Question

在我的应用程序中，我有UITabBarController，其中放置了UIContainerView，以便在其中显示一组不同的页面。

默认情况下，屏幕1从一开始就使用情节提要板加载到该容器中。以下是添加UIViewControllers到容器视图并在添加新容器时删除的代码：

@objc func switchContainerViewContent() {

    switch viewControllerId {
    case "1":

        guard let childVC = self.storyboard?.instantiateViewController(withIdentifier: "MedicalInsurancePolicyScreen") as? MedicalInsuranceScreenViewController else {
            return
        }

        self.add(childVC, frame: self.containerView.frame)
    case "2":

        guard let childVC = self.storyboard?.instantiateViewController(withIdentifier: "HouseInsurancePolicyScreen") as? HouseInsuranceScreenViewController else {
            return
        }

        self.add(childVC, frame: self.containerView.frame)
    case "3":

        guard let childVC = self.storyboard?.instantiateViewController(withIdentifier: "CarInsurancePolicyScreen") as? CarInsuranceScreenViewController else {
            return
        }

        self.add(childVC, frame: self.containerView.frame)
    default:
        break
    }
}

@objc func removePreviousChildViewContent() {

    switch viewControllerId {
    case "1":

        guard let childVC = self.storyboard?.instantiateViewController(withIdentifier: "MedicalInsurancePolicyScreen") as? MedicalInsuranceScreenViewController else {
            return
        }

        childVC.remove()
    case "2":

        guard let childVC = self.storyboard?.instantiateViewController(withIdentifier: "HouseInsurancePolicyScreen") as? HouseInsuranceScreenViewController else {
            return
        }

        childVC.remove()
    case "3":

        guard let childVC = self.storyboard?.instantiateViewController(withIdentifier: "CarInsurancePolicyScreen") as? CarInsuranceScreenViewController else {
            return
        }

        childVC.remove()
    default:
        break
    }
}

在此处添加和删除func本身：

func add(_ child: UIViewController, frame: CGRect? = nil) {

    addChildViewController(child)
    if let frame = frame {
        child.view.frame = frame
    }
    view.addSubview(child.view)
    child.didMove(toParentViewController: self)
}

func remove() {

    willMove(toParentViewController: nil)
    view.removeFromSuperview()
    removeFromParentViewController()
}

这是用于处理容器内内容切换的集合视图：

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {

    selectedPolicyIndex = indexPath

    guard let cell = collectionView.cellForItem(at: selectedPolicyIndex) as? PoliciesCell else { return }

    cell.selectionView.isHidden = false
    cell.policyNumber.isHidden = true
    cell.policyName.isHidden = true

    collectionView.reloadData()
    NotificationCenter.default.post(name: NSNotification.Name(rawValue: "removePreviousPolicy"), object: nil)

    switch indexPath.item {
    case 0:
        viewControllerId = "1"
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "switchPolicies"), object: nil)
    case 1:
        viewControllerId = "2"
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "switchPolicies"), object: nil)
    case 2:
        viewControllerId = "3"
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "switchPolicies"), object: nil)
    default:
        break
    }
}

在TabBar中从一个选项卡切换到另一个选项卡时，出现错误。由于某种原因，我的容器会记住该容器中显示的所有屏幕，并在我再次打开该标签页时依次加载它们。

更具体地说，会发生以下情况：

用户进入带有容器的标签并在不同屏幕之间切换，打开屏幕1、3、2和1。
此后，他转到其他选项卡，并出于某种原因返回该选项卡后，容器视图开始加载他之前打开的1、3、2和1屏幕。

执行10-15次此操作后，所有这些都会导致内存使用率增加。

我做错了什么？

标签栏控制器内的容器视图内存泄漏

0 个答案: