Question

我的应用程序我有以下代码，第一个位在我的应用程序启动时运行，它在模态视图中显示登录屏幕。在我之前将rootController添加到窗口中。

Modal视图将允许用户登录，查看条款和条件，然后如果他们接受，则调用loadMainApp函数。

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.
    rootController.delegate = self;
    [window addSubview:rootController.view];

    LoginViewController *_loginViewController = [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:[NSBundle mainBundle]];
    self.loginViewController = _loginViewController;
    [_loginViewController release];


    UINavigationController *navi = [[[UINavigationController alloc]initWithRootViewController:loginViewController]autorelease];

    navi.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
    [loginViewController release];
    [rootController presentModalViewController:navi animated:YES];

    [self.window makeKeyAndVisible];
    return YES;
}

当用户接受条款和条件时，将调用下一位：

-(void)loadMainApp:(UIView *)fromView{

    [fromView removeFromSuperview];
    [window addSubview:rootController.view];
    rootController.selectedIndex = 2;
    rootController.delegate = self;

}

从这里开始，我希望能够使用人物选择器，这是一个模态视图，我尝试使用此代码：

 ABPeoplePickerNavigationController *picker =
        [[ABPeoplePickerNavigationController alloc]init];
        picker.peoplePickerDelegate = self;

        [rootController presentModalViewController:picker animated:YES];
        [picker release];

但是没有任何反应，当我尝试从rootController呈现模态视图时，没有任何显示。

这似乎是在运行applicationDidFinishLaunching中的此代码之后发生的：

LoginViewController *_loginViewController = [[LoginViewController alloc] initWithNibName:@"LoginView" bundle:[NSBundle mainBundle]];
        self.loginViewController = _loginViewController;
        [_loginViewController release];


        UINavigationController *navi = [[[UINavigationController alloc]initWithRootViewController:loginViewController]autorelease];

        navi.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [loginViewController release];
        [rootController presentModalViewController:navi animated:YES];

        [self.window makeKeyAndVisible];
        return YES;

如果我根本不显示登录屏幕，而只是添加我的rootController

rootController.delegate = self;
        [window addSubview:rootController.view];

在applicationDidFinishLaunching函数中

，当我去显示人物选择器时，一切正常。

我有什么基本的东西在这里打破，或者有人能发现我可能做错了吗？

Answer 1

您是否通过dismissModalViewControllerAnimated:方法正确解雇了第一个模态视图控制器？如果您只是从超级视图中删除模态视图控制器的视图，那么UIKit可能会撤消大量文书工作。

Answer 2

你应该做的是这样的事情：

将rootViewController添加到navigationController。然后将navigationController添加到窗口。
在rootViewController的viewDidLoad方法中，将loginViewController的委托设置为rootViewController，并将LoginViewController的实例显示为模态。
完成条款验收后，请[委托loginViewControllerFinished];。
现在在rootViewController中，处理loginViewControllerFinished方法。这应该包含对[self dismissModalViewControllerAnimated：YES]的调用;关闭登录模式视图。然后你应该启动ABPeoplePickerNavigationController 作为模态视图。

在AppDelegate中：

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Make sure rootViewController is initiated by this point.

    UINavigationController *navigationController = [[[UINavigationController alloc] initWithRootViewController:rootViewController] autorelease];

    [window addSubview:rootController.view];
    [self.window makeKeyAndVisible];
    return YES;
}

在RootViewController中：

- (void)viewDidLoad {
  [super viewDidLoad];

  LoginViewController *loginViewController = [[[LoginViewController alloc] initWithNibName:@"LoginView" bundle:nil] autorelease];
  loginViewController.delegate = self;

  loginViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
  [self presentModalViewController:loginViewController animated:YES];
}

- (void)loginViewControllerFinished {
  [self dismissModalViewControllerAnimated:YES];

  // Here we are closing one modal. And showing another after that.
  ABPeoplePickerNavigationController *peoplePicker = [[[ABPeoplePickerNavigationController alloc] init] autorelease];
  peoplePicker.peoplePickerDelegate = self;
  [self presentModalViewController:peoplePicker animated:YES];
}

在LoginViewController中：

// Make sure LoginViewController has delegate property in header.
// @property (nonatomic, assign) id delegate;
// And put this in implementation (.m) file. @synthesize delegate.
// Don't put release for delegate, since it's not retained. It's only 'assigned'.

- (void)done {
  // Call this when you want to close loginViewController.
  [delegate loginViewControllerFinished];
}

希望这有帮助。

iphone - 在向窗口添加子视图后无法推送模态视图？

2 个答案: