搜索栏未显示在导航栏iOS 11上

Question

我正在推动一个viewController,我想要一个searchBar,但搜索栏根本没有显示.下面是代码.我错过了什么吗？

var searchController = UISearchController(searchResultsController: nil)
searchController.searchResultsUpdater = self
searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search here..."
definesPresentationContext = true
searchController.searchBar.delegate = self
searchController.searchBar.sizeToFit()
if #available(iOS 11.0, *) {

    self.navigationItem.searchController = searchController
} else {
    // Fallback on earlier versions
    navigationItem.titleView = searchController.searchBar
    navigationItem.titleView?.layoutSubviews()
}

Answer 1

您需要将此行添加到代码中：

navigationItem.hidesSearchBarWhenScrolling = false

这样可以在滚动时删除隐藏的searchBar，并在按下视图控制器时显示它。