[英]Swift UICollectionView in UITableViewCell not working
[英]Filtering the results on a UICollectionview in Swift 3 not working?
第一次加載itemlist可以正常工作,但是在過濾器之后,收集視圖不會更新。 我添加了一個搜索欄,並嘗試過濾結果,但UICollectionview無法更新視圖。
var resultSearchController = UISearchController()
//itemlist
var itemList = [item1, item2, item3, item4,..]
//configured searchbar
func viewDidLoad() {
self.resultSearchController = UISearchController(searchResultsController: nil)
self.resultSearchController.searchResultsUpdater = self
self.resultSearchController.searchBar.delegate = self
self.definesPresentationContext = true
self.resultSearchController.dimsBackgroundDuringPresentation = false
self.resultSearchController.searchBar.placeholder = "Search for Items"
self.resultSearchController.searchBar.searchBarStyle = UISearchBarStyle.prominent
self.resultSearchController.searchBar.sizeToFit()
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if resultSearchController.isActive {
return filterSearch.count
}
return itemList.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
var item = itemList()
if resultSearchController.isActive {
item = filterSearch[indexPath.row]
} else {
item = itemList[indexPath.row]
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellIdentifier", for: indexPath)
cell.titleLabel.text = item
return cell
}
//將項目過濾到filterSearch中,但集合視圖未根據filter更新。
func updateSearchResults(for searchController: UISearchController) {
filterSearch = itemList.filter { itemList in
return temList.name.lowercased().contains(searchText.lowercased())
}
self.collectionView?.reloadData()
}
檢查代碼中的以下更改
var resultSearchController = UISearchController()
//itemlist
var itemList = [item1, item2, item3, item4,..]
//configured searchbar
var issearchactive:Bool = false
func viewDidLoad() {
self.resultSearchController = UISearchController(searchResultsController: nil)
self.resultSearchController.searchResultsUpdater = self
self.resultSearchController.searchBar.delegate = self
self.definesPresentationContext = true
self.resultSearchController.dimsBackgroundDuringPresentation = false
self.resultSearchController.searchBar.placeholder = "Search for Items"
self.resultSearchController.searchBar.searchBarStyle = UISearchBarStyle.prominent
self.resultSearchController.searchBar.sizeToFit()
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if issearchactive {
return filterSearch.count
}
return itemList.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
var item = itemList()
if issearchactive {
item = filterSearch[indexPath.row]
} else {
item = itemList[indexPath.row]
}
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cellIdentifier", for: indexPath)
cell.titleLabel.text = item
return cell
}
func updateSearchResults(searchText:String) {
filterSearch = itemList.filter { obj in
return obj.name.lowercased().contains(searchText.lowercased())
}
self.collectionView?.reloadData()
}
override func textFieldShouldBeginEditing(_ textField: UITextField) -> Bool {
issearchactive = true
return true
}
override func textFieldDidEndEditing(_ textField: UITextField) {
updateSearchResults(searchText:textfield.text)
issearchactive = false
}
override func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
updateSearchResults(searchText:textfield.text)
return true
}
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