Question

我想在应用程序的开头显示模态视图，但它不会出现。这是我的代码：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    [self initDataBase];
    CustomerModel *customer = [[[CustomerPersistor alloc] init] getLoggedCustomer];

    self.window.rootViewController = self.tabBarController;

    self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
    // Override point for customization after application launch.

    UIViewController *profileViewController = [[[ProfileViewController alloc] initWithNibName:@"ProfileViewController" bundle:nil] autorelease];
    profileViewController.title = @"Profile";
    UINavigationController *profileNavigation = [[[UINavigationController alloc] initWithRootViewController:profileViewController] autorelease];

    self.tabBarController = [[[UITabBarController alloc] init] autorelease];
    self.tabBarController.viewControllers = [NSArray arrayWithObjects:profileNavigation,  nil];
    self.window.rootViewController = self.tabBarController;

    [self.window makeKeyAndVisible];

    if(customer == nil) { NSLog(@"HO");
        ViewController *login = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
    //login.delegate = self.tabBarController.view;

        [self.viewController presentModalViewController:[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]  animated:YES];
    }
    return YES;

}

我该如何解决？

Answer 1

首先，似乎没有设置的self.viewController属性，并且您将两次实例化相同的“ViewController”。这是错的：

ViewController *login = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]; 
//login.delegate = self.tabBarController.view;
[self.viewController presentModalViewController:[[ViewController alloc] initWithNibName:@"ViewController" bundle:nil]  animated:YES];

尝试将此代码移动到profileViewController的viewDidLoad ...即。让TabBarController与其第一个选项卡的视图控制器一起加载。

Answer 2

从模型视图中启动一个instanse，如下所示：

modelView = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];

请按照以下列表：

设置viewController模型呈现的样式

[modelView setModalPresentationStyle:UIModalPresentationPageSheet];

然后使用：

呈现它

[self.viewController presentModalViewController:floorView animated:YES];

然后，设置模型控制器的大小和位置，如下所示：

modelView.view.superview.bounds = CGRectMake(0, 0, 700, 550);//it's important to do this after presentModalViewController
modelView.view.superview.center = self.view.superview.center;//self.view assumes the base view is doing the launching, if not you might need self.view.superview.center etc.

希望这对你有所帮助。

iOS标签栏不显示模态视图

2 个答案: