如何在Swift iOS开发中从一个视图控制器到另一个容器视图控制器获取分段控制索引？

Question

我在命名为仪表板控制器的视图控制器之一中使用三个索引分段控件，并将segue传递到容器视图以在仪表板控制器中加载三个不同的视图控制器，但所选索引仍显示分段控件，但容器视图正在加载仪表板控制器下的默认第一视图控制器。

Answer 1

You can go through with this link and it will help you with your problem.

http://codingdiscovery.blogspot.com/2015/03/swap-viewcontrollers-with-segmented.html

![And fill in the functionality of the value changed method to hide/show the blue container based on the segment index: ] 1

Answer 2

Here's how I do it.

• Don't link the segmented control to a segue directly, but to an action in the dashboard controller .
• Swap out the views from the dashboard controller.

---

func switchViews(_ sender: Any?) {
    // vcSelector is an instance variable, or you can use the sender
    let subVCIndex = vcSelector?.selectedSegmentIndex
    // also an instance variable
    currentViewController = nil
    switch subVCIndex {
        case 0:
            currentViewController = self.storyboard!.instantiateViewController(withIdentifier: "SubControllerA")
            // set up for case 0
        case 1:
            currentViewController = self.storyboard!.instantiateViewController(withIdentifier: "SubControllerB")
            // set up for case 1
        // ...
        default:
            // should never happen
            NSLog("*** Invalid view mode! ***")
            return // bail out
    }

    // add the new view controller
    self.addChildViewController(currentViewController!)

    // take out all the old subviews
    for subview in self.containerView!.subviews {
        subview.removeFromSuperview()
    }

    // install the new subVC's view
    self.containerView?.addSubview(currentViewController!.view)
    currentViewController!.view.frame = self.containerView!.bounds
}