- 移除子视图
- 视图更新
- 防止鬼影(逃)
if self.children.count > 0{
let viewControllers:[UIViewController] = self.children
for viewContoller in viewControllers{
viewContoller.willMove(toParent: nil)
viewContoller.view.removeFromSuperview()
viewContoller.removeFromParent()
}
}
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