Question

请帮助理解导航。我正在使用xibs。该计划是：https://www.dropbox.com/s/o82fxpte0hmyxcq/Scheme_Simple.jpg。这是我的代码：

@implementation AppDelegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.window.backgroundColor = [UIColor whiteColor];
    FirstViewController *firstViewController = [[firstViewController alloc] initWithNibName:@"firstViewController" bundle:nil];
    UINavigationController *navigationController = [[UINavigationController alloc] initWithRootViewController:firstViewController];
    self.window.rootViewController = navigationController;
    [self.window makeKeyAndVisible];
    return YES;
}

@implementation FirstViewController
- (IBAction)button1Tapped:(id)sender {
    SecondViewController *secondViewController = [[SecondViewController alloc] init];
    secondViewController.title = @"View2";
    [self.navigationController pushViewController:secondViewController animated:YES];
}

@implementation SecondViewController
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
    ThirdViewController *thirdViewController = [[ThirdViewController alloc] init];
    thirdViewController.title = @"View3";

    if (indexPath.row == 0) {    
        [self.navigationController pushViewController:thirdViewController animated:YES];
        [secondViewTableView deselectRowAtIndexPath:indexPath animated:YES];
    }
}

所以，我有疑问：

我应该在哪里创建下一个视图？在我的代码视图中创建了“previous”类：在FirstViewController中创建的view2，在SecondViewController等中创建的view3。所有新的ViewControllers都在启动导航的方法内，是否正确？我认为这是错误的，但导航工作正常。
导航栏中标题的问题。事实证明，view2的标题仅在从view1移动到view2时显示，但是当从view3返回到view2时 - 标题消失。我用Google搜索，尝试将self.title = @"name"添加到viewDidLoad，initWithNibName，viewWillAppear - 这些都不起作用。

Answer 1

所以我解决了导航栏标题消失的问题。问题出在我的自定义后退按钮中：self.navigationItem.title = @""; 它正在工作，标题“Back”从我的后退按钮消失了，但导航栏的标题也消失了。使按钮无标题的正确方法是：

UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStyleBordered target:nil action:nil];
[self.navigationItem setBackBarButtonItem:backButton];

在iOS应用中使用xib进行导航

1 个答案: