Question

在我的应用中，我多次使用相同的底部工具栏。所以我创建了新的UITollbar类，其中包含4个UIBarButtonItems。如何编写它们来呈现另一个viewcontroller？我不想每次都这样做，当我创建新的视图控制器时，所以我更喜欢这样做一次并将这个类用于每个相同的tooolbars。例如，这是我对所有按钮的操作：

- (void)actionButtonTapped:(UIBarButtonItem*)barButtonItem {

    switch (barButtonItem.tag) {
        case BacklogButton:
            break;

        case MyTicketsButton:
            break;

        case FilterButton:
            break;

        case ProjectsButton:
            break;
    }
}

它很好用，但是对于使用presentViewController，我必须在UIViewController类中。我需要你的帮助。

UPD。我为你们写了一些代码来解释我的问题。

- (void)actionButtonTapped:(UIBarButtonItem*)barButtonItem {

    switch (barButtonItem.tag) {
        case BacklogButton:
            [self presentViewControllerFromStoryBoardName:@"TRBacklogViewController"];
            break;

        case MyTicketsButton:
            [self presentViewControllerFromStoryBoardName:@"TRMyTicketsViewController"];
            break;

        case FilterButton:
            [self presentViewControllerFromStoryBoardName:@"TRFilterViewController"];
            break;

        case ProjectsButton:
            [self presentViewControllerFromStoryBoardName:@"TRProjectsViewController"];
            break;
    }
}

- (void)presentViewControllerFromStoryBoardName:(NSString*)storyboardName {

    [[UIApplication sharedApplication].delegate.window.rootViewController presentViewController:[self viewControlerFromStoribordName:storyboardName] animated:YES completion:^{
    }];
}

- (UIViewController*)viewControlerFromStoribordName:(NSString*)storyboardName {

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle:nil];
    return (UIViewController*)[storyboard instantiateInitialViewController];
}

问题是 - 我不止这么做了。按钮上的其他点击失败，错误：＆＃34;尝试在<UINavigationController: 0x7ab0cc00>上显示<UINavigationController: 0x7c304600>，其视图不在窗口层次结构中！＆＃34;有没有办法使用pushViewController？

Answer 1

如果你只是想呈现一个vc，你可以在窗口的rootvc上做这个。

        [[UIApplication sharedApplication].delegate.window.rootViewController presentViewController:vc animated:NO completion:^{
    }];

我希望能帮到你！

Answer 2

试试这个：

   UIViewController *vc = [[[[UIApplication sharedApplication] delegate] window] rootViewController];

 [[vc presentedViewController] ? vc.presentedViewController : vc presentViewController:alert animated:YES completion:nil];

Answer 3

使用以下代码，我希望这对您有帮助。

UIStoryboard* storyboard = [UIStoryboard storyboardWithName:@"NameOfYourStoryBoard" bundle:nil];
YourViewController *yourVC =  [storyboard instantiateViewControllerWithIdentifier:@"viewControllerIdentifier"];
[self presentViewController:yourVC animated:YES completion:nil];

Answer 4

我已更新您的代码。

- (void)actionButtonTapped:(UIBarButtonItem*)barButtonItem {

    switch (barButtonItem.tag) {
    case BacklogButton:
        [self presentViewControllerFromStoryBoardName:@"TRBacklogViewController"];
   // @"TRBacklogViewController" I think its your View controller Identifier not a storyboard name
        break;

    case MyTicketsButton:
        [self presentViewControllerFromStoryBoardName:@"TRMyTicketsViewController"];
        break;

    case FilterButton:
        [self presentViewControllerFromStoryBoardName:@"TRFilterViewController"];
        break;

    case ProjectsButton:
        [self presentViewControllerFromStoryBoardName:@"TRProjectsViewController"];
        break;
    }
}

- (void)presentViewControllerFromStoryBoardName:(NSString*)storyboardName {

[[UIApplication sharedApplication].delegate.window.rootViewController presentViewController:[self viewControlerFromStoribordName:storyboardName] animated:YES completion:^{
  }];
}

 - (UIViewController*)viewControlerFromStoribordName:(NSString*)storyboardName {

    UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil];
// May be "Main" is your storyboard name
     return (UIViewController*)[storyboard instantiateViewControllerWithIdentifier:storyboardName];
  // Use object name "viewcontrollerIdentifier" instead of "storyboardName"

 }

从自定义工具栏呈现viewcontroller

4 个答案: