ios 7 展示了第一个带后退按钮的导航 Controller

Question

我正在展示一个新的 View TableView Controller 作为导航 Controller 的根 Controller 。然后我添加一个带有选择器的后退按钮，但是当我单击该按钮时，没有任何内容被调用。我只在导航 Controller 中展示它，因为我想在表格 View 上有后退按钮。这是我显示 Controller 的代码:

UIStoryboard *sb = [UIStoryboard storyboardWithName:@"Main_iPhone" bundle:nil];

    ATDetailTableViewController *detailViewController = [sb instantiateViewControllerWithIdentifier:@"ATDetailTableViewController"];
    detailViewController.propToDisplay = self.apartments[0];
    detailViewController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:detailViewController];
    [self presentViewController:nav animated:YES completion:nil];

然后当 detailviewcontroller 加载时，我创建了不调用选择器方法的条形按钮项:

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back"
                                                                   style:UIBarButtonItemStyleBordered
                                                                  target:nil
                                                                  action:@selector(backPressed)];
    self.navigationItem.leftBarButtonItem = backButton;
}

- (void)backPressed
{
    NSLog(@"back pressed...");
    [self.presentingViewController.presentingViewController dismissViewControllerAnimated:YES completion:nil];
}

此处的最佳做法是什么？我应该只制作一个带有工具栏的 View Controller 吗？另外，我收到警告:不鼓励在分离的 View Controller 上呈现 View Controller

Answer 1

问题是您将 target 参数设置为 nil 而不是 self。你想要:

- (void)viewDidLoad
{
    [super viewDidLoad];
    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"Back"
                                                                  style:UIBarButtonItemStyleBordered
                                                                  target:self
                                                                  action:@selector(backPressed)];
    self.navigationItem.leftBarButtonItem = backButton;
}