搜索栏未显示在导航栏iOS 11上

Question

I am pushing a viewController where I want a searchBar, but search bar is not showing at all. Below is the code. Am I missing something?

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

You need to add this line to your code:

navigationItem.hidesSearchBarWhenScrolling = false

That removes hiding searchBar while scrolling and shows it on pushing your view controller.

Answer 2

所以， navigationItem.hidesSearchWhenScrolling只有当您设置工作searchController财产navigationItem不是当你设置navigationItem.titleView到searchBar 。