SDWebImage不会从URL中的UITableViewCell

Question

加载图像在我的RSS提要应用程序，我通过输入didStartElement方法解析用的NSXMLParser图片：

If ([element isEqualToString: @ "item"]) { 
         
        Item = [[NSMutableDictionary alloc] init]; 
        Title = [[NSMutableString alloc] init]; 
        Link = [[NSMutableString alloc] init]; 
        PubDate = [[NSMutableString alloc] init]; 
        ImageUrl = [[NSMutableString alloc] init]; 
    } 
     
    If ([element isEqualToString: @ "enclosure"]) { 
        NSString * name = [attributeDict objectForKey: @ "url"]; 
        NSLog (@ "The URL is:% @", name); 
         
    } 

而在didEndElement方法：

If ([elementName isEqualToString: @ "item"]) { 
        [Item setObject: title forKey: @ "title"]; 
        [Item setObject: link forKey: @ "link"]; 
        [Item setObject: pubDate forKey: @ "pubDate"]; 
        [Item setObject: imageUrl forKey: @ "url"]; 
        [Feeds addObject: [item copy]]; 
    } 

好的。这工作，我拥有他们所有的链接。

现在我想将这些URL加载到我的UITableView中的单元格中。所以我使用了'SDWebImage'窗格。

cellForRowAtIndexPath方法中我有：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath]; 
    cell.textLabel.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];  
    cell.textLabel.numberOfLines = 0; 
    [cell.textLabel setLineBreakMode:NSLineBreakByWordWrapping]; 
    cell.detailTextLabel.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"pubDate"]; 
    NSString *str = [[feeds objectAtIndex:indexPath.row] objectForKey: @"pubDate"]; 
    cell.detailTextLabel.text = str; 
    NSString * string = [[feeds objectAtIndex:indexPath.row] objectForKey: @"url"]; 
    NSLog(@"THE URL IS: %@", string); 

    [cell.imageView sd_setImageWithURL:[NSURL URLWithString:string] placeholderImage:[UIImage imageNamed:@"placeholder.gif"]]; 

    return cell; 

    } 

但没有发生。这是我目前的情况。

如何解决？

Answer 1

sd_setImageWithURL：（null的NSURL *）网址

API允许为空的值，所以你需要检查，如果两个string和[NSURL URLWithString: string]是非零使用它们之前。