Question

好的，我是一个Master Detail应用程序，当用户点击一个单元格时，它会在DetailViewController中加载一个网页。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，然后返回到MasterViewController，然后再次单击该单元格以加载网页。我只需要这样做一次，我认为这就像是第一次启动网页或其他内容。虽然在iPad版本上，它第一次加载它。怎么了？

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;
}

这里是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，您在分割视图控制器中有2个控制器，因此它们会被实例化，并在应用启动时加载它们的视图。在iPhone上，第二个控制器被实例化，但是在你推动它之前它的视图是不加载的 - 我认为这是不同的。您应该尝试将detailController方法loadURL：移动到它的viewDidAppear方法，而不是将它放在主控制器的didSelectRowAtIndexPath方法中。

DetailViewController仅在第二次加载网页

1 个答案: