Question

我尝试使用iOS 5.0触摸按钮，从一个视图导航到另一个视图。

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

视图未加载到视图上。我想我错过了什么。

申请：appDelegate

中的didFinishLaunchingWithOptions：

- (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

- (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

你的代码看起来没问题，所以必须是self.navigationController是nil。。。你有没有设置导航控制器？

要使代码正常工作，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中的根视图控制器，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，但是您得到的图片就是您必须将根视图控制器设置为导航控制器，如下所示：

 self.window.rootViewController = navigationController;

如果你愿意，你也可以制作一个自定义的根视图控制器，但上面的内容将让你实现你想要做的事情 - UINavigationController将在你的应用程序中用作导航系统。

Answer 2

您的导航控制器为零。所以用

替换你的didFinishLaunchingWithOptions方法

- (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];
    }
    UINavigationController *navcontroller = navigationController = [UINavigationController alloc] initWithRootViewController:self.viewController];
    self.window.rootViewController = navcontroller;
    [self.window makeKeyAndVisible];
    return YES;
}

现在你有一个导航控制器，所以对self.navigationController的push方法的调用应该推送第二个控制器。

Answer 3

请尝试

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

 // test_details_iPhone.xib and test_details_iPad.xib
 //Change initWithNibName@"test_details" with test_details_iPhone or test_details_iPad

iOS无法加载视图

3 个答案: