通过 Segue 将缓存图像传递给 DetailViewController

Question

我正在使用数据任务通过 JSON 文件显示来自外部服务器的文本数据。效果很好我正在使用 AFNetworking 的文件 #import "UIImageView+AFNetworking.h" 从 Tableview 的 Cell 声明中提取的上述数据下载图像，它也工作得很好。 But when selecting a row to pass selected rows Image via Segue to another view controller it giving error,

这是我的 Tableview 单元格代码，它非常好并显示文本和图像数据

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

    Categories * CategoryObject;
    CategoryObject = [categoryArray objectAtIndex:indexPath.row];
    cell.textLabel.text = CategoryObject.categoryTitle;

    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;

    // Configure the cell Image...

    NSURL *url = [NSURL URLWithString:CategoryObject.categoryImage];
    NSURLRequest *request = [NSURLRequest requestWithURL:url];
    UIImage *placeholderImage = [UIImage imageNamed:@"placeholder"];
    __weak UITableViewCell *weakCell = cell;
    [cell.imageView setImageWithURLRequest:request placeholderImage:placeholderImage success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {
        weakCell.imageView.image = image;
        [weakCell setNeedsLayout];
    } failure:nil];

    return cell;   
}

现在看一下出现错误的 Segue 代码

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"showAnotherView"]) {

        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
       DetailImageViewController *destViewController = segue.destinationViewController;
        destViewController.imageName = [ UIImageView objectAtIndex:indexPath.row.image];

    }
}

我的代码出错

no known class method for selector objectAtIndex:

最后一行代码

destViewController.imageName = [ UIImageView objectAtIndex:indexPath.row.image];

我想要完成的事情是解决这个错误并传递上面通过 AFNetworking 下载的缓存图像，并在 segue 中传递该图像以显示在下一个视图控制器中。谁能帮帮我？

Answer 1

查看您的代码，似乎您正在访问 UIImageView 上的 objectAtIndex: 方法，除非您有类别 class 扩展 UIImageView，否则没有该方法.如果你要处理原始选择，它应该是这样的，

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{
    if ([segue.identifier isEqualToString:@"showAnotherView"]) 
    {
        NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
        UITableViewCell * cell = [self.tableView cellForRowAtIndexPath:indexPath];
        DetailImageViewController *destViewController = segue.destinationViewController;
        destViewController.imageName = Cell.imageView.image;

    }
}

希望对您有所帮助。

通过 Segue 将缓存图像传递给 DetailViewController

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