Question

我在HomeViewController的viewDidAppear()中将PageViewController添加为普通视图控制器，作为子视图，如下所示：

if showTutorial == false {
        addChild(controller)
        controller.view.frame = view.frame
        view.addSubview(controller.view)
        controller.didMove(toParent: self)
}

它可以工作，但是我不知道如何再次将其删除-PageViewController包含一个可浏览其页面的按钮。到达某个页面，我想通过单击PageViewController内部的按钮再次从HomeViewController中删除PageViewController。

我该怎么办？

PageViewController内部的按钮：

@objc func buttonAction(sender: UIButton!) {
    if currentTutorialPage != 4 {
        currentTutorialPage += 1
        self.setViewControllers([self.viewControllerList[currentTutorialPage]], direction: .forward, animated: false, completion: nil)
        view.bringSubviewToFront(nextButton)
        view.bringSubviewToFront(prevButton)
    } else {
        tutorialSeen = true
        defaults.set(tutorialSeen, forKey: "tutorialSeen")
    }
}

Answer 1

您可以尝试

self.view.removeFromSuperview()

出于完整性考虑，您可以使用此扩展名

@nonobjc extension UIViewController {
    func add(_ child: UIViewController, frame: CGRect? = nil) {
        addChild(child)
        if let frame = frame {
          child.view.frame = frame
        }
        view.addSubview(child.view)
        child.didMove(toParent: self)
    }
    func remove() {
        willMove(toParent: nil)
        view.removeFromSuperview()
        removeFromParent() 
    }
}

然后

@objc func buttonAction(sender: UIButton!) {
    if currentTutorialPage != 4 {
        currentTutorialPage += 1
        self.setViewControllers([self.viewControllerList[currentTutorialPage]], direction: .forward, animated: false, completion: nil)
        view.bringSubviewToFront(nextButton)
        view.bringSubviewToFront(prevButton)
    } else {
        tutorialSeen = true
        defaults.set(tutorialSeen, forKey: "tutorialSeen")
        self.remove()
    }
}

Answer 2

要删除子视图控制器（包括其视图），您应该：

willMove(toParent: nil)
view.removeFromSuperview()
removeFromParent()

Answer 3

您可以删除使用

从超级视图中输入文字/视图/警报/等

removeFromSuperview()

示例：

let loaderText = "text"

loaderText?.removeFromSuperview()

对于视图来说是相同的

let container: UIView = {
        let container = UIView(frame: CGRect.zero)
        container.backgroundColor = UIColor.black.withAlphaComponent(0.5)
        container.translatesAutoresizingMaskIntoConstraints = false
        return container
    }()

像这样

container.removeFromSuperview()

从另一个ViewController移除子视图

3 个答案: