如何将数据从UIViewController传递到UITabBarController？-Java 学习之路

在UIViewController中：

class ViewController2: UIViewController {

    var points = 0

    var pressed = false

    @IBOutlet weak var label: UILabel!

    @IBAction func slider(_ sender: UISlider) {
        number = Int(sender.value)
        label.text = String(number)
    }

    @IBAction func submitbutton(_ sender: UIButton) {
        pressed = true
    }
}

如果按下UIViewController中的按钮，我试图在TabBarController中执行某些操作，并在另一个TabBarConroller中为该数字添加一个数字 .

Image 1: This shows the connection between my ViewControllers.

Image 2: This shows the first two ViewControllers.)

Image 3: This shows the third and fourth ViewController

这是我的故事板 . 我用几句话来描述我在图像中想要做的事情 . 如果您需要更清楚的描述，请告诉我 . 谢谢！

3 回答

在你的 TabBarController 类中，取一个变量说 variableToBeSet

class TabBarController: UITabBarController
{
    var variableToBeSet: Int = 0    // This is just an example. You can change it as per requirement.
    // Rest of class implementation
}

现在在你的 ViewController ：

@IBAction func submitbutton(_ sender: UIButton) {
    pressed = true
    let tabControllerInstance = self.tabBarController as! TabBarController
    tabControllerInstance.variableToBeSet = localVariable    // The value which you want to assign
}

回复于 2024-05-04T18:30:24+08:00

如果 ViewController 是您要访问的 UITabBarController 的子项，则只需使用 UIViewController 的 tabBarController 属性，例如，使用此属性将所选控制器更改为第一个：

@IBAction func submitbutton(_ sender: UIButton) {
    pressed = true

    self.tabBarController?.selectedIndex = 0
}

所以，假设你有一个自定义 UITabBarController 子类，例如：

class CustomTabBarController: UITabBarController {


    func acceptData(points: Int) {
        print(">>> Accepted: \(points)")
        // or do anything you need to do with it
    }
}

然后您可以按如下方式传递数据：

@IBAction func submitbutton(_ sender: UIButton) {
    pressed = true
    if let customTabController = self.tabBarController as? CustomTabBarController {
        customTabController.acceptData(points: self.points)
    }
}

UPDATE

由于当前VC似乎是由tabBarController子控制器之一呈现的，因此您必须通过 self.presentingViewController 访问它：

@IBAction func submitbutton(_ sender: UIButton) {
    pressed = true
    if let customTabController = self.presentingViewController?.tabBarController as? CustomTabBarController {
        customTabController.acceptData(points: self.points)
    }
}

UPDATE 2

您的屏幕截图质量很差，您对问题的解释也需要澄清，因为您很难理解您尝试做什么 . 所以在评论中的整个讨论之后我想这就是它：

@IBAction func submitbutton(_ sender: UIButton) {
    pressed = true
    if let tabController = self.presentingViewController?.tabBarController,
        let viewController3 = tabController.viewControllers?.filter({ $0 is ViewController3 }).first {

        viewController3.acceptData(points: self.points)
    }
}

回复于 2024-05-04T18:30:24+08:00

您可以正常传递数据

let vc:HomeVC = ApiUtillity.sharedInstance.getCurrentLanguageStoryboard().instantiateViewController(withIdentifier: "HomeVC") as! HomeVC
   vc.tempCategoryArray = CategoryArray
   self.navigationController?.pushViewController(vc, animated: true)

回复于 2024-05-04T18:30:24+08:00

如何将数据从UIViewController传递到UITabBarController？

3 回答

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