ios - DetailViewController 仅在第二次加载网页

Question

好的，所以我有一个主详细信息应用程序，当用户单击某个单元格时，它会在 DetailViewController 中加载网页。问题是，在 iPhone 版本(这是一个通用应用程序)上，我必须单击单元格，然后返回 MasterViewController，然后再次单击单元格才能加载网页。我只需要做一次，我认为这就像第一次启动网页或其他东西一样。但在 iPad 版本上，它会在第一次加载。那么怎么回事？

这是我的 applicationDidFinishLaunching AppDelegate.m 文件的代码，我在其中初始化 DetailViewController

if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
    MasterViewController *masterViewController = [[MasterViewController alloc] initWithNibName:@"MasterViewController_iPhone" bundle:nil];
    self.navigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];
    self.window.rootViewController = self.navigationController;
    masterViewController.detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController_iPhone" bundle:nil];
} else {
    MasterViewController *masterViewController = [[MasterViewController alloc] initWithNibName:@"MasterViewController_iPad" bundle:nil];
    UINavigationController *masterNavigationController = [[UINavigationController alloc] initWithRootViewController:masterViewController];

    DetailViewController *detailViewController = [[DetailViewController alloc] initWithNibName:@"DetailViewController_iPad" bundle:nil];
    UINavigationController *detailNavigationController = [[UINavigationController alloc] initWithRootViewController:detailViewController];

    masterViewController.detailViewController = detailViewController;

    self.splitViewController = [[UISplitViewController alloc] init];
    self.splitViewController.delegate = detailViewController;
    self.splitViewController.viewControllers = @[masterNavigationController, detailNavigationController];

    self.window.rootViewController = self.splitViewController;
}

这是 didSelectCellAtIndexPath 的代码

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    NSDictionary *object = _objects[indexPath.row];
    NSURL *ex = [NSURL URLWithString:[object objectForKey:@"url"]];
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
    self.detailViewController.detailItem = object;
        [self.detailViewController loadURL:ex];
        self.detailViewController.detailItem = object;
        [self.detailViewController loadURL:ex];
        [self.navigationController pushViewController:self.detailViewController animated:YES];
    } else {
        self.detailViewController.detailItem = object;
        [self.detailViewController loadURL:ex];
    }
}

Answer 1

在 iPad 上，您在 Split View Controller 中拥有 2 个 Controller ，因此它们会被实例化，并且它们的 View 会在应用程序启动时加载。在 iPhone 上，第二个 Controller 被实例化，但它的 View 只有在你按下它时才会加载——我认为这就是区别。您应该尝试将detailController方法loadURL:移动到它的viewDidAppear方法，而不是将其放在主 Controller 的didSelectRowAtIndexPath方法中。