标签栏和导航控制器：我的Interface Builder接线出了什么问题？ [英] Tab Bar and Nav Controller: Where did I go wrong in my Interface Builder wiring?

问题描述

我一直在使用Tab Bar项目类型的XCode和Interface Builder中的iPhone应用程序。在获得主题（业务部门）的表格视图工作正常后，我意识到我需要添加导航控件以允许用户钻入子主题（子部门）表。

I've been working on an iPhone application in XCode and Interface Builder of the Tab Bar project type. After getting a table view of topics (business sectors) working fine I realized that I would need to add a Navigation Control to allow the user to drill into a subtopics (subsectors) table.

作为一名绿色的Objective-C开发人员，这令人困惑，但我设法通过阅读各种文档来尝试一些不同的IB选项。我当前的设置是一个标签栏控制器，标签1作为导航控制器，标签2是一个普通视图，其中放置了一个表格视图。接线工作原理：我可以在选择表行时记录，并且我已准备好将新的View Controller推入堆栈，以便显示子视图Table View。

As a green Objective-C developer, that was confusing, but I managed to get it working by reading various documentation trying out a few different IB options. My current setup is a Tab Bar Controller with Tab 1 as a Navigation Controller and Tab 2 a plain view with a Table View placed into it. The wiring works: I can log when table rows are selected and I'm ready to push a new View Controller onto the stack so that I can display the subtopics Table View.

我的问题：由于某种原因，第一个选项卡的表视图是第二个选项卡的委托和dataSource。这对我来说没有意义，我无法弄清楚为什么这是唯一有效的设置。我有其他问题，我认为这是由愚蠢的布线引起的。

My problem: For some reason the first tab's Table View is a delegate and dataSource of the second tab. It doesn't make sense to me and I can't figure out why that's the only setup that works. I am having other problems that I believe are caused by the goofy wiring.

替代文字http://i43.tinypic.com/30nap85.jpg

以下是布线：

• 导航控制器（Sectors）是Tab Bar的
  代表
  
  
  
  
  • 导航栏是
    a导航控制器代表
    （部门）
  
  
  • 查看控制器（部门）有视图表视图
  
  
  • 表视图（在导航中
    控制器（扇区））是第一视图控制器的委托
    
    （公司）
  
  
  • 表视图（在导航$中） b $ b Controller（Sectors））是First View Controller的数据源插座
    （公司）
  
  
  • Navigation Controller (Sectors) is a delegate of Tab Bar
    • Navigation Bar is a delegate of Navigation Controller (Sectors)
    • View Contoller (Sectors) has a view of Table View
    • Table View (in Navigation Controller (Sectors)) is a delegate of First View Controller (Companies)
    • Table View (in Navigation Controller (Sectors)) is a dataSource outlet of First View Controller (Companies)
    
    
    • First View Contoller（Sectors）有一个Table View视图
    
    
    • 表视图（在First View Controller中） （公司））没有连接到数据来源插座并且不是代表
    
    

    当我点击标签按钮并查看在Inspector中，我看到第一个选项卡正确连接到我的MainWindow.xib，第二个选项卡选择了一个名为SecondView.xib的笔尖。它位于MainWindow.xib的文件所有者中，我在.h中继承了UITableViewDataSource和UITableViewDelegate（以及UITabBarControllerDelegate），在.m中我实现了委托方法。

    When I click the tab buttons and look at the Inspector I see that the first tab is correctly hooked up to my MainWindow.xib and the second tab has selected a nib called SecondView.xib. It's in the File's Owner of MainWindow.xib where I inherit UITableViewDataSource and UITableViewDelegate (and also UITabBarControllerDelegate) in the .h, and in the .m where I implement the delegate methods.

    为什么此设置仅在我的第一个选项卡（View Controller（Sectors））中的Table View是第二个选项卡的委托和dataSource时有效？我很困惑：为什么不需要将它连接到可以看到表视图的导航控制器选项卡（导航控制器（扇区））？在第二个选项卡上看到的表视图既没有dataSource也没有委托。

    Why does this setup only work when the Table View in my first tab (View Controller (Sectors)) is a delegate and dataSource of the second tab? I'm confused: why wouldn't it need to be hooked up to the Navigation Controller-enabled tab in which the Table View is seen (Navigation Controller (Sectors))? The Table View seen on the second tab has neither dataSource and is not a delegate.

    alt text http://i40.tinypic.com/15ri1ig.jpg
    替代文字http://i44.tinypic.com/2dwete9.jpg

    我无法获得pushViewController fire（self.navigationController不是nil但是新的View Controller仍然没有加载）我怀疑我需要解决这个IB布线问题才能解决为什么Nav Controller不会将新的View Controller推到叠加。

    I'm having trouble getting a pushViewController to fire (self.navigationController is not nil but the new View Controller still doesn't load) and I suspect that I need to work out this IB wiring issue before I can troubleshoot why the Nav Controller won't push a new View Controller onto the stack.

    if(nil == self.navigationController) {
        NSLog(@"self.navigationController is nil.");
    } else {
        NSLog(@"self.navigationController is not nil.");
        SectorList *subsectorViewController = [[SectorList alloc] initWithNibName:@"SectorList" bundle:nil];
        subsectorViewController.title = @"Subsectors";
        [[self navigationController] pushViewController:subsectorViewController animated:YES];
        [subsectorViewController release];
    }
    

    
    

    推荐答案

    跳出来的第一件事在我看来，你的Sectors选项卡的视图控制器是一个UIViewController，而不是UITableViewController。您应该删除整个视图控制器并从IB中的库中拖出UITableViewController并将其放在UINavigationController上。它将附带一个UITableView作为其视图，UITableViewController已经设置为该tableView的dataSource和委托。

    The first thing that jumps out at me is that the view controller for your Sectors tab is a UIViewController, instead of a UITableViewController. You should just delete that whole view controller and drag a UITableViewController from your library in IB and drop it on your UINavigationController. It will come with a UITableView already hooked up as its view, with the UITableViewController already set as the dataSource and delegate for that tableView.

    在你的NIB中有一个UITableViewController然后，您应该在检查器中将其类名更改为您在代码中实现的UITableViewController子类的名称。

    Once you have a UITableViewController in your NIB, you should then change its class name in the inspector to the name of a UITableViewController subclass that you've implemented in code.

    另一件事：当你声明你的表视图是一个数据源和是一个委托时，你有向后的dataSource和委托关系。只是为了澄清：

    One other thing: You have the dataSource and delegate relationships backwards when you state that your table view "is a dataSource," and "is a delegate". Just to clarify:

    
    
    • 一个tableView有一个dataSource属性，它指向一个实现UITableViewDataSource协议的对象（通常是一个UITableViewController子类实例） 。
    
    
    • 一个tableView有一个委托属性，它指向一个实现UITableViewDelegate协议的对象（通常是同一个UITableViewController子类实例）。
    
    
    • UITableViewController类实现UITableViewDataSource和UITableViewDelegate协议。正确配置后，您的自定义UITableViewController子类是其tableView的dataSource和委托。
    
    

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