iOS 无法加载 View

Question

我正在尝试使用 iOS 5.0 通过触摸按钮从一个 View 导航到另一个 View 。

我正在使用的代码

- (IBAction)Actionlogin:(id)sender {
    NSLog(@" login button has been pressed");
       NSLog(@"In init");
        test_details *aSecondPageController=[[test_details alloc]initWithNibName:@"test_details" bundle:nil];
       [self.navigationController pushViewController:aSecondPageController animated:NO];
      }

我有两个 xib 文件 test_details_iPhone.xib 和 test_details_iPad.xib

在我的 testdetails.m 中

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    NSLog(@"it is coming here in second view");
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {
        // Custom initialization
    }
    NSLog(@"it has been returned ");
    return self;


}

日志

2013-04-25 11:06:17.191 app_gototest[3067:207]  login button has been pressed
2013-04-25 11:06:17.194 app_gototest[3067:207] In init
2013-04-25 11:06:17.195 app_gototest[3067:207] it is coming here in second view
2013-04-25 11:06:17.196 app_gototest[3067:207] it has been returned 

View 未加载到 View 中。我想我遗漏了什么。

application:didFinishLaunchingWithOptions: 在appDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPhone" bundle:nil];
    } else {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPad" bundle:nil];
    }
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];
    return YES;
}

** 我正在尝试 Jasper Blue 的方法**

argc    int 1
argv    char ** 0xbfffed2c
*argv   char *  0xbfffee44

在 appDeleagte.m 中

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
        UINavigationController* navigationController; 
        // Override point for customization after application launch.
        if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
            self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPhone"     bundle:nil];
            navigationController = [[UINavigationController alloc]         initWithRootViewController:_viewController];
        } else {
            self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPad"     bundle:nil];
            navigationController = [[UINavigationController alloc] initWithRootViewController:_viewController];
        }
        self.window.rootViewController = navigationController;
        [self.window makeKeyAndVisible];
        return YES;
}

Answer 1

您的代码看起来不错，所以 self.navigationController 一定是 nil。 . .您是否设置了导航 Controller ？

要让您的代码正常工作，您当前的 UIViewController 需要包含在 UINavigationController 中。 . .您可以将 UINavigationController 设置为应用程序委托(delegate)中的 Root View Controller ，如下所示:

{
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    UINavigationController* navigationController; 
    // Override point for customization after application launch.
    if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPhone"     bundle:nil];
    navigationController = [UINavigationController alloc]         initWithRootViewController:viewController];
    } else {
        self.viewController = [[ViewController alloc] initWithNibName:@"ViewController_iPad"     bundle:nil];
        navigationController = [UINavigationController alloc] initWithRootViewController:viewController];
    }
    self.window.rootViewController = navigationController;
    [self.window makeKeyAndVisible];
    return YES;
}

注意:您可以稍微清理上面的代码，但您明白了，您必须将 Root View Controller 设置为导航 Controller ，如下所示:

 self.window.rootViewController = navigationController;

如果您愿意，您也可以创建一个自定义 Root View Controller ，但以上内容可以让您实现您想要做的事情 - UINavigationController 将用作整个应用程序的导航系统。