问题描述
我在屏幕顶部有2个标签。每个页面都包含collectionView。而且我必须在collectionView的顶部创建一个searchBar。我希望它在Settings App中看起来像（向下滚动时显示，向上滚动时消失）。 这是我用于搜索组件的代码。但是由于我在页面内没有NavigationBar，所以它没有显示。
请帮助我在tabBar和collectionView之间进行搜索。
import UIKit
class ViewController: UIViewController,UICollectionViewDataSource,UICollectionViewDelegate,UISearchControllerDelegate,UISearchBarDelegate,UISearchResultsUpdating {
var filtered:[String] = []
var searchActive : Bool = false
let searchController = UISearchController(searchResultsController: nil)
@IBOutlet weak var collectionView: UICollectionView!
var items = ["Apple","Orange","Apple","Orange"]
override func viewDidLoad() {
super.viewDidLoad()
collectionView.delegate = self
collectionView.dataSource = self
self.searchController.searchResultsUpdater = self
self.searchController.delegate = self
self.searchController.searchBar.delegate = self
self.searchController.hidesNavigationBarDuringPresentation = false
self.searchController.dimsBackgroundDuringPresentation = true
self.searchController.obscuresBackgroundDuringPresentation = false
searchController.searchBar.placeholder = "Search..."
searchController.searchBar.sizetoFit()
searchController.searchBar.becomeFirstResponder()
self.navigationItem.titleView = searchController.searchBar
self.definesPresentationContext = true
self.searchController.searchBar.placeholder = "Search for Items"
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func collectionView(_ collectionView: UICollectionView,numberOfItemsInSection section: Int) -> Int {
if searchActive {
return filtered.count
}
else
{
return items.count
}
}
func collectionView(_ collectionView: UICollectionView,cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell",for: indexPath) as! CollectionViewCell
cell.contentView.layer.cornerRadius = 7.0
cell.contentView.layer.borderWidth = 1.0
cell.contentView.layer.borderColor = UIColor.clear.cgColor
cell.contentView.layer.masksToBounds = false
cell.layer.cornerRadius = 7.0
return cell
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
searchActive = false
self.@R_502_6422@miss(animated: true,completion: nil)
}
func updateSearchResults(for searchController: UISearchController)
{
let searchString = searchController.searchBar.text
filtered = items.filter({ (item) -> Bool in
let countryText: Nsstring = item as Nsstring
return (countryText.range(of: searchString!,options: Nsstring.CompareOptions.caseInsensitive).location) != NSNotFound
})
collectionView.reloadData()
}
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
searchActive = true
collectionView.reloadData()
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
searchActive = false
collectionView.reloadData()
}
func searchBarBookmarkButtonClicked(_ searchBar: UISearchBar) {
if !searchActive {
searchActive = true
collectionView.reloadData()
}
searchController.searchBar.resignFirstResponder()
}
}
解决方法
我也遇到了同样的问题，创建UISerchBar而不是UISearchController是实现目标的最佳方法。
下面是将UISearchBar设置为与UISearchBarController完全一样的功能的示例：
设置SearchBar
let searchBar: UISearchBar = {
let searchBar = UISearchBar()
searchBar.tintColor = UIColor.black.withAlphaComponent(1.0)
searchBar.placeholder = "Search for exercise"
searchBar.backgroundColor = UIColor.clear
searchBar.barTintColor = UIColor.clear
searchBar.searchBarStyle = .minimal
searchBar.returnKeyType = .search
searchBar.showsCancelButton = false
searchBar.showsBookmarkButton = false
searchBar.sizeToFit()
return searchBar
}()
设置其委托，也不要忘记将definePresentationContext设置为false，否则将不会出现searchBar
searchBar.delegate =自我 self.definesPresentationContext = false
searchBar的自定义功能 在这里，我们要设置SearchBar的行为
extension YourViewController: UISearchBarDelegate {
func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {
searchActive = true
self.searchBar.showsCancelButton = true
self.collectionView.reloadData()
}
func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
self.searchBar.text = ""
self.filtered = []
searchActive = false
self.searchBar.showsCancelButton = false
self.searchBar.endEditing(true)
self.dismiss(animated: true,completion: nil)
self.collectionView.reloadData()
}
func searchBar(_ searchBar: UISearchBar,textDidChange searchText: String) {
if searchBar.text! == " " {
filtered = exercises
collectionView.reloadData()
} else {
filtered = exercises.filter({ (item) -> Bool in
return (item.exerciseNameLabel?.localizedCaseInsensitiveContains(String(searchBar.text!)))!
})
collectionView.reloadData()
}
}
func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
collectionView.reloadData()
}
}
我希望它能帮助您解决问题：）