There are still cases where the HUD is not displayed.

[hubin97]

Similar to #812

This situation still exists when using pod 'SVProgressHUD', '~> 2.3.1'. It cannot be said to be a problem, but it can only be said to be related to the mechanism;
The SVProgressHUD.setContainerView method globally modifies the displayed container. This is how I handle it. After the page using SVProgressHUD.setContainerView is destroyed, I call SVProgressHUD.setContainerView(nil) again.

     /// Device connection animation
     static func cnctAnimate(content: String = "Connecting".localized, forView: UIView? = nil) {
         SVProgressHUD.setMinimumSize(CGSize(width: 200, height: 100))
         SVProgressHUD.setDefaultStyle(.custom)
         SVProgressHUD.setBackgroundColor(.systemGroupedBackground)
         SVProgressHUD.setForegroundColor(.black)
         SVProgressHUD.setDefaultMaskType(.black)
         SVProgressHUD.show(withStatus: content)
         if let view = forView {
             SVProgressHUD.setContainerView(view)
             SVProgressHUD.setOffsetFromCenter(UIOffset(horizontal: -view.origin.x, vertical: -view.origin.y - kNavBarAndSafeHeight/2))
         }
     }
    
     // FIXME: There is a problem with the use of setContainerView. It must be restored after use, otherwise the prompt added to the window will not be displayed.
     static func dismissAnimate() {
         SVProgressHUD.setContainerView(nil)
         SVProgressHUD.setOffsetFromCenter(UIOffset.zero)
     }

---

使用pod 'SVProgressHUD', '~> 2.3.1'还是存在这个情况, 不能说是问题, 只能说和机制相关;
SVProgressHUD.setContainerView 方法是全局修改了展示的容器, 我是这么处理的, 在使用完SVProgressHUD.setContainerView的页面销毁后, 再调用 SVProgressHUD.setContainerView(nil),

    /// 设备连接动画
    static func cnctAnimate(content: String = "Connecting".localized, forView: UIView? = nil) {
        SVProgressHUD.setMinimumSize(CGSize(width: 200, height: 100))
        SVProgressHUD.setDefaultStyle(.custom)
        SVProgressHUD.setBackgroundColor(.systemGroupedBackground)
        SVProgressHUD.setForegroundColor(.black)
        SVProgressHUD.setDefaultMaskType(.black)
        SVProgressHUD.show(withStatus: content)
        if let view = forView {
            SVProgressHUD.setContainerView(view)
            SVProgressHUD.setOffsetFromCenter(UIOffset(horizontal: -view.origin.x, vertical: -view.origin.y - kNavBarAndSafeHeight/2))
        }
    }
    
    // FIXME: setContainerView使用存在问题, 使用后得还原, 否则会使加在window的提示不显示
    static func dismissAnimate() {
        SVProgressHUD.setContainerView(nil)
        SVProgressHUD.setOffsetFromCenter(UIOffset.zero)
    }

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