如何以编程方式将UIToolbar添加到UITableViewController？

Question

我选择在没有笔尖的情况下使用UITableViewController。我需要一个UIToolbar，底部有两个按钮。做这件事最简单的方法是什么？

P.S.我知道我可以轻松使用UIViewController并添加UITableView，但是我希望整个应用程序看起来一致。

有人可以帮忙吗？

我看到下面的例子，我不知道它的有效性：

(void)viewWillAppear:(BOOL)animated { 
    [super viewWillAppear:animated]; 

    //Initialize the toolbar 
    toolbar = [[UIToolbar alloc] init]; toolbar.barStyle = UIBarStyleDefault; 

    //Set the toolbar to fit the width of the app. 
    [toolbar sizeToFit]; 

    //Caclulate the height of the toolbar 
    CGFloat toolbarHeight = [toolbar frame].size.height; 

    //Get the bounds of the parent view 
    CGRect rootViewBounds = self.parentViewController.view.bounds; 

    //Get the height of the parent view. 
    CGFloat rootViewHeight = CGRectGetHeight(rootViewBounds); 

    //Get the width of the parent view, 
    CGFloat rootViewWidth = CGRectGetWidth(rootViewBounds); 

    //Create a rectangle for the toolbar 
    CGRect rectArea = CGRectMake(0, rootViewHeight - toolbarHeight, rootViewWidth, toolbarHeight); 

    //Reposition and resize the receiver 
    [toolbar setFrame:rectArea]; 

    //Create a button 
    UIBarButtonItem *infoButton = [[UIBarButtonItem alloc] initWithTitle:@"back" 
                    style:UIBarButtonItemStyleBordered 
                    target:self 
                    action:@selector(info_clicked:)]; 

    [toolbar setItems:[NSArray arrayWithObjects:infoButton,nil]]; 

    //Add the toolbar as a subview to the navigation controller. 
    [self.navigationController.view addSubview:toolbar]; 

    [[self tableView] reloadData]; 
} 

(void) info_clicked:(id)sender { 

    [self.navigationController popViewControllerAnimated:YES]; 
    [toolbar removeFromSuperview]; 

} 

Answer 1

最简单的方式做的是建立在UINavigationController的顶级项目。它已经有一个工具栏，它只是默认隐藏。您可以通过切换toolbarHidden属性来显示它，只要它在导航控制器层次结构中，表格视图控制器就可以使用它。

在应用程序委托，或者在对象应用程序委托将控制传递到，与UITableViewController作为根视图控制器创建导航控制器：

- (void)application: (UIApplication *)application 
      didFinishLaunchingWithOptions: (NSDictionary *)options 
{ 
    MyTableViewController   *tableViewController; 
    UINavigationController  *navController; 

    tableViewController = [[ MyTableViewController alloc ] 
           initWithStyle: UITableViewStylePlain ]; 
    navController = [[ UINavigationController alloc ] 
          initWithRootViewController: tableViewController ]; 
    [ tableViewController release ]; 

    /* ensure that the toolbar is visible */ 
    navController.toolbarHidden = NO; 
    self.navigationController = navController; 
    [ navController release ]; 

    [ self.window addSubview: self.navigationController.view ]; 
    [ self.window makeKeyAndVisible ]; 
} 

然后设置在MyTableViewController对象中的工具栏项：

- (void)viewDidLoad 
{ 
    UIBarButtonItem   *buttonItem; 

    buttonItem = [[ UIBarButtonItem alloc ] initWithTitle: @"Back" 
              style: UIBarButtonItemStyleBordered 
              target: self 
              action: @selector(goBack:) ]; 
    self.toolbarItems = [ NSArray arrayWithObject: buttonItem ]; 
    [ buttonItem release ]; 

    /* ... additional setup ... */ 
} 

Answer 2

您还可以在NavigationController属性检查器中检查“显示工具栏”选项。

Answer 3

下面是一个简单的例子，这可能有助于

UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil]; 
    UIBarButtonItem *trashItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:@selector(deleteMessages)]; 
    UIBarButtonItem *composeItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCompose target:self action:@selector(composeMail)]; 
    NSArray *toolbarItems = [NSMutableArray arrayWithObjects:spaceItem, trashItem,spaceItem,composeItem,nil]; 
    self.navigationController.toolbarHidden = NO; 
    [self setToolbarItems:toolbarItems]; 

感谢， prodeveloper