当 UINavigationController 妨碍时访问 UITableView（在 UISplitViewController 中）

Posted 2023-03-04

【中文标题】当 UINavigationController 妨碍时访问 UITableView（在 UISplitViewController 中）

【英文标题】：Accessing a UITableView when a UINavigationController gets in the way (in a UISplitViewController)

【发布时间】：2012-03-08 02:45:04

【问题描述】：

我有一个这样设置的 UISplitViewController：

-(IBAction)makeStory:(id)sender
NSLog(@"makeStory:");

    makeStoryTableViewController = [[MakeStoryTableViewController alloc] initWithNibName:@"MakeStoryTableViewController" bundle:nil];
    MakeSentenceTableViewController *detailViewController = [[MakeSentenceTableViewController alloc] initWithNibName:@"MakeSentenceTableViewController" bundle:nil];
    UISplitViewController *splitViewController = [[[UISplitViewController alloc] init] autorelease];

    UINavigationController *rootNav = [[[UINavigationController alloc] initWithRootViewController:makeStoryTableViewController]autorelease];

    UINavigationController *detailNav = [[[UINavigationController alloc] initWithRootViewController:detailViewController] autorelease];

    splitViewController.viewControllers = [NSArray arrayWithObjects:rootNav, detailNav, nil];
    splitViewController.delegate        = makeStoryTableViewController;

    StoryBotAppDelegate *appDelegate = (StoryBotAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.window setRootViewController:splitViewController];

当我尝试在 UISplitView 委托中设置 detailView 作为 didSelectRowAtIndexPath: 的结果时，我只能访问 NavigationController:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath    
    NSLog(@"ViewControllers: %@", [self.splitViewController viewControllers]);
    MakeSentenceTableViewController *detailViewController = [[self.splitViewController viewControllers] objectAtIndex:1];
    Story *storySet = [fetchedResultsController objectAtIndexPath:indexPath];
    NSLog(@"detailViewController: %@", detailViewController); //Logs a UINavigationController
    [detailViewController setStory:storySet]; //Fails here because Navigation Controllers Can't setStory!
    [detailViewController refreshTables];
 

这很有意义，但是我如何访问 UINavigationController 负责的 TableView？如果我删除 *rootNav 和 *detailNav 并用 splitViewController.viewControllers 语句中的 UITableViews 替换它们，它可以正常工作，但是我没有导航栏：

    MakeSentenceTableViewController *detailViewController = [[MakeSentenceTableViewController alloc] initWithNibName:@"MakeSentenceTableViewController" bundle:nil];
    UISplitViewController *splitViewController = [[[UISplitViewController alloc] init] autorelease];

    //UINavigationController *rootNav = [[[UINavigationController alloc] initWithRootViewController:makeStoryTableViewController]autorelease];

    //UINavigationController *detailNav = [[[UINavigationController alloc] initWithRootViewController:detailViewController] autorelease];

    splitViewController.viewControllers = [NSArray arrayWithObjects:makeStoryTableViewController, detailViewController, nil];
    splitViewController.delegate        = makeStoryTableViewController;

    StoryBotAppDelegate *appDelegate = (StoryBotAppDelegate *)[[UIApplication sharedApplication] delegate];
    [appDelegate.window setRootViewController:splitViewController];

如何访问 Detail TableView 控制器并保留导航栏？

【参考方案1】：

这就是我的想法。我犯了两个错误，在这些错误中我不得不使用 UINavigationController.viewControllers ObjectAtIndex: 属性。

在函数 makeStory 中，我错误地将 UINavigationController 分配为委托而不是 makeStoryTableViewController。我通过这样做来修复它，而不是（特别注意 splitViewController.delegate 部分）：

MakeSentenceTableViewController *detailViewController = [[MakeSentenceTableViewController alloc] initWithNibName:@"MakeSentenceTableViewController" bundle:nil]; 
UISplitViewController *splitViewController = [[[UISplitViewController alloc] init] autorelease];

UINavigationController *rootNav = [[[UINavigationController alloc] initWithRootViewController:makeStoryTableViewController]autorelease];

UINavigationController *detailNav = [[[UINavigationController alloc] initWithRootViewController:detailViewController] autorelease];

splitViewController.viewControllers = [NSArray arrayWithObjects:rootNav, detailNav, nil];

//splitViewController.viewControllers = [NSArray arrayWithObjects:makeStoryTableViewController, detailViewController, nil];
//RootViewController *root = (RootViewController *)[navigationController.viewControllers objectAtIndex:0]

splitViewController.delegate        = [rootNav.viewControllers objectAtIndex:0];

NSLog(@"delegate: %@",  [rootNav.viewControllers objectAtIndex:0]);

StoryBotAppDelegate *appDelegate = (StoryBotAppDelegate *)[[UIApplication sharedApplication] delegate];
NSLog(@"RootViewController: %@", appDelegate.window);

[appDelegate.window setRootViewController:splitViewController];

NSLog(@"AppDelegate.window: %@", appDelegate.window.rootViewController);

我又犯了同样的错误，这次是在 didSelectRowAtIndexPath: 中，并试图在 UINavigationController 中设置 setStory。为了修复它，我做了这个（特别注意关于 navControllerDetail.viewControllers 的一点：

UINavigationController *navControllerDetail;
navControllerDetail = [[self.splitViewController viewControllers] objectAtIndex:1];



MakeSentenceTableViewController *detailViewController;

detailViewController = [navControllerDetail.viewControllers objectAtIndex:0];

Story *storySet = [fetchedResultsController objectAtIndexPath:indexPath];



NSLog(@"detailViewController: %@", detailViewController);
[detailViewController setStory:storySet];
[detailViewController refreshTables];

如果我能弄清楚如何获得SplitViewController to rotate properly！