ios - 将数据从一个 Tabbar VC 传递到另一个 Tabbar VC 而不会丢失 Tabbar

Question

我想将照片数据从 Tabbarcontroller 中的一个 Viewcontroller(cameraVC) 传递到同一 Tabbarcontroller 中的另一个 Viewcontroller(mainVC) 在执行转场后不会丢失选项卡栏。

设置:*标签栏 Controller

      -Navbarcontroller
      --mainVC (Tabbar Item)
      --cameraVC (Tabbar Item)

我必须能够在cameraVC中使用prepareForSegue和performSegue(这就是我将数据传递给mainVC的方式)。

我尝试过但没有成功: Keeping tab bar on View after segue? , Why TabBar hides after the segue?

当前实现:

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    let destinationNavigationController = segue.destination as! UINavigationController
    let targetController = destinationNavigationController.topViewController as! HomeVC

   // if let homeVC = segue.destination as? HomeVC {
       if let imageDict = sender as? Dictionary<String, Any> {
            let imageData = imageDict["snapshotData"]
            targetController.imageData = imageData as? Data

      // }
    }
}

@IBAction func sendBtnPressed(_ sender: Any) {

   performSegue(withIdentifier: "goFeed", sender: ["snapshotData": photoData.removeValue(forKey: "photoData")])

    imageTaken.image = nil
    self.view.insertSubview(previewView, aboveSubview: imageView)
}

Answer 1

您错误地使用了 performSegue(_:, sender:) 方法的 sender 参数。它应该是 View Controller 启动segue。看起来您的 photoData 属性属于启动 segue 的 View Controller ，因此只需在 prepareForSegue 方法中直接访问它即可。所以它看起来像这样:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    let destinationNavigationController = segue.destination as! UINavigationController
    let targetController = destinationNavigationController.topViewController as! HomeVC

    if let imageData: Data = self.photoData["photoData"] as? Data {
        targetController.imageData = imageData
    }
}

@IBAction func sendBtnPressed(_ sender: Any) {

   performSegue(withIdentifier: "goFeed", sender: self)

    imageTaken.image = nil
    self.view.insertSubview(previewView, aboveSubview: imageView)
}