ios - 如何在 Objective-C 中将图像从主 viewController 设置到 tableView 单元格？

Question

我正在用 WebService 编写程序...在主视图 Controller 中....

AppListTableViewController *appList = [self.storyboard instantiateViewControllerWithIdentifier:@"ALTVC"];

self.dataTask = [self.urlSession dataTaskWithRequest:self.urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {

     NSMutableDictionary *serverRes = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

     NSString *imageLink = [[[[[[serverRes objectForKey:@"feed"] objectForKey:@"entry"] objectAtIndex:0] objectForKey:@"im:image"] objectAtIndex:0] objectForKey:@"label"];

     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     [defaults setObject:imageLink forKey:@"image"];

     [self.dataTask resume];
}

    [self.navigationController pushViewController:appList animated:YES];

来自服务器的图像链接成功...但是如何在 tableView 单元格中发送和显示该图像。

在 tableView Controller 中....

cell.imageView.image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[defaults objectForKey:@"image"]]]]; 

它不在单元格中显示任何图像...

Answer 1

在通话完成之前就向您推送 VC 的原因，请执行以下操作

self.dataTask = [self.urlSession dataTaskWithRequest:self.urlRequest completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)     {

     NSMutableDictionary *serverRes = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];

     NSString *imageLink = [[[[[[serverRes objectForKey:@"feed"] objectForKey:@"entry"] objectAtIndex:0] objectForKey:@"im:image"] objectAtIndex:0] objectForKey:@"label"];

   if (imageLink)
    {
      NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     [defaults setObject:imageLink forKey:@"image"];
        // call your navigation inside the block
        AppListTableViewController *appList = [self.storyboard instantiateViewControllerWithIdentifier:@"ALTVC"];
       [self.navigationController pushViewController:appList animated:YES];
    }


    }];

     [self.dataTask resume];