带Tabbar的页面上push一个viewController，再pop回来原页面会跳动。
注意viewController.hidesBottomBarWhenPushed = true
push代码.png
演示.gif
解决方案很简单
override func viewDidLayoutSubviews() {
if #available(iOS 11.0, *) {
let height = self.view.safeAreaInsets.bottom
self.collectionView.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height - height)
} else {
// Fallback on earlier versions
}
}
复写viewDidLayoutSubviews，利用safeAreaInsets设置frame就行啦。
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