Ios 调用removeFromSuperView（）后，子视图（nib）不会删除

我有一个用于隔离内容的覆盖视图，我正在ViewWillAspect（）中检查身份验证，并且我的Auth方法已订阅通知。如果我在任何其他视图出现之前进行身份验证，则覆盖不会显示，但它会在第一个视图上显示，并且即使在调用removeFromSuperView（）后也不会消失

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这是因为您每次都试图删除一个新的

ForceSignInBanner

。理想情况下，您应该创建一次，并保留对所创建的

ForceSignInBanner

的引用（作为

ProtectedViewController

的可选属性）

然后删除存储在属性中的

ForceSignInBanner

    class ProtectedViewController: UIViewController, ForceSignInBannerDelegate {

        // This lazily loads the view when the property is first used and sets the delegate.
        // Ideally you wouldn't force-case the `as` but I've left it for simplicity here.

        private lazy var forceSignInBannerView: ForceSignInBanner = {
            let forceSignInBannerView  = ForceSignInBanner.instanceFromNib() as! ForceSignInBanner
            forceSignInBannerView.delegate = self
            return forceSignInBannerView
        }()

        // ... your other code ... //

        fun toggleForceSignInBannerViewVisibility(isVisible: Bool) {
            if isVisible {
                view.addSubview(forceSignInBannerView)
            } else {
                forceSignInBannerView.removeFromSuperview()
            }
        }

    }

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谢谢你，我不知怎么搞明白了，我也会试试你的实现。

    class ProtectedViewController: UIViewController, ForceSignInBannerDelegate {

        // This lazily loads the view when the property is first used and sets the delegate.
        // Ideally you wouldn't force-case the `as` but I've left it for simplicity here.

        private lazy var forceSignInBannerView: ForceSignInBanner = {
            let forceSignInBannerView  = ForceSignInBanner.instanceFromNib() as! ForceSignInBanner
            forceSignInBannerView.delegate = self
            return forceSignInBannerView
        }()

        // ... your other code ... //

        fun toggleForceSignInBannerViewVisibility(isVisible: Bool) {
            if isVisible {
                view.addSubview(forceSignInBannerView)
            } else {
                forceSignInBannerView.removeFromSuperview()
            }
        }

    }