NSMutableArray array];
    PostsArray = [dataDictionary objectForKey:@"feed"];

    for (NSDictionary *bpdDictionary in PostsArray) {
        // make new post object
        FeedPosts *posts = [FeedPosts InitPost];
        NSLog(@"feed check %@" ,[bpdDictionary objectForKey:@"name"]);
        posts.postTitle = [bpdDictionary objectForKey:@"name"];
        posts.postProfilepic = [bpdDictionary objectForKey:@"profilePic"];
        posts.postDatum = [bpdDictionary objectForKey:@"timeStamp"];
        posts.postMessage = [bpdDictionary objectForKey:@"status"];
        posts.postImage = [bpdDictionary objectForKey:@"image"];
        [self.posts addObject:posts];
    }
}

 […]

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

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *Cellindentifier = @"PostCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:Cellindentifier forIndexPath:indexPath];

    // Configure the cell...
    FeedPosts *posts = [self.posts objectAtIndex:indexPath.row];

   cell.postTitle.text = @"test title";
   cell.postDatum.text = posts.postDatum.text;
   cell.postMessage.text = posts.postMessage.text;
return cell;
}
}

FeedPosts.h

@property (strong, nonatomic) IBOutlet UILabel *postTitle;
@property (strong, nonatomic) IBOutlet UILabel *postMessage;
@property (strong, nonatomic) IBOutlet UIImageView *postImage;
@property (strong, nonatomic) IBOutlet UIImageView *postProfilepic;
@property (strong, nonatomic) IBOutlet UILabel *postDatum;

// designated init
+ (id) InitPost;

FeedPosts.m

+ (id) InitPost {
    // init new feed item
    return [[self alloc]init];
}

收到以下错误：

-[__NSCFString text]: unrecognized selector sent to instance

我做错了什么？

Answer 1

您已在 FeedPosts 中声明了多个 UILabel 。

FeedPosts *posts = [FeedPosts InitPost];
NSLog(@"feed check %@" ,[bpdDictionary objectForKey:@"name"]);
posts.postTitle = [bpdDictionary objectForKey:@"name"];

在以下代码中，您将 NSString （文本）分配给标签对象：

posts.postTitle.text = [bpdDictionary objectForKey:@"name"];

相反，您应该为这些标签设置文字：

postMessage

同样适用于postDatum和MultiValuedMap<String,String> params = uriInfo.getQueryParameters()。

UITableViewCells不具备自定义价值

1 个答案: