当没有呈现searchController时,3d touch按预期工作并调用委托方法.但是当searchController处于活动状态时不会调用.
UISearchController的创建看起来像这样
let searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.delegate = self
searchController.hidesNavigationBarDuringPresentation = false
searchController.dimsBackgroundDuringPresentation = false
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