Question

我在一个视图控制器中创建NSURL，然后在另一个视图控制器中使用它。 URL包含正在创建它的视图控制器中的正确字符串，但在我传递给它的视图控制器中，它是NULL。

NSData *data = feed.imageData;

NSData *stringData = feed.urlString;
self.stringForURL = [[NSString alloc] initWithData:stringData encoding:NSUTF8StringEncoding];
self.stringForURL = [self.stringForURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
self.finalURL = [NSURL URLWithString:self.stringForURL];

这是我将它传递给另一个视图控制器的地方：

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
        NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];

        // Code to create detailed view and set properties
        DetailViewController *detailViewController = [[DetailViewController alloc] init];
        detailViewController.managedObjectContext = self.managedObjectContext;
        detailViewController.managedObject = object;
        NSLog(@"Here is the final URL:%@", [self.finalURL absoluteString]);
        detailViewController.finalURL = self.finalURL;


        DetailViewController *detailsViewController = [[DetailViewController alloc] init];
        [self.navigationController pushViewController:detailsViewController animated:YES];

}

在secondviewcontroller.h中：

@property (strong, nonatomic) NSURL *finalURL;

在secondviewcontroller.m中：

AVAsset *asset = [AVURLAsset URLAssetWithURL:self.finalURL options:nil];

Answer 1

你做得对，但你又创建了一个detailViewController实例并推送它。

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSManagedObject *object = [[self fetchedResultsController] objectAtIndexPath:indexPath];

    // Code to create detailed view and set properties
    DetailViewController *detailViewController = [[DetailViewController alloc] init];
    detailViewController.managedObjectContext = self.managedObjectContext;
    detailViewController.managedObject = object;
    NSLog(@"Here is the final URL:%@", [self.finalURL absoluteString]);
    detailViewController.finalURL = self.finalURL;


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

}

NSURL未在视图控制器之间传递

1 个答案: