ios - 点击 ParentViewController 关闭 ChildViewController

Question

我有一个 ViewController，它有添加按钮，该按钮将在屏幕右侧打开 SideBarVC。如果我再次点击主 ViewController 屏幕，它应该关闭我的 SideBarVC。

我试过了

@IBAction func click_leistung(_ sender: UIButton) {

    leistungList = self.storyboard?.instantiateViewController(withIdentifier: "leistungVC") as! leistungVC
    leistungList.view.backgroundColor = .clear
    leistungList.modalPresentationStyle = .overCurrentContext
         self.present(leistungList, animated: true, completion: nil)

}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {


    self.myscrollView.endEditing(false)
   leistungList.removeFromParentViewController()
    leistungList = nil
}

Answer 1

首先 - 你试图删除新的 VC，但你应该存储指向旧的 VC 的指针来删除它。创建 var 来存储指向此 leistungList 的指针，然后将其从父级中删除。

var storedController: UIViewController?
func show() {
    // ...
    storedController = presentedController
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {

    // Das keyboard ist weg
    self.myscrollView.endEditing(false)
    storedController.removeFromParentViewController()
    storedController = nil
}

PS:阅读本文以了解如何管理子 Controller https://developer.apple.com/library/content/featuredarticles/ViewControllerPGforiPhoneOS/ImplementingaContainerViewController.html