iOS - 检测到附件 URL，但未针对不同项目显示

Question

我目前正在尝试让图像显示在我的表格 View 中。但是，看起来当它获取最后一个图像时，它会将所有图像设置为该图像。

该图片来 self 的第一篇博客文章。

这是我的 RSS 检测代码:

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return feeds.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];
    cell.textLabel.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"title"];
    NSString *textFiltered = [[feeds objectAtIndex:indexPath.row] objectForKey: @"description"];
    cell.detailTextLabel.text = [textFiltered stringByConvertingHTMLToPlainText];
    //cell.detailTextLabel.text = [[feeds objectAtIndex:indexPath.row] objectForKey: @"pubDate"];
    //NSString *imageURLString = [[feeds objectAtIndex:indexPath.row] objectForKey: @"enclosure"];

                                NSData *imageData = [NSData dataWithContentsOfURL:imageURL];

                                cell.imageView.image = [UIImage imageWithData:imageData];


    return cell;
}

#pragma mark - parsing of RssFeed Values

-(void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{
    element = elementName;

    if ([element isEqualToString:@"item"]) {
        item = [[NSMutableDictionary alloc]init];
        title = [[NSMutableString alloc]init];
        link = [[NSMutableString alloc] init];
        desc = [[NSMutableString alloc] init];
        image = [[NSMutableString alloc] init];
        pubDate = [[NSMutableString alloc] init];
        feedEnclosure = [[NSMutableString alloc] init];
        encodedContent = [[NSMutableString alloc] init];
        //imageURL = [[NSURL alloc] init];
    }if ([element isEqualToString:@"enclosure"]){
        NSString *imageStr = [NSString stringWithString:[attributeDict objectForKey:@"url"]];
        imageURL = [NSURL URLWithString:imageStr];
    }

}

-(void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if ([elementName isEqualToString:@"item"]) {

        [item setObject:title forKey:@"title"];
        [item setObject:link forKey:@"link"];
        [item setObject:desc forKey:@"description"];
        [item setObject:pubDate forKey:@"pubDate"];
        [item setObject:feedEnclosure forKey:@"enclosure"];
        [item setObject:encodedContent forKey:@"content:encoded"];
        [item setObject:imageURL forKey:@"url"];
        [feeds addObject:[item copy]];


    }
}

-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    if ([element isEqualToString:@"title"]) {
        [title appendString:string];
    }else if ([element isEqualToString:@"link"]){
        [link appendString:string];
    }else if ([element isEqualToString:@"description"]){
        [desc appendString:string];
    }else if ([element isEqualToString:@"pubDate"]){
        [pubDate appendString:string];
    }else if ([element isEqualToString:@"content:encoded"]){
        [encodedContent appendString:string];
    }
}

- (void)parserDidEndDocument:(NSXMLParser *)parser {

    [self.tableView reloadData];

}

你们知道我如何让它发挥作用吗？

Answer 1

您正在使用 ivar imageURL 设置表中每一行的图像。这当然意味着每一行都会有相同的图像。您需要在特定于行的数据中存储每一行​​的各个图像 URL。

您似乎在特定于行的数据中设置了 url 键。在设置每个单元格时使用它而不是 imageURL。

另请注意，在每个单元格的主线程上加载 NSData 对象是一个非常糟糕的主意。如果 Internet 连接速度很慢，这将使您的 UI 非常不稳定且 react 迟钝。在后台加载图片有很多解决方案。

更新:

试试这个:

NSURL *url = feeds[indexPath.row][@"url"];
NSData *imageData = [NSData dataWithContentsIfURL:url];