Question

我有一个表格视图，其中每个单元格都希望从Web服务中填充数据。每个单元格应显示对象的名称，价格和品牌名称。我的名字很好，但价格和品牌名称并不容易。我检查了网络服务，它有价格和品牌名称，所以它肯定是我的代码的问题。到目前为止看起来如何：

    for (NSDictionary *objItem in resultsArray)
{
     NSString *currentItemName = [objectTitlesArray objectAtIndex:indexPath.row];

    if ([currentItemName isEqualToString:objItem[@"title"]])
    {
        cell.nameLabel.text = currentItemName;
        cell.priceLabel.text = objItem[@"price"];
        cell.brandLabel.text = objItem[@"brands"];

    }
}

objectTitlesArray是我单独制作的一个数组，其中包含返回的对象的名称，这就是为什么我可以轻松获取名称的原因。

这里是resultsArray里面的内容：

<__NSArrayI 0x8cb9900>(
{
asins =     (
);
"best_page" =     {
    currency = USD;
    deeplink = "http://www.textbooks.com/iPhone-Book-Covers-iPhone-4S-iPhone-4-and-iPhone-3GS/9780321832764/Scott-Kelby.php";
    description = "\"Excellent Marketplace listings for \"\"iPhone Book: Covers iPhone 4S, iPhone 4, and iPhone 3GS\"\" by Scott Kelby starting as low as $1.99!\"";
    "image_url" = "http://images.textbooks.com/TextbookInfo/Covers/0321832760.gif";
    "in_stock" = 1;
    "live_price_url" = "http://api.invisiblehand.co.uk/v1/pages/live_price?url=http%3A%2F%2Fwww.textbooks.com%2FiPhone-Book-Covers-iPhone-4S-iPhone-4-and-iPhone-3GS%2F9780321832764%2FScott-Kelby.php";
    "original_url" = "http://www.textbooks.com/iPhone-Book-Covers-iPhone-4S-iPhone-4-and-iPhone-3GS/9780321832764/Scott-Kelby.php";
    pnp = "3.99";
    price = "24.99";
    "price_confidence" = low;
    region = us;
    "retailer_name" = "Textbooks.com";
    title = "iPhone Book: Covers iPhone 4S, iPhone 4, and iPhone 3GS";
};
brands =     (
    Pearson
);
categories =     (
);
eans =     (
    9780321832764
);
id = 10a9fb4e3868f5289dc0d53af80ae86a;
"image_url" = "http://images.textbooks.com/TextbookInfo/Covers/0321832760.gif";
isbns =     (
    0321832760
);
models =     (
);
mpns =     (
    0321832760
);
"number_of_pages" = 1;
resource = "/products/10a9fb4e3868f5289dc0d53af80ae86a";
title = "iPhone Book: Covers iPhone 4S, iPhone 4, and iPhone 3GS";
upcs =     (
);
},

感谢所有帮助，并提前感谢。

编辑：

将我的代码更改为：

for (NSDictionary *objItem in resultsArray)
{
     NSString *currentItemName = [objectTitlesArray objectAtIndex:indexPath.row];

    if ([currentItemName isEqualToString:objItem[@"title"]])
    {
        if (cell.priceLabel.text != (id)[NSNull null] && cell.priceLabel.text.length != 0 && cell.brandLabel.text != (id)[NSNull null] && cell.brandLabel.text.length != 0)
        {


        cell.nameLabel.text = currentItemName;
        NSDictionary *bestPageDictionary = objItem[@"best_page"];
        cell.priceLabel.text = bestPageDictionary[@"price"];
        NSArray *brandsArray = objItem[@"brands"];
        cell.brandLabel.text = [brandsArray firstObject];
        }

    }
}

现在我得到NSInvalidArgumentException＆＃39;，原因：＆＃39; - [__ NSCFNumber长度]：无法识别的选择器发送到实例0x8c98c00＆＃39;

Answer 1

您的词典结构与您尝试摆脱它的数据不匹配。

brands是一个数组，而不是一个字符串。它碰巧包含一个字符串元素，所以你只需要抓住它。
```
NSArray *brandsArray = objItem[@"brands"];
cell.brandLabel.text = [brandsArray firstObject];
```

price不在顶级词典中，而是嵌套在其中的另一个词典中。

NSDictionary *bestPageDictionary = objItem[@"best_page"];
cell.priceLabel.text = bestPageDictionary[@"price"];

修改看起来价格实际上可能是一个数字，即使它看起来像是一个字符串。试试这个：

NSDictionary *bestPageDictionary = objItem[@"best_page"];
NSNumber *price = bestPageDictionary[@"price"];
cell.priceLabel.text = [NSString stringWithFormat:@"%@", price];

从Web服务访问SIGABRT访问Dictionary对象

1 个答案: